<SEC-DOCUMENT>0001493152-21-005464.txt : 20210305
<SEC-HEADER>0001493152-21-005464.hdr.sgml : 20210305
<ACCEPTANCE-DATETIME>20210305160035
ACCESSION NUMBER:		0001493152-21-005464
CONFORMED SUBMISSION TYPE:	10-Q
PUBLIC DOCUMENT COUNT:		83
CONFORMED PERIOD OF REPORT:	20210131
FILED AS OF DATE:		20210305
DATE AS OF CHANGE:		20210305

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:		21718422

	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>
<DOCUMENT>
<TYPE>10-Q
<SEQUENCE>1
<FILENAME>form10-q.htm
<TEXT>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>&nbsp;</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>UNITED
STATES </B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>SECURITIES
AND EXCHANGE COMMISSION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 12pt"><B>Washington,
D.C. 20549</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>Form
10-Q</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Mark
One)</FONT></P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">[X]</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.35in"><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"><B>QUARTERLY
    REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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: 0 0 0 2in; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>For
the Quarterly Period Ended January 31, 2021</B></FONT></P>

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

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

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<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">[&nbsp;&nbsp;]</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.35in"><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"><B>TRANSITION
    REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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: 0 0 0 1.5in; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>For
the Transition Period From __________ to ___________</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Commission
file number: 001-33417</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>OCEAN
POWER TECHNOLOGIES, INC.</B></FONT></P>

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

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

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<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 49%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Delaware</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 49%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>22-2535818</B></FONT></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: center"><P STYLE="margin-top: 0; margin-bottom: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>(State
or Other Jurisdiction</I></FONT></P>
                                                                                                  <P STYLE="margin-top: 0; margin-bottom: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><I>of Incorporation or Organization)</I></FONT></P></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: center"><P STYLE="margin-top: 0; margin-bottom: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>(I.R.S. Employer</I></FONT></P>
                                                                                <P STYLE="margin-top: 0; margin-bottom: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><I>Identification No.)</I></FONT></P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>28
ENGELHARD DRIVE, SUITE B, MONROE TOWNSHIP, NJ 08831</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>(Address
of Principal Executive Offices, Including Zip Code)</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(609)
730-0400</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>(Registrant&rsquo;s
Telephone Number, Including Area Code)</I></FONT></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><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="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 34%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Title
    of each class</FONT></TD>
    <TD STYLE="padding-bottom: 1.5pt; width: 2%">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 18%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Trading
    Symbol(s)</FONT></TD>
    <TD STYLE="padding-bottom: 1.5pt; width: 2%">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; width: 44%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Name
    of each exchange on which registered</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Common
    Stock $0.001 par value</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">OPTT</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nasdaq
    Capital Market</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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. Yes [X]  No [&nbsp;&nbsp;]</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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 (&sect;232.405 of this chapter) during the preceding 12 months (or for such shorter period that
the registrant was required to submit such files). Yes [X]  No [&nbsp;&nbsp;]</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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 &ldquo;large accelerated filer,&rdquo; &ldquo;accelerated filer,&rdquo;
&ldquo;smaller reporting company&rdquo; and &ldquo;emerging growth company&rdquo; in Rule 12b-2 of the Exchange Act. (Check one):</FONT></P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 24%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Large
    accelerated filer [&nbsp;&nbsp;]</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 22%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accelerated
    filer [&nbsp;&nbsp;]</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 24%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Non-accelerated
    filer [&nbsp;&nbsp;]</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 30%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Smaller
    reporting company [X]</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Emerging
growth company [&nbsp;&nbsp;]</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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 [&nbsp;&nbsp;] No&nbsp;[X]</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT 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.
[&nbsp;&nbsp;]</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of March 3, 2021, the number of outstanding shares of common stock of the registrant was 50,985,760.</FONT></P>

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

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

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>OCEAN
POWER TECHNOLOGIES, INC.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>INDEX
TO FORM 10-Q</B></FONT></P>

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

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    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.1in"><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: center; width: 0.75in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Page</B></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">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Number</B></FONT></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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A HREF="#ar_001">PART I &mdash; FINANCIAL INFORMATION</A></B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; 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: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#ar_002">Item 1. Financial Statements:</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><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; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-left: 20pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#ar_003">Consolidated Balance Sheets as of January 31, 2021 (unaudited) and April 30, 2020</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2</FONT></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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#ar_004">Unaudited Consolidated Statements of Operations for the three and nine months ended January 31, 2021 and 2020</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3</FONT></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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#ar_005">Unaudited Consolidated Statements of Comprehensive Loss for the three and nine months ended January 31, 2021 and 2020</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4</FONT></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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#ar_006">Unaudited Consolidated Statement of Stockholders&rsquo; Equity for the three and nine months ended January 31, 2021 and 2020</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#ar_007">Unaudited Consolidated Statements of Cash Flows for the nine months ended January 31, 2021 and 2020</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">7</FONT></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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center">&nbsp;</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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#ar_008">Notes to Unaudited Consolidated Financial Statements</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">8</FONT></P></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_001">Item 2. Management&rsquo;s Discussion and Analysis of Financial Condition and Results of Operations</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">24</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_002">Item 3. Quantitative and Qualitative Disclosures About Market Risk</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center">41</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_003">Item 4. Controls and Procedures</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">41</FONT></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"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A HREF="#pri_004">PART II &mdash; OTHER INFORMATION</A></B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; 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: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_005">Item 1. Legal Proceedings</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">42</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_006">Item 1A. Risk Factors</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">42</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_007">Item 2. Unregistered Sales of Equity Securities and Use of Proceeds</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">44</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_008">Item 3. Defaults Upon Senior Securities</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center">44</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_009">Item 4. Mine Safety Disclosures</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center">44</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_010">Item 5. Other Information</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">44</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="#pri_011">Item 6. Exhibits</A></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">45</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">PowerBuoy&reg;
trademark and the Ocean Power Technologies and 3dent logos are property of Ocean Power Technologies, Inc.
All other trademarks appearing in this report are the property of their respective holders.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Special
Note Regarding Forward-Looking Statements</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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: 0; text-align: justify"><FONT 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
&ldquo;may,&rdquo; &ldquo;continue,&rdquo; &ldquo;estimate,&rdquo; &ldquo;intend,&rdquo; &ldquo;plan,&rdquo; &ldquo;will,&rdquo;
&ldquo;believe,&rdquo; &ldquo;project,&rdquo; &ldquo;expect,&rdquo; &ldquo;anticipate&rdquo;, 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.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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 a number of risks and uncertainties that are beyond our control, including:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"><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: 0.75in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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
    impact of the COVID-19 pandemic on our business, operations, customers, suppliers and manufacturers;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to commercialize our products, and achieve and sustain profitability;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">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;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to obtain additional funding, as and if needed which will be subject to a number of factors, including market conditions,
    and our operating performance;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to continue as a going concern;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to successfully integrate acquisitions, including our recent acquisition of 3dent Technology, LLC;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    estimates regarding expenses, future revenues and capital requirements;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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
    adequacy of our cash balances and our need for additional financings;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to develop and manufacture commercially viable products;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to successfully develop and market new products and solutions, such as the subsea battery and Marine Surveillance
    Solution;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">that
    we will be successful in our efforts to commercialize our products or the timetable upon which commercialization can be achieved,
    if at all;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to identify and penetrate markets for our products and solutions;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to implement our commercialization strategy as planned, or at all;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to improve the power output, survivability and reliability of our products;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    relationships with our strategic partners may not be successful and we may not be successful in establishing additional relationships;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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
    reliability of our technology, products and solutions;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to raise capital through our current equity facilities;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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
    impact of pending and threatened litigation on our business, financial condition and liquidity;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">changes
    in current legislation, regulations and economic conditions that affect the demand for renewable energy;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to compete effectively in our target markets;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    limited operating history and history of operating losses;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    sales and marketing capabilities and strategy in the United States and internationally; 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"><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">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</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">our
    ability to protect our intellectual property portfolio.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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 &ldquo;Risk Factors&rdquo;
of our Annual Report on Form 10-K for the year ended April 30, 2020, 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.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A NAME="ar_001">PART
I &mdash; FINANCIAL INFORMATION</A></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A NAME="ar_002"></A>Item
1. Financial Statements</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A NAME="ar_003"></A>Ocean
Power Technologies, Inc. and Subsidiaries</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(in
$000&rsquo;s, except share data)</B></FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center">April 30, 2020</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">(Unaudited)</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: center">ASSETS</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Current assets:</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; width: 60%; text-align: left">Cash and cash equivalents</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">79,801</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">10,002</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Restricted cash, short-term</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">384</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">707</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">Accounts receivable</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">105</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Contract assets</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">63</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">251</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt; padding-left: 10pt; text-align: left">Other current assets</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">1,001</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">588</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 20pt; text-align: left">Total current assets</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">81,249</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">11,653</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Property and equipment, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">417</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">499</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Right-of-use asset, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,005</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,165</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">Restricted cash, long-term</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">222</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">221</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt; padding-left: 20pt; text-align: left">Total assets</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">82,893</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">13,538</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: center">LIABILITIES AND STOCKHOLDERS&rsquo; EQUITY</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Current liabilities:</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">Loan payable</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">175</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Accounts payable</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">74</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">220</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">Accrued expenses</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2,340</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,353</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Contract liabilities, current portion</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">75</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">100</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">Right-of-use liability, current portion</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">252</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">229</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Warrant liabilities</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt; padding-left: 10pt; text-align: left">Paycheck protection program loan- current</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">396</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 20pt; text-align: left">Total current liabilities</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">3,312</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,902</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Paycheck protection program loan, less current portion</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">495</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Right-of-use liability, less current portion</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">887</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,078</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">Contract liabilities, less current portion</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">65</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt; padding-left: 20pt; text-align: left">Total liabilities</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">4,694</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">3,045</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Commitments and contingencies (Note 16)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Stockholders&rsquo; Equity:</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">Preferred stock, $0.001 par value; authorized 5,000,000 shares, none issued
    or outstanding</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Common stock, $0.001 par value; authorized 100,000,000 shares,</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">issued 50,589,809 and 12,939,420 shares, respectively</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">51</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">13</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Treasury stock, at cost; 21,040 and 4,251 shares, respectively</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(338</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(302</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">Additional paid-in capital</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">310,342</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">231,101</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Stock subscription receivable</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(1,983</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">Accumulated deficit</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(229,696</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(220,136</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt; padding-left: 10pt; text-align: left">Accumulated other comprehensive loss</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(177</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(183</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt; padding-left: 20pt; text-align: left">Total stockholders&rsquo; equity</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">78,199</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">10,493</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt; padding-left: 20pt; text-align: left">Total liabilities and stockholders&rsquo; equity</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">82,893</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">13,538</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

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

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

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A NAME="ar_004"></A>Ocean
Power Technologies, Inc. and Subsidiaries</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Unaudited
Consolidated Statements of Operations</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(in
$000&rsquo;s, except per share data)</B></FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Three months ended January
    31,</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Nine months ended January
    31,</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">2021</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">2020</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">2021</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">2020</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 36%">Revenues</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">317</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">725</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">604</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">1,131</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt">Cost of revenues</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">698</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">681</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">1,248</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">1,335</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 20pt; padding-bottom: 1.5pt; text-align: left">Gross profit/(loss)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(381</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">44</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(644</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(204</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Operating expenses:</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Engineering and product development costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,019</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">896</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">3,334</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">3,403</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; padding-bottom: 1.5pt; text-align: left">Selling, general and administrative costs</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">1,763</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">2,093</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">5,591</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">5,629</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 20pt; padding-bottom: 1.5pt; text-align: left">Total operating expenses</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">2,782</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">2,989</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">8,925</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">9,032</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Operating loss</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(3,163</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(2,945</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(9,569</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(9,236</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Gain due to the change in fair value of warrant liabilities</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">6</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Interest income, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">25</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">27</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">45</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">102</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Other expense, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(16</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(49</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">Foreign exchange gain/(loss)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">3</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(1</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">13</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(5</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">Net loss</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(3,151</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(2,919</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(9,560</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(9,133</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">Basic and diluted net loss per share</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(0.09</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(0.46</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(0.41</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(1.40</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; padding-bottom: 2.5pt; text-align: left">Weighted average shares used to compute basic and
    diluted net loss per share</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">33,715,334</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">6,318,162</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">23,160,885</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">6,543,500</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

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

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

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A NAME="ar_005"></A>Ocean
Power Technologies, Inc. and Subsidiaries</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Unaudited
Consolidated Statements of Comprehensive Loss</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(in
$000&rsquo;s)</B></FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Three months ended January
    31,</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Nine months ended January
    31,</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">2021</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">2020</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">2021</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">2020</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 36%; text-align: left">Net loss</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">(3,151</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">(2,919</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">(9,560</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">(9,133</TD><TD STYLE="width: 1%; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">Foreign currency translation adjustment</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(2</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(11</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">6</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(12</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">Total comprehensive loss</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(3,153</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(2,930</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(9,554</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(9,145</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD></TR>
</TABLE>

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



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

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A NAME="ar_006"></A>Ocean
Power Technologies, Inc. and Subsidiaries</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Unaudited
Consolidated Statement of Stockholders&rsquo; Equity</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(in
$000&rsquo;s, except share data)</B></FONT></P>

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


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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="34" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three Months Ended January
    31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 12pt">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Accumulated<BR></TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Common Shares</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Treasury Shares</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Additional<BR>
    Paid-In</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Stock<BR>
    Subscription</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Accumulated</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Other<BR>
    Comprehensive</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold">Total<BR>
    Stockholders&rsquo;</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Shares</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Amount</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Shares</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Amount</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Capital</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Receivable</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Deficit</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Loss</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Equity</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 28%">Balances at November 1, 2020</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">24,153,554</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">24</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">(4,251</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(302</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">240,782</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">-</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(226,545</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(175</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">13,784</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Net loss</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(3,151</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(3,151</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Share-based compensation</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">115</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">115</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Proceeds from stock options exercises</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">175,500</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">184</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(144</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">40</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>Exercise of common warrants, net of costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">677,500</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2,607</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(1,839</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">769</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Issuance of common stock- Aspire financing,</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">&nbsp;net of issuance costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,750,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">6,740</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">6,742</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Issuance of common stock- AGP At The</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">&nbsp;Market offering, net of issuance costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">23,833,255</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">24</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">59,914</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">59,938</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Acquisition of treasury stock</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(16,789</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(36</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(36</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Other comprehensive gain/(loss)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(2</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(2</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">Balance, January 31, 2021</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">50,589,809</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">51</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(21,040</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(338</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">310,342</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(1,983</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(229,696</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(177</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">78,199</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>


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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="34" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine Months Ended January
    31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 12pt">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Accumulated</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P></TD><TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Common Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Treasury Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Additional<BR>
    Paid-In</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Stock<BR>
    Subscription</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Accumulated</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Other<BR>
    Comprehensive</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Total<BR>
    Stockholders&rsquo;</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Amount</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Amount</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Capital</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Receivable</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Deficit</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Loss</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Equity</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 28%">Balances at May 1, 2020</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">12,939,420</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">13</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">(4,251</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(302</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">231,101</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">-</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(220,136</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(183</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">10,493</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Net loss</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(9,560</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(9,560</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Share-based compensation</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">338</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">338</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Proceeds from stock options exercises</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">175,500</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">184</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(144</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">40</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>Exercise of common warrants, net of costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">677,500</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2,607</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(1,839</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">769</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Issuance of common stock- Aspire financing,</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">&nbsp;net of issuance costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">7,275,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">7</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">9,976</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">9,983</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Issuance of common stock- AGP At The</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">&nbsp;Market offering, net of issuance costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">29,522,389</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">30</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">66,136</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">66,166</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Acquisition of treasury stock</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(16,789</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(36</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(36</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Other comprehensive gain/(loss)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">6</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">6</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">Balance, January 31, 2021</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">50,589,809</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">51</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(21,040</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(338</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">310,342</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(1,983</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(229,696</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(177</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">78,199</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

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

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

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Ocean
Power Technologies, Inc. and Subsidiaries</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Unaudited
Consolidated Statement of Stockholders&rsquo; Equity</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(in
$000&rsquo;s, except share data)</B></FONT></P>

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


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


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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="34" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three Months Ended January
    31, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Accumulated</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P></TD><TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Common Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Treasury Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Additional<BR>
    Paid-In</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Stock<BR>
    Subscription</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Accumulated</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Other<BR>
    Comprehensive</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Total<BR>
    Stockholders&rsquo;</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Amount</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Amount</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Capital</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Receivable</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Deficit</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Loss</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Equity</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 28%">Balances at November 1, 2020</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">6,489,668</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">7</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">(4,251</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(302</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">227,214</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">-</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(215,998</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(173</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">10,749</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Net loss</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(2,919</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(2,919</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Share-based compensation</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">56</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">56</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Issuance of restricted stock, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">65,060</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>Exercise of prefunded warrants, net of costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">264,280</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Issuance of common stock- Aspire financing,</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">&nbsp;net of issuance costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,024,205</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">849</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">850</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Issuance of common stock- AGP At The</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">&nbsp;Market offering, net of issuance costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">856,106</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,045</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,046</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Other comprehensive loss</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(11</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(11</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 2.5pt">Balances at January 31, 2020</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">8,699,319</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</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</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(4,251</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(302</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">229,167</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">-</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(218,917</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(184</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">9,774</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="34" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Nine Months Ended January
    31, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Accumulated</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P></TD><TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center"></TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Common Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Treasury Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Additional<BR>
    Paid-In</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Stock<BR>
    Subscription</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Accumulated</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Other<BR>
    Comprehensive</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Total<BR>
    Stockholders&rsquo;</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Amount</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Amount</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Capital</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Receivable</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Deficit</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Loss</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">Equity</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 28%">Balances at May 1, 2019</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">5,425,517</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">5</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">(3,770</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(301</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">226,026</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">-</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(209,784</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 4%; text-align: right">(171</TD><TD STYLE="width: 1%; text-align: left">)</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 4%; text-align: right">15,775</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Net loss</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(9,133</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(9,133</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>Share based compensation</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">225</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">225</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Issuance (forfeiture) of restricted stock, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">64,928</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>Exercise of prefunded warrants, net of costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">614,280</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(16</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(15</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Common stock issued for commitment fee</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">194,805</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">294</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">295</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Issuance of common stock- Aspire financing,</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">net of issuance costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,024,205</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">849</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">850</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Issuance of common stock- AGP At The</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Market offering, net of issuance costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,375,584</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,790</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,791</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Acquisition of treasury stock</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(481</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(1</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(1</TD><TD STYLE="text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Other comprehensive loss</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(12</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(12</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 2.5pt">Balances at January 31, 2020</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">8,699,319</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</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</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(4,251</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(302</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">229,167</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">-</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(218,917</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(183</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">9,774</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>


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

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A NAME="ar_007"></A>Ocean
Power Technologies, Inc. and Subsidiaries</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Unaudited
Consolidated Statements of Cash Flows</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(in
$000&rsquo;s)</B></FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Nine
    months ended January 31,</FONT></TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021</FONT></TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2020</FONT></TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="6" STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash flows from
    operating activities:</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; width: 60%; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
    loss</FONT></TD><TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="width: 16%; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(9,560</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="width: 16%; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(9,133</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Adjustments
    to reconcile net loss to net cash used in operating activities:</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 20pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Foreign
    exchange (gain)/loss</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(13</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 20pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Depreciation
    of fixed assets</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">106</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">117</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 20pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amortization
    of right of use asset</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">159</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">146</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 20pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Compensation
    expense related to stock option grants and restricted stock</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">338</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">225</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 20pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Gain
    due to the change in fair value of warrant liabilities</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(6</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 20pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Loss
    on disposal of property, plant and equipment</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 20pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Changes
    in operating assets and liabilities:</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 30pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accounts
    receivable</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">105</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(7</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 30pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
    assets</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">188</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(20</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 30pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
    assets</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(310</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">19</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 30pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accounts
    payable</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(473</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(194</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 30pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accrued
    expenses</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,192</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">257</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 30pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Change
    in lease liability</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(169</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(147</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 30pt; text-align: left; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
    liabilities</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(90</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">107</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 40pt; text-align: left; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
    cash used in operating activities</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(8,525</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(8,631</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash flows from
    investing activities:</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Purchase
    of property, plant and equipment</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(17</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(61</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 40pt; text-align: left; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
    cash used in investing activities</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(17</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(61</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash flows from
    financing activities:</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds
    from Paycheck Protection Program Loan</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">890</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds
    from loan payable</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">467</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Payment
    of loan payable</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(292</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds
    from stock option exercises</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">40</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds
    from issuance of common stock- Aspire financing net of issuance costs</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">9,983</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">850</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds
    from issuance of common stock- AGP At The Market offering, net of issuance costs</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">66,166</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,520</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds
    associated with exercise of common stock warrants</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">769</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds
    (costs) associated with exercise of pre-funded warrants</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(16</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Acquisition
    of treasury stock</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(36</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 40pt; text-align: left; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
    cash provided by financing activities</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">77,987</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2,353</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Effect
    of exchange rate changes on cash, cash equivalents and restricted cash</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">32</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(15</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 40pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net
    increase/(decrease) in cash, cash equivalents and restricted cash</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">69,477</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(6,354</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash,
    cash equivalents and restricted cash, beginning of period</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10,930</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">17,159</FONT></TD><TD STYLE="padding-bottom: 1.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cash,
    cash equivalents and restricted cash, end of period</FONT></TD><TD STYLE="padding-bottom: 2.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">80,407</FONT></TD><TD STYLE="padding-bottom: 2.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 2.5pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10,805</FONT></TD><TD STYLE="padding-bottom: 2.5pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Supplemental disclosure
    of noncash operating activities:</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Prepaid
    financing costs reported in accrued expenses</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">62</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">13</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Supplemental disclosure
    of noncash investing activities:</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Acquisition
    of property, plant and equipment through accounts payable</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">9</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Supplemental disclosure
    of noncash financing activities:</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Common
    stock issued for payment of commitment fee</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">295</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
    receivable for sale of shares through AGP at the Market program</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">271</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
    receivable for sale of shares from warrant exercises</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1,838</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Outstanding
    receivable for sale of shares from stock option exercises</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">144</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B></B></FONT></P>

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

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A NAME="ar_008"></A>Ocean
Power Technologies, Inc. and Subsidiaries</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Notes
to Unaudited Consolidated Financial Statements</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(1)
Background, Basis of Presentation and Liquidity</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>a)
Background</I></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Ocean
Power Technologies, Inc. (the &ldquo;Company&rdquo;, &ldquo;we&rdquo;, &ldquo;us&rdquo;, &ldquo;our&rdquo;) was founded in 1984
in New Jersey, commenced business operations in 1994 and re-incorporated in Delaware in 2007. We are a marine power solutions
provider. We control the design, manufacture, sales, installation, operations and maintenance of our products and solutions while
working closely with partners that provide payloads, integration services, and marine installation capabilities. We believe our
solutions provide persistent and reliable distributed offshore power along with communications for remote surface and subsea applications.
Our mission and purpose are to utilize our proprietary, state-of-the-art technologies to enhance the environment by reducing the
global carbon footprint through clean and renewable solutions for reliable electrical power and, in so doing, drive demand for
our products and services. Before 2015, government agencies had accounted for a significant portion of the Company&rsquo;s revenues.
These revenues were largely for the support of product development efforts relating to our technology. Today our goal is to generate
the majority of our revenue from the commercialization of products and solutions, and sales of services to support our business
operations. As we continue to develop and commercialize our products and services, we expect to use our cash on hand and cash
from operating activities to support our business until we can achieve positive cash flow from the commercialization of solutions,
products and services.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><I>b)</I></B></FONT> <FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><I>Basis of Presentation</I></B></FONT></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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 (&ldquo;GAAP&rdquo;) and for interim financial information in accordance with the Securities
and Exchange Commission (&ldquo;SEC&rdquo;), instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do
not include all the information and footnotes required by GAAP for complete financial statements. In the opinion of management,
all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included.
The interim operating results are not necessarily indicative of the results for a full year or for any other interim period. Further
information on potential factors that could affect the Company&rsquo;s financial results can be found in the Company&rsquo;s Annual
Report on Form 10-K for the year ended April 30, 2020 filed with the SEC and elsewhere in this Form 10-Q.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><I>c)</I></B></FONT> <FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><I>Liquidity/Going Concern</I></B></FONT></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Our consolidated financial statements have
been prepared assuming the Company will continue as a going concern. The Company has experienced recurring losses from operations,
and has used net cash in operating activities of approximately $8.5 million through the nine months ended January 31, 2021
and approximately $10.5 million for the fiscal year ending April 30, 2020 all of which have contributed to an accumulated
deficit of $229.7 million as of January 31, 2021. These factors raise substantial doubt about the Company&rsquo;s ability to continue
as a going concern. As of January 31, 2021, based in large part on the equity raises discussed below, the Company had approximately
$79.8 million in unrestricted cash and cash equivalents on hand. Based on the Company&rsquo;s current unrestricted
cash and cash equivalents balances, and its ability to raise additional equity under facilities currently in place, the Company
believes that it will be able to finance its capital requirements and operations for at least the next 12 months from
the date of this Report. The Company expects to continue to fund our business with sales of our securities and through generating
revenue with customers. The Company cannot provide assurances that it will be able to secure additional funding when needed or
at all, or, if secured, that such funding would be on favorable terms. The Company also cannot provide assurances that it will
generate sufficient revenue from customers to fund our business.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and
satisfaction of liabilities in the normal course of business. The consolidated financial statements do not include any adjustments
relating to the recoverability and classification of recorded assets amounts or the amounts and classification of liabilities
that might result from the outcome of this uncertainty.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Management
continues to evaluate different strategies to obtain the required additional funding for future operations. These strategies may
include, but are not limited to, continued pursuit of business opportunities, additional funding from current and /or new investors,
officers and directors; borrowings of debt; or a public offering of the Company&rsquo;s equity or debt securities, or the acquisition
of third-party entities that have similar business focuses. There can be no assurance that any of these future-funding efforts
will be successful. The Company currently has committed sources of equity financing through it&rsquo;s At the Market Offering
Agreement with A.G.P/Alliance Global Partners (&ldquo;AGP&rdquo;) and its equity line with Aspire Capital (discussed further below),
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. Historically, the Company has raised capital through securities sales in the public capital markets. The sale
of additional equity or convertible securities could result in dilution to stockholders. If additional funds are raised through
the issuance of debt securities, these securities could have rights senior to those associated with the Company&rsquo;s common
stock and could contain covenants that would restrict its operations. Financing may not be available in amounts or on terms acceptable
to the Company, or at all. If the Company is unable to obtain required financing, the Company may be required to curtail
or limit operations, product development costs, and/or selling, general and administrative activities in order to reduce its cash
expenditures, including its planned product development and marketing efforts, which could materially and adversely harm its
financial condition and operating results. If the Company is unable to secure additional financing, it may be unable to execute
its business plan, take advantage of future opportunities or be forced to cease operations.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
fiscal year 2020 and during the first nine months of fiscal year 2021 ended January 31, 2021, the Company has continued to make
investments in ongoing product development efforts in anticipation of future growth. The Company&rsquo;s future results of operations
involve significant risks and uncertainties. Factors that could affect the Company&rsquo;s future operating results and cause
actual results to vary materially from expectations include, but are not limited to, risks from lack of available financing and
insufficient capital, performance of products, its inability to market and commercialize its products and new products that it
may develop, technology development, scalability of technology and production, dependence on skills of key personnel, concentration
of customers and suppliers, deployment risks and laws, regulations and permitting.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>At
the Market Offering Agreements</I></FONT></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
November 20, 2020, the Company entered into a new At the Market Offering Agreement with AGP (the &ldquo;2020 ATM Facility&rdquo;).
The Company on December 4, 2020 filed a prospectus with Securities and Exchange Commission whereby, the Company may issue
and sell to or through AGP, acting as agent and/or principal, shares of the Company&rsquo;s common stock having an aggregate offering
price of up to $50.0 million. From inception of the 2020 ATM Facility through January 31, 2021, the Company sold and issued an
aggregate of 17,179,883 shares of its common stock with an aggregate market value of $50.0 million at an average price of $2.91
per share and paid AGP a sales commission of approximately $1.6 million related to those shares. The dollar amount reported
in the prospectus filing is fully utilized.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Equity
Line Common Stock Purchase Agreements</I></FONT></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
September 18, 2020, the Company entered into a new common stock purchase agreement with Aspire Capital which provided that, subject
to certain terms, conditions and limitations, Aspire Capital is committed to purchase up to an aggregate of $12.5 million of shares
of the Company&rsquo;s common stock over a 30-month period that does not exceed 19.99% of the outstanding common stock on the
date of the agreement. The number of shares the Company could issue within the 19.99% limit is 3,722,251 shares without shareholder
approval. Shareholder approval was received at the Company&rsquo;s annual meeting of stockholders on December 23, 2020 for
the sale of 9,864,706 additional shares of common stock which is over the 19.99% limit of outstanding common stock on the date
of the agreement. Through January 31, 2021, the Company has sold an aggregate of 2,250,000 shares of common stock with an aggregate
market value of $7.4 million at an average price of $3.28 per share pursuant to this common stock purchase agreement.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(2)
Summary of Significant Accounting Policies</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>(a)
Consolidation</I></B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.5pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>(b)
Use of Estimates</I></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify; background-color: white"><FONT 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 and the disclosure of contingent 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 estimated costs to complete projects; and the input method used to measure completion
over time of customer contracts for purposes of revenue recognition. Actual results could differ from those estimates.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>(c)
Cash, Cash Equivalents, Restricted Cash and Security Agreements</I></B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Cash
and Cash Equivalents</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT 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.</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 90%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">April 30, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="6" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 60%; text-align: left">Checking and savings accounts </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">2,597</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">1,551</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Money market account </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">77,204</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">8,451</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">79,801</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">10,002</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Restricted
Cash and Security Agreements</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has two agreements with Santander Bank, N.A. (&ldquo;Santander&rdquo;). Cash 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. Santander also
issued two letters of credit to subsidiaries of Enel Green Power (&ldquo;EGP&rdquo;) pursuant to the Company&rsquo;s contracts
with EGP. The first letter of credit was issued in the amount of $125,690 that expires in May 2021. The second letter of credit
was issued in the amount of $645,467 and reduced to $322,734 in August 2020. The second letter of credit will be
reduced to $64,547 once the PB3 PowerBuoy<SUP>&reg;</SUP> is fully deployed and passes final acceptance testing. The remaining
amount expires in December 2021.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Restricted
cash includes the following:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 90%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">April 30, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="6" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="width: 60%">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 16%; text-align: right">&nbsp;</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 16%; text-align: right">&nbsp;</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Santander Bank </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">606</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">928</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">606</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">928</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>&nbsp;</I></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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 Statement of Financial
Position that sum to the total of the same such amounts shown in the Statement of Cash Flows.</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 90%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">April 30, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="6" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR 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%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">79,801</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">10,002</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Restricted cash- short term </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">384</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">707</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR 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">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">222</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">221</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">80,407</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">10,930</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>(d)
Concentration of Credit Risk</I></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Financial
instruments that potentially subject the Company to credit risk consist principally of accounts receivable and cash and cash equivalents.
The Company believes that its credit risk is limited because the Company&rsquo;s current contracts are with companies with strong
financial strength. The Company invests its excess cash in a money market account and does not believe that it is exposed to any
significant risks related to its cash and money market accounts. Cash and cash equivalents are also maintained at foreign financial
institutions. Cash and cash equivalents in foreign financial institutions as of January 31, 2021 was $0.3 million.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
table below shows the percentage of the Company&rsquo;s revenues derived from customers whose revenues accounted for at least
10% of the Company&rsquo;s consolidated revenues for at least one of the periods indicated:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="14" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 36%; text-align: left">Eni S.p.A. </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">34</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">42</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">135</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">118</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Premier Oil UK Limited </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">5</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">27</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">126</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>EGP </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">223</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">678</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">379</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">774</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>ACET </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">33</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">37</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt">Other </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">27</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">26</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">113</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">317</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">725</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">604</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">1,131</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><I>(e) Share-Based Compensation</I></B></FONT></P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"><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: 0; text-align: justify; background-color: white"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Costs
resulting from all share-based payment transactions are recognized in the consolidated financial statements at their fair values.
The following table summarizes share-based compensation related to the Company&rsquo;s share-based plans by expense category for
the three and nine months ended January 31, 2021 and 2020:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="14" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 36%; text-align: left">Engineering and product development </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">32</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">12</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">91</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">52</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Selling, general and administrative </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">83</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">44</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">247</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">173</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Total share-based compensation expense </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">115</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">56</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">338</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">225</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(f)
<I>Revenue Recognition</I></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT 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&rsquo;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&rsquo;s
forecast of the total cost to satisfy the performance obligation plus an appropriate profit margin.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white">&nbsp;<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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
nature of the Company&rsquo;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. Accounting Standards Update (&ldquo;ASU&rdquo;) 2016-10 provides a practical expedient that permits presentation of shipping
and handling costs, that occur after control of the promised goods or services transfer to the customer, as fulfillment costs
rather than evaluating whether the shipping and handling activities are promised services to the customer. The Company adopted
this practical expedient, but it did not have a material effect on its Consolidated Financial Statements.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT 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&rsquo;s services. The selection of the method to measure progress towards completion requires judgment
and is based on the nature of the services to be provided. For the Company, the input method using costs incurred or time elapsed
best represents the measure of progress against the performance obligations incorporated within the contractual agreements. When
the Company&rsquo;s estimate of total costs to be incurred to satisfy the performance obligations exceed revenue, the Company
recognizes the loss immediately.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&rsquo;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.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT 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&rsquo;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&rsquo;s business. For the nine-month periods ended January 31, 2021 and 2020, all
of the Company&rsquo;s contracts were classified as firm fixed price.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2021, the Company&rsquo;s total remaining performance obligations, also referred to as backlog, totaled $0.5 million.
The Company expects to recognize approximately 89%, or $0.4 million, of the remaining performance obligations as revenue over
the next twelve months.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Products
and Solutions Leasing</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company enters into lease arrangements with certain customers for their products and solutions. As of January 31, 2021, the Company
has one lease arrangement with a remaining operating lease term of less than 10 months. Revenue related to multiple-element arrangements
is allocated to lease and non-lease elements based on their relative standalone selling prices or expected cost plus a margin
approach. Lease elements generally include a PB3 PowerBuoy<SUP>&reg;</SUP> <I>(&ldquo;</I>PB3&rdquo;) 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.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; 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: 0; text-align: justify"><FONT 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>&ldquo;Leases&rdquo;.</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.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; 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: 0 0 0 2pt; text-align: justify"><FONT 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 and nine months ended January 31, 2021
and 2020 was immaterial.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>(g)
Net Loss per Common Share</I></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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. Due to the Company&rsquo;s net losses,
potentially dilutive securities, consisting of options to purchase shares of common stock, warrants on common stock and
non-vested restricted stock issued to employees and non-employee directors, were excluded from the diluted loss per share
calculation due to their anti-dilutive effect.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
computing diluted net loss per share on the Consolidated Statement of Operations, warrants on common stock, options to purchase
shares of common stock and non-vested restricted stock issued to employees and non-employee directors, totaling 5,221,258 and
5,565,462 for the three and nine months ended January 31, 2021 and 2020, respectively, were excluded from each of the computations
as the effect would be anti-dilutive due to the Company&rsquo;s net losses.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>(h)
Recently Issued Accounting Standards</I></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify; text-indent: 0in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt; font-weight: normal">In
June 2016, the Financial Accounting Standards Board (&ldquo;FASB&rdquo;) issued ASU No. 2016-13, &ldquo;<I>Financial Instruments
</I>- <I>Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments.&rdquo; </I>The amendment in this update
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&mdash;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.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
August 2018, the FASB issued ASU No. 2018-13, <I>&ldquo;Fair Value Measurement (Topic 820).&rdquo; </I>The ASU modifies, removes,
and adds several disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement. The amendments on changes
in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair
value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most
recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively
to all periods presented upon their effective date. The Company adopted this guidance effective May 1, 2020. The adoption of the
guidance did not have a material effect on its Consolidated Financial Statements.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
August 2018, the FASB issued ASU No. 2018-15, &ldquo;<I>Intangibles </I>&mdash; <I>Goodwill and Other </I>&mdash; <I>Internal-Use
Software (Subtopic 350-40): Customer&rsquo;s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That
is a Service Contract.&rdquo;</I> The ASU requires a customer in a cloud computing arrangement that is a service contract to follow
the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer
and recognize as an asset. The ASU permits two methods of adoption: prospectively to all implementation costs incurred after the
date of adoption, or retrospectively to each prior reporting period presented. The Company adopted this guidance on a prospective
basis effective May 1, 2020. The adoption of the guidance did not have a material effect on its Consolidated Financial Statements.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(3)
Account Receivable, Contract Assets, and Contract Liabilities</B></FONT></P>

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 90%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">April 30, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="6" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 60%; text-align: left">Accounts receivable </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">-</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">105</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Contract assets </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">63</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">251</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Contract liabilities </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">75</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">165</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Accounts
Receivable</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0; text-align: justify"><FONT 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 good has transferred to the customer.
Accounts receivable represents an unconditional right to consideration arising from the Company&rsquo;s performance under contracts
with customers. The carrying value of such receivables represent their estimated realizable value.</FONT></P>

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


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    <DIV STYLE="break-before: page; margin-top: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Contract
Assets</I></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Significant
changes in the contract assets balances during the period are as follows:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 80%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Nine months ended</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 76%; text-align: left">Transferred to receivables from contract assets recognized at the beginning of the period </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 20%; text-align: right">(251</TD><TD STYLE="width: 1%; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Revenue recognized and not billed as of the end of the period </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">63</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Net change in contract assets </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(188</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD></TR>
</TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Contract
assets include unbilled amounts typically resulting from arrangements whereby the right to payment is conditioned on completing
additional tasks or services for a performance obligation. The decrease in contract assets is primarily a result of services performed
relating to our project with EGP that was billed during the nine months ended January 31, 2021.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Contract
Liabilities</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Significant
changes in the contract liabilities balances during the period are as follows:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 80%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Nine months ended</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 76%; 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%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 20%; text-align: right">(84</TD><TD STYLE="width: 1%; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Transferred to contract assets from contract liabilities recognized at the beginning of the period </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(6</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Net change in contract liabilities </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(90</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT 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 recognition of revenue relating to our Eni S.p.A. (&ldquo;Eni&rdquo;) project during the nine months ended January
31, 2021.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(4)
Other Current Assets</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Other
current assets consist of the following at January 31, 2021 and April 30, 2020:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 93%; font: 10pt Times New Roman, Times, Serif; margin-left: 0.5in">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-bottom: 1.5pt; font-size: 11pt; text-align: justify">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; font-weight: bold; text-align: center">April 30, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 11pt; text-align: justify">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="6" STYLE="text-align: center">(in thousands)</TD><TD STYLE="font-size: 11pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 11pt; text-align: justify">&nbsp;</TD><TD STYLE="font-size: 11pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-size: 11pt; text-align: justify">&nbsp;</TD><TD STYLE="font-size: 11pt">&nbsp;</TD><TD STYLE="font-size: 11pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-size: 11pt; text-align: justify">&nbsp;</TD><TD STYLE="font-size: 11pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 60%; text-align: justify">Deposits</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">126</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">60</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: justify">Other receivables</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">244</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: justify">Prepaid insurance</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">411</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">124</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: justify">Prepaid offering costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">56</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">275</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt; text-align: justify">Prepaid expenses- other</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">164</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">127</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt; font-size: 11pt; text-align: justify">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">1,001</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">588</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>


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


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    <DIV STYLE="break-before: page; margin-top: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(5)
Property and Equipment, net</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of property and equipment, net as of January 31, 2021 and April 30, 2020 consisted of the following:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 93%; font: 10pt Times New Roman, Times, Serif; margin-left: 0.5in">
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">April 30, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="6" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 60%">Equipment </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 16%; text-align: right">342</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 16%; text-align: right">342</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Computer equipment &amp; software </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">502</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">486</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Office furniture &amp; equipment </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">339</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">339</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Leasehold improvements </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">474</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">474</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR 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">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">15</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">15</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,672</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,656</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Less: accumulated depreciation </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(1,255</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(1,157</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font-weight: bold; padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">417</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">499</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Depreciation
expense was approximately $33,000 and $40,000 for the three-month periods ended January 31, 2021 and 2020, and approximately $106,000
and $117,000 for the nine-month periods ended January 31, 2021 and 2020, respectively.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(6)
Leases</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Lessor
Information</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2021, the Company has one lease which has been classified as an operating lease per accounting guidance contained
within ASC Topic 842,&rdquo; <I>Leases&rdquo;</I>. The Company&rsquo;s remaining term on this operating lease is less than 10
months. The maturity of lease payments remaining on this lease is immaterial.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Lessee
Information</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; 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: 0 0 0 2.15pt; text-align: justify"><FONT 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&rsquo;s principal offices and corporate headquarters. The initial lease term is for 7 years with an option to extend the
lease for another 5 years. 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&rsquo;s Consolidated Balance Sheets.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0 0 0 2.15pt; text-align: justify"><FONT 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. Lease expense
for minimum lease payments is recognized on a straight- line basis over the lease term and consists of interest on the lease liability
and the amortization of the right of use asset. Variable lease expenses, if any, are recorded as incurred.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
June 10, 2020 the Company signed a 12-month lease for office space in Houston, Texas. The lease can be extended by the Company
by providing the lessor on or before the notice date of the Company&rsquo;s intent to renew or terminate the lease. ASC Topic
842, <I>&ldquo;Leases&rdquo;</I> allows a company an accounting policy election to recognize lease payments to the Consolidated
Statement of Operations on a straight-line basis if the lease term is equal to or less 12 months and not recognize a right-of
use asset and lease liability. The accounting policy election is made on the commencement date of the lease.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; 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: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
operating lease cash flow payments for the nine months ended January 31, 2021 and 2020 was $259,000 and $240,000, respectively.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0 0 0 2.15pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
components of lease expense in the Consolidated Statement of Operations for both the three and nine months ended January 31, 2021
and 2020 was as follows:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="14" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 36%; text-align: left">Operating lease cost </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">79</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">79</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">238</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">238</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Short-term lease cost </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">7</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">12</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Total lease cost </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">86</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">79</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">250</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">238</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; 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: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Information
related to the Company&rsquo;s right-of use assets and lease liabilities as of January 31, 2021 was as follows:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 80%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; font-weight: bold; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</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>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="width: 78%; text-align: left">Operating right-of-use asset, net </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 18%; text-align: right">1,005</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Right-of-use liability- current </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">252</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt">Right-of-use liability- long term </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">887</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Total lease liability </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">1,139</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Weighted average remaining lease term- operating leases </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.72
years</FONT></TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Weighted average discount rate- operating leases </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">8.5</TD><TD STYLE="text-align: left">%</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Total
remaining lease payments under the Company&rsquo;s operating leases are as follows:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 70%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: left; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 74%; text-align: left">Remainder of fiscal year 2021 </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 22%; text-align: right">84</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">2022</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">341</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">2023</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">352</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">2024</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">362</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">2025</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">184</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Total future minimum lease payments </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,323</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Less imputed interest </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(184</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Total </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">1,139</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(7)
Accrued Expenses</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accrued
expenses consist of the following at January 31, 2021 and April 30, 2020:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 90%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">April 30, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="6" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 56%; text-align: left">Project costs </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 18%; text-align: right">95</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 18%; text-align: right">48</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Contract loss reserve </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">425</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">216</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Employee incentive payments </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">407</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Accrued salary and benefits </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">831</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">483</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Legal and accounting fees </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">403</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">283</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Accrued taxes payable </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">177</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt">Other </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">179</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">146</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">2,340</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">1,353</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(8)
Warrants</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Liability
Classified Warrants</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
June 2, 2016, the Company entered into a securities purchase agreement, which was amended on June 7, 2016 (as amended, the &ldquo;June
Purchase Agreement&rdquo;) with certain institutional purchasers (the &ldquo;June Purchasers&rdquo;). Pursuant to the terms of
the June Purchase Agreement, the Company sold an aggregate of 20,850 shares of Common Stock together with warrants to purchase
up to an aggregate of 7,298 shares of Common Stock. The warrants have an exercise price of $121.60 per share, became exercisable
on December 3, 2016 (&ldquo;Initial Exercise Date&rdquo;), and will expire five years following the Initial Exercise Date. As
of January 31, 2021, none of the warrants had been exercised.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
July 22, 2016, the Company entered into a Second Amendment to the Purchase Agreement (the &ldquo;Second Amended Purchase Agreement&rdquo;)
with certain institutional purchasers (the &ldquo;July Purchasers&rdquo;). Pursuant to the terms of the Second Amended Purchase
Agreement, the Company sold an aggregate of 29,750 shares of Common Stock together with warrants to purchase up to an aggregate
of 8,925 shares of Common Stock. The Warrants were exercisable immediately at an exercise price of $187.20 per share. The Warrants
will expire on the fifth (5th) anniversary of the initial date of issuance. As of January 31, 2021, none of the warrants had
been exercised.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Equity
Classified Warrants</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0 0 0 2.15pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
April 8, 2019, the Company issued and sold 1,542,000 shares of common stock and pre-funded warrants to purchase up to 3,385,680
shares of common stock and common warrants to purchase up to 4,927,680 shares of our common stock in an underwritten public offering.
The public offering price for the pre-funded warrants was equal to the public offering price of the common stock, less the $0.01
per share exercise price of each warrant. As of January 31, 2021, all of the pre-funded warrants had been exercised. The
common stock warrants have an exercise price of $3.85 per share and expire five years from the issuance date. From the issuance
to January 31, 2021, warrants to purchase 677,500 shares of the common stock had been exercised.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company accounted for the warrants issued in connection with its June and July 2016 public offerings in accordance with the guidance
in Topic 480 which provides that the Company classify the warrant instruments as a liability at its fair value. The warrant liabilities
are subject to re-measurement at each balance sheet date using the Black-Scholes option pricing model. The June and July 2016
warrants contain a feature whereby they could require the transfer of assets and therefore are classified as a liability award
in accordance with the guidance in Topic 480. The warrants have a value close to zero at January 31, 2021 and April 30, 2020 and
are reflected within &ldquo;Warrant liabilities&rdquo; in the Consolidated Balance Sheets. The pre-funded and common warrants
issued in the Company&rsquo;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 stockholders&rsquo; equity in the Consolidated Balance
Sheets.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(9)
Paycheck Protection Program Loan</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
a result of the COVID-19 pandemic, on March 27, 2020, the U.S. Government passed into law the Coronavirus Aid, Relief and Economic
Security Act, or the (&ldquo;CARES Act&rdquo;) which included the ability to secure loans under the Paycheck Protection Program
(&ldquo;PPP&rdquo;). On May 3, 2020, after its application was submitted and approved, the Company signed a PPP loan with Santander as the lender for $890,347 pursuant to the PPP under the CARES Act, as implemented by the
U.S. Small Business Association (&ldquo;SBA&rdquo;). The PPP loan is an unsecured note with Santander as the lender and governed
by a loan agreement with Santander. The interest rate is 1% and the loan is repayable over two years. The loan contains customary
events of defaults relating to, among other things, payment defaults or breaches of the terms of the loan. Upon the occurrence
of an event of default, the lender may require immediate repayment of all outstanding amounts under the loan. Interest and principal
payments are deferred for the first 6 months from the date of the loan. Principal and interest of approximately $49,000 are payable
monthly commencing 6 months after the disbursement date and may be repaid by the Company at any time prior to maturity with no
prepayment penalties. The Company received the proceeds on May 5, 2020.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
SBA allows loan forgiveness for eligible costs incurred and paid which include (a) payroll costs, (b) interest on any real or
personal property mortgage prior to February 15, 2020, (c) rent on any lease in force prior to February 15, 2020, and (d) utility
payments for which service began before February 15, 2020. As of January 31, 2021, the Company has utilized all of the loan proceeds.
The Company currently believes that the use of the loan proceeds will meet the conditions for forgiveness of the loan and has
submitted a loan forgiveness application to the SBA asking for 100% forgiveness of the loan. No assurance can be provided that
the Company will obtain forgiveness of the loan, in whole or in part.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
June 5, 2020, the Paycheck Protection Program Flexibility Act (&ldquo;PPPFA&rdquo;) was signed into law. Among other changes,
the PPPFA (a) reduced the amount of the loan required to be spent on payroll costs from 75% to 60%, (b) extended the covered period
to 24 weeks from 8 weeks, (c) extended the repayment term of the PPP loan from 2 years to 5 years, and (d) increased the deferred
payment date from 6 months to 10 months. For the loans disbursed before June 5, 2020, the PPPFA provides the option to opt for
24 weeks for spending the loan instead of 8 weeks. The Company opted for 24 weeks to spend the loan.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company is accruing interest expense until the loan is forgiven or repaid. If the loan were not forgiven by the SBA and the Company
decided to repay the loan over 2 years, the interest expense for this loan period would be immaterial.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(10)
Loan Payable</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
August 2020 the Company signed a commercial premium finance agreement in the amount of $466,622 with First Insurance Funding whereas
First Insurance Funding prepaid a portion of the Company insurance premiums including principally the Directors and Officers insurance.
The Company will make eight monthly payments of $58,957, inclusive of interest charges, to repay First Insurance Funding the
amount. Interest expense for the loan period is immaterial.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(11)
Preferred Stock</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company has authorized 5,000,000 shares of undesignated preferred stock with a par value of $0.001 per share. As of January 31,
2021, no shares of preferred stock had been issued.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(12)
Common Stock</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>At
the Market Offering Agreements</I></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
January 7, 2019, the Company entered into the 2019 ATM Facility with AGP, under which the Company may issue and sell to or through
A.G.P./Alliance Global Partners, acting as agent and/or principal, shares of the Company&rsquo;s common stock having an aggregate
offering price of up to $25.0 million. From inception of the program through its termination on December 8, 2020,
under the 2019 ATM Facility the Company had sold and issued an aggregate of 17,595,472 shares of its common stock with an
aggregate market value of $23.4 million at an average price of $1.33 per share, including 12,342,506 shares in fiscal year 2021
with an aggregate market value of $18.7 million at an average price of $1.51 per share and paid AGP a sales commission of approximately
$0.8 million related to those shares. The agreement was fully utilized and terminated on December 8, 2020.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
November 20, 2020, the Company entered into a new At the Market Offering Agreement with AGP (the &ldquo;2020 ATM Facility&rdquo;).
The Company on December 4, 2020 filed a prospectus with Securities and Exchange Commission whereby, the Company may issue
and sell to or through AGP, acting as agent and/or principal, shares of the Company&rsquo;s common stock having an aggregate offering
price of up to $50.0 million. From inception of the 2020 ATM Facility through January 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. The dollar amount reported
in the prospectus filing is fully utilized.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Equity
Line Common Stock Purchase Agreements</I></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
October 24, 2019, the Company entered into a common stock purchase agreement with Aspire Capital which provided that, subject
to certain terms, conditions and limitations, Aspire Capital is committed to purchase up to an aggregate of $10.0 million of shares
of the Company&rsquo;s common stock over a 30-month period. Through September 18, 2020, the Company has sold an aggregate of 6,424,205
shares of common stock with an aggregate market value of $4.0 million at an average price of $0.63 per share pursuant to this
common stock purchase agreement, including 5,025,000 shares in fiscal year 2021 with an aggregate market value of $2.9 million
at an average price of $0.57 per share. The agreement was fully utilized and terminated on September 18, 2020.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
September 18, 2020, the Company entered into a new common stock purchase agreement with Aspire Capital which provided that, subject
to certain terms, conditions and limitations, Aspire Capital is committed to purchase up to an aggregate of $12.5 million of shares
of the Company&rsquo;s common stock over a 30-month period that does not exceed 19.99% of the outstanding common stock on the
date of the agreement. The number of shares the Company could issue within the 19.99% limit is 3,722,251 shares without shareholder
approval. Shareholder approval was received at the Company&rsquo;s annual meeting of stockholders on December 23, 2020 for
the sale of 9,864,706 additional shares of common stock which is over the 19.99% limit of the outstanding common stock on the
date of the agreement. Through January 31, 2021, the Company has sold an aggregate of 2,250,000 shares of common stock with an
aggregate market value of $7.4 million at an average price of $3.28 per share pursuant to this common stock purchase agreement.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(13)
Treasury Shares</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0; text-align: justify">During each of the three months ended January
31, 2021 and 2020, 16,789 shares and zero shares of common stock were purchased by the Company from employees to pay taxes related
to the vesting of restricted stock. <FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">During each
of the nine months ended January 31, 2021 and 2020, 16,789 shares and 481 shares of common stock were purchased by the Company
from employees to pay taxes related to the vesting of restricted stock.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(14)
Share-Based Compensation</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
2015, upon approval by the Company&rsquo;s stockholders, the Company&rsquo;s 2015 Omnibus Incentive Plan (the &ldquo;2015 Plan&rdquo;)
became effective. A total of 1,332,036 shares are authorized for issuance under the 2015 Omnibus Incentive Plan, including shares
available for awards under the 2006 Stock Incentive Plan remaining at the time that plan terminated, or that were subject to awards
under the 2006 Stock Incentive Plan that thereafter terminated by reason of expiration, forfeiture, cancellation or otherwise.
If any award under the 2006 Stock Incentive Plan or 2015 Plan expires, is cancelled, terminates unexercised or is forfeited, those
shares become again available for grant under the 2015 Plan. The 2015 Plan will terminate ten years after its effective date,
in October 2025, but is subject to earlier termination as provided in the 2015 Plan. As of January 31, 2021, the Company has 193,928
shares available for future issuance under the 2015 Plan.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
January 18, 2018, the Company&rsquo;s Board of Directors adopted the Company&rsquo;s Employment Inducement Incentive Award Plan
(the &ldquo;2018 Inducement Plan&rdquo;) pursuant to which the Company reserved 25,000 shares of common stock for issuance under
the Inducement Plan. In accordance with Rule 5635(c)(4) and Rule 5635(c)(3) of the Nasdaq Listing Rules, awards under the Inducement
Plan may only be made to individuals not previously employees of the Company (or following such individuals&rsquo; bona fide period
of non-employment with the Company), as an inducement material to the individuals&rsquo; entry into employment with the Company.
An award is any right to receive the Company&rsquo;s common stock pursuant to the 2018 Inducement Plan, consisting of a performance
share award, restricted stock award, a restricted stock unit award or a stock payment award. As of January 31, 2021, there were
11,487 shares available for grant under the 2018 Inducement Plan.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Stock
Options</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company estimates the fair value of each stock option award granted with service-based vesting requirements, using the Black-Scholes
option pricing model, assuming no dividends, and using the weighted average valuation assumptions noted in the following table.
The risk-free rate is based on the US Treasury yield curve in effect at the time of grant. The expected life (estimated period
of time outstanding) of the stock options granted is estimated using the &ldquo;simplified&rdquo; method as permitted by the SEC&rsquo;s
Staff Accounting Bulletin No. 110, <I>Share-Based Payment.</I> Expected volatility is based on the Company&rsquo;s historical
volatility over the expected life of the stock option granted. The Company granted options to acquire 248,876 and 411,666 shares
of common stock during the three and nine months ended January 31, 2021 and 2020. The following assumptions were used to
value the awards:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 32%; text-align: left">Risk-free interest rate </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">0.6</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 14%; text-align: right">1.7</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">0.6</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 14%; text-align: right">1.7</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Expected dividend yield </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.0</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.0</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.0</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.0</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Expected life (in years) </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5.5 - 5.7</FONT></TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5.5 - 5.7</FONT></TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5.5 - 5.7</FONT></TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5.5 - 5.7</FONT></TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Expected volatility </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">136.5</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">127.6% - 128.2</FONT></TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">136.5</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">127.6% - 128.2</FONT></TD><TD STYLE="text-align: left">%</TD></TR>
</TABLE>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT 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.</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Weighted</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Average</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Weighted</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Remaining</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Shares</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Average</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Contractual</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Underlying</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Exercise</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Term</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Options</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Price</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">(In Years)</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 52%">Outstanding as of April 30, 2020 </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">474,128</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">3.56</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">9.4</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>Granted </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">248,876</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">2.93</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>Exercised </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(175,500</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1.05</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt">Cancelled/forfeited </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(28,719</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">$</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">6.29</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 2.5pt">Outstanding as of January 31, 2021 </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">518,785</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">$</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">3.96</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">9.2</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">Exercisable as of January 31, 2021 </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">249,577</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">$</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">5.21</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">8.5</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2021, the total intrinsic value of outstanding and exercisable options was approximately $0.9 million and $0.6
million, respectively. As of January 31, 2021, approximately 269,208 additional options were unvested, which had an intrinsic
value of $0.3 million and a weighted average remaining contractual term of 9.9 years. There was approximately $82,000 and $44,000
of total recognized compensation cost related to stock options during each of the three months ended January 31, 2021 and 2020,
respectively. There was approximately $0.3 million and $0.2 million of total recognized compensation cost related to stock
options during each of the nine months ended January 31, 2021 and 2020, respectively. As of January 31, 2021, there was approximately
$0.7 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 1.9 years.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Performance
Stock Options</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
January of 2020, the Company issued 81,334 performance-based stock options to two of its executives. The awards can vest over
2 years if there is positive total shareholder return (e.g. share price increase) as measured to the 5-day (January 11-15, 2021)
and (January 10-14, 2022) share price Volume Weighted Average Price (&ldquo;VWAP&rdquo;).</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
January of 2021, the Company issued 344,723 performance-based stock options to employees and executives. The awards vest over
2 years provided there is positive total shareholder return (e.g. share price increase) as measured to the closing share price
on January 14, 2022 and January 14, 2023.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company determined these awards contain a market- based condition and estimated the fair value using the Monte Carlo simulation
model with the following assumptions:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 36%; text-align: left">Risk-free interest rate </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">1.2</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">2.3</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">1.2</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">2.3</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Expected dividend yield </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.0</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.0</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.0</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.0</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Expected life (in years) </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">10.0</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">10.0</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">10.0</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">10.0</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Expected volatility </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">76.0%- 136.5</FONT></TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">115.0</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">76.0%- 136.5</FONT></TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">115.0</TD><TD STYLE="text-align: left">%</TD></TR>
</TABLE>

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


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    <DIV STYLE="break-before: page; margin-top: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT 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.</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Weighted</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Average</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Weighted</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Remaining</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Shares</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Average</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Contractual</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Underlying</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Exercise</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Term</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Options</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Price</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">(In Years)</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 52%">Outstanding as of April 30, 2020 </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">81,347</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">1.05</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">9.7</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>Granted </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">344,723</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">2.93</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>Exercised </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt">Cancelled/forfeited </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">$</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 2.5pt">Outstanding as of January 31, 2021 </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">426,070</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">$</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">2.57</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">9.8</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">Exercisable as of January 31, 2021 </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">40,681</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">$</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">1.05</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">9.0</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of January 31, 2021, the total intrinsic value of both outstanding and exercisable options was approximately $0.6 million and
zero, respectively. As of January 31, 2021, approximately 385,389 additional options were unvested, which had an intrinsic
value of $0.5 million and a weighted average remaining contractual term of 9.8 years. There was approximately $26,000 and
$1,600 of total recognized compensation cost related to stock options during each of the three months ended January 31, 2021
and 2020, respectively. There was approximately $43,000 and $1,600 of total recognized compensation cost related to stock
options during each of the nine months ended January 31, 2021 and 2020, respectively. As of January 31, 2021, there was
approximately $0.7 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 1.8 years.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Restricted
Stock</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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 and nine months ended January 31, 2021 and 2020, the
Company granted 10,000 and 13,513 shares subject to service-based vesting requirements.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 90%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Weighted</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Number</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">Average Price per</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">of Shares</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Share</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 62%; text-align: left">Issued and unvested at April 30, 2020 </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">13,513</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 18%; text-align: right">1.48</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>Granted </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">10,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">2.93</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>Vested </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(13,513</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1.48</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt">Cancelled/forfeited </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">$</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Issued and unvested at January 31, 2021 </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">10,000</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">$</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">2.93</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify">There was approximately $2,000 and $5,000
of total recognized compensation cost related to restricted stock for the three months ended January 31, 2021 and 2020, respectively.
<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">There was approximately $12,000 and $10,000 of total
recognized compensation cost related to restricted stock for the nine months ended January 31, 2021 and 2020, respectively. As
of January 31, 2021, there is $28,000 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 1.0 years.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
December 2019, the Company granted 51,547 shares, subject to service-based vesting requirements, to an employee that were outside
the Company stock incentive plans. There was approximately $5,000 and $7,000 of total recognized compensation cost related
to this award for the three months ended January 31, 2021 and 2020, respectively. There was approximately $30,000 and $8,000
of total recognized compensation cost related to this award for the nine months ended January 31, 2021 and 2020, respectively.
As of January 31, 2021, there is no unrecognized compensation cost remaining related to this award.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(15)
Fair Value Measurements</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">ASC
Topic 820,&rdquo;<I>Fair Value Measurements&rdquo;</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.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><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: 0.75in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Level
    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">Unadjusted
    quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement
    date.</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Level
    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">Inputs
    other than quoted prices in active markets that are observable for the asset or liability, either directly or indirectly.</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Level
    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">Inputs
    that are unobservable for the asset or liability.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Disclosure
of Fair Values</I></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
fair value of the Company&rsquo;s warrant liabilities (refer to Note 8) is based on the Black-Scholes option pricing model which
is based on Level 3 unobservable inputs for which there is little or no market data, requiring the Company to develop its own
assumptions. The assumptions used by the Company are the quoted price of the Company&rsquo;s common stock in an active market,
risk-free interest rate, volatility and expected life, and assumes no dividends. Volatility is based on the actual market activity
of the Company&rsquo;s stock. The expected life is based on the remaining contractual term of the warrants and the risk-free interest
rate is based on the implied yield available on U.S. Treasury Securities with a maturity equivalent to the warrants&rsquo; expected
life. The fair value on a recurring basis as of January 31, 2021 and April 30, 2020 was near zero.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Unrealized
gains of approximately zero for the three months ended January 31, 2021 and 2020, respectively, and zero and $6,000 for the nine
months ended January 31, 2021 and 2020, respectively, were included within &ldquo;Gain due to change in fair value of warrant
liabilities&rdquo; in the Consolidated Statements of Operations. The Company determined the fair value using the Black-Scholes
option pricing model with the following assumptions:</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 90%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">January 31, 2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 56%; text-align: left">Dividend rate </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 18%; text-align: right">0.0</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 18%; text-align: right">0.0</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Risk-free rate </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">0.07% - 0.08</FONT></TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1.5</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Expected life (years) </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">0.5 - 0.8</FONT></TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.3 - 1.4</FONT></TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Expected volatility </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">146.1</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">109.8% - 130.1</FONT></TD><TD STYLE="text-align: left">%</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Besides
the unrealized gain in fair value, there was no other activity to the balances in warrant liabilities during the nine months ended
January 31, 2021 and 2020, respectively.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT 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 nine months ended January 31, 2021 and 2020.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(16)
Commitments and Contingencies</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Employment
Litigation</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
June 10, 2014, the Company announced that it had terminated Charles Dunleavy as its Chief Executive Officer and as an employee
of the Company for cause, effective June 9, 2014, and that Mr. Dunleavy had also been removed from his position as Chairman of
the Board of Directors. On June 17, 2014, Mr. Dunleavy wrote to the Company stating that he had retained counsel to represent
him in connection with an alleged wrongful termination of his employment. On July 28, 2014, Mr. Dunleavy resigned from the Board
and the boards of directors of the Company&rsquo;s subsidiaries.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify; background-color: white"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
August 28, 2018, counsel for Mr. Dunleavy filed a demand for arbitration, captioned <I>Charles F. Dunleavy v. Ocean Power Technologies,
Inc.,</I> Case No. 01-18-0003-2374, before the American Arbitration Association in New Jersey. The demand names Ocean Power Technologies,
Inc. as the respondent and alleges various claims and seeks declaratory relief and permanent injunction. The demand seeks damages
in the amount of $5.0 million for compensatory and punitive damages, plus interest and attorneys&rsquo; fees as well as
certain equitable relief. On November 8, 2018, the Company through counsel responded to the demand for arbitration, denied all
allegations, and asserted various affirmative defenses. The final day of hearing occurred in Princeton, New Jersey on July 15,
2020. Post-hearing briefs were filed on September 22, 2020. On December 10, 2020, the panel issued an interim award that, by its
express terms, is not a final award, is strictly confidential, and shall not be publicly disclosed. The parties are considering
next steps. As of January 31, 2021, the Company has not accrued any provision related to this matter since any possible loss cannot
be reasonably estimated. Depending on the nature of the loss, the Company believes it may be covered by insurance.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Nasdaq
Delisting Notification</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
March 3, 2020, the Company received a notification from the Nasdaq indicating that the minimum bid price of the Company&rsquo;s
common stock had been below $1.00 per share for 30 consecutive business days and as a result, the Company was not
in compliance with the minimum bid price requirement for continued listing. The Nasdaq notice had no immediate effect on
the listing or trading of the Company&rsquo;s common stock. Under the Nasdaq Listing Rules, the Company had a grace period
of 180 calendar days, or until August 31, 2020, in which to regain compliance with the minimum bid price rule. To regain compliance,
the closing bid price of the Company&rsquo;s common stock must meet or exceed $1.00 per share for a minimum of ten consecutive
business days during this grace period. On August 21, 2020, the Company received notification from Nasdaq that, as a result of
the closing bid price of the Company&rsquo;s common stock being over $1.00 for 10 consecutive trading days, the Company had
regained compliance with Listing Rule 5550(a)(2) to maintain the listing of its common stock on Nasdaq and Nasdaq considers
the matter closed.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Spain
Income Tax Audit</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company underwent an income tax audit in Spain for the period from 2011 to 2014, when our Spanish branch was closed. In connection
with the tax audit, the Spanish tax inspector challenged the Company&rsquo;s recognition of grant funds received in 2011 to 2014
from the European Commission in connection with the Company&rsquo;s Waveport project. On July 30, 2018, the inspector concluded
that although there was no tax owed in light of losses reported, the Company&rsquo;s Spanish branch owed penalties for failure
to properly account for the income associated with the funding grant. On August 30, 2018, the Company filed an administrative
appeal of the penalty and its underlying conclusions. During the three months ended July 31, 2020, the Company received notice
from the Spanish Central Economic and Administrative Tribunal that it agreed with the inspector and ruled that the Company owes
the full amount of the penalty in the amount of &euro;279,869.81 or approximately $331,000. In the quarter ended October 31, 2020,
the Company recorded an additional reserve of &euro;117,145.81 (or approximately $154,000) to Selling, general and administrative
costs in the Statement of Operations making the total reserve &euro;279,869.81, which amount was paid by the Company to the Spanish
Tax Administration on January 25, 2021. At this time, the Company plans to continue appealing the decision of the Tribunal tax
assessment to the Spanish National Court. As of January 31, 2021, and April 30, 2020, the Company has reserved zero and
&euro;162,724 (or approximately $177,000), respectively. The penalty was recorded in Accrued expenses in the Consolidated Balance
Sheets.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(17)
Income Taxes</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Uncertain
Tax Positions</I></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT 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, as discussed above. At January 31, 2021, the Company had no other unrecognized tax positions. The
Company does not expect any material increase or decrease in its income tax expense in the next twelve months, related to examinations
or uncertain tax positions. U.S. federal and state income tax returns were audited through fiscal 2014 and fiscal 2010 respectively.
Net operating loss and credit carry forwards since inception remain open to examination by taxing authorities and will continue
to remain open for a period of time after utilization.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(18)
Operating Segments and Geographic Information</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&rsquo;s business consists of one segment as this represents management&rsquo;s view of the Company&rsquo;s operations.
The Company operates on a worldwide basis with one operating company in the US and subsidiaries in the UK and in Australia. Revenues
and expenses are generally attributed to the operating unit that bills the customers. During each of the nine months ended January
31, 2021 and 2020, the Company&rsquo;s primary business operations were in North America.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"><B>(19) Subsequent
Events</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On February 1, 2021, the Company entered into
a unit purchase agreement (the &ldquo;3dent Agreement&rdquo;), pursuant to which the Company acquired all of the outstanding equity
interest of 3dent Technology, LLC (&ldquo;3dent&rdquo;), a Houston, Texas based company that offers offshore energy engineering
and design services that are complementary to OPT&rsquo;s technology and products. In consideration for the purchase, the Company
issued 361,991 shares of its common stock to the sellers with an agreed value of $800,000 based on the closing price of the Company&rsquo;s
common stock on the date that the Company agreed to terms with 3dent. In addition, the former owners of 3dent will be eligible
for awards of performance stock with a potential value of $360,000 if certain revenue targets are achieved over the next 12 months.
The 3dent Agreement includes a number of other standard representations, warranties, covenants and indemnifications.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company is accounting for the transaction
as a business combination under ASC 805, <I>&ldquo;Business Combinations.&rdquo; </I>Accordingly, the assets acquired and the
liabilities assumed will be recorded at their estimated fair value on the date of acquisition. Goodwill from the acquisition principally
relates to excess value of the purchase price over the fair value of identified net assets and liabilities. Under ASC 805, acquisition-related
transaction costs (such as advisory, legal, valuation, other professional fees) have been expensed in the statement of operations
in the period incurred.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</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"><B>Item 2.</B></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif"><B><A NAME="pri_001"></A>MANAGEMENT&rsquo;S DISCUSSION AND ANALYSIS OF FINANCIAL
    CONDITION AND RESULTS OF OPERATIONS</B></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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&rsquo;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 &ldquo;Risk Factors&rdquo; section of our Annual Report on Form 10-K for the year ended April 30, 2020 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 2020 refers to the year ended April 30, 2020).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Business Update Regarding COVID-19</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 27.35pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The current COVID-19 pandemic has presented
substantial health and economic risks, uncertainties and challenges to our business, the global economy and financial markets.
It is not currently possible to predict how long the pandemic will last or the time it will take for economies to return to prior
levels. The extent to which COVID-19 impacts our business, operations, financial results and financial condition, and those of
our suppliers and customers will depend on future developments which are highly uncertain and cannot be predicted with certainty
or clarity, including the duration and continuing severity of the outbreak and additional government actions to contain COVID-19.
The volatility caused in the stock markets by the pandemic may make it difficult for the Company to raise capital. In March 2020,
one of the Company&rsquo;s customers cancelled a portion of their contract due to the outbreak of COVID-19 and instead extended
an existing lease. In April 2020, the Company declared force majeure on a contract with a different customer and delayed the deployment
of its PB3 PowerBouy&reg; in Chile that was scheduled for April 2020 due to travel restrictions imposed by the U.S. and Chile.
For additional information on various uncertainties and risks posed by the COVID-19 pandemic, see Part II, Item 1A &ldquo;Risk
Factors&rdquo; of this report.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">As a result of the COVID-19 pandemic, in March
2020, the Company put in place a number of protective measures. These measures included the canceling of all non-critical travel,
requesting that employees limit non-essential personal travel, eliminating all but essential third-party access to our facilities,
enhancing our facility janitorial and sanitary procedures, encouraging employees to work from home to the extent their job function
enables them to do so, encouraging the use of virtual employee meetings, and providing staggered shifts and social distancing
measures for those employees associated with production operations. As of June 2020, the Company reoccupied its facilities although
individuals can work from home if necessary.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On March 27, 2020, the U.S. Government passed
into law the Coronavirus Aid, Relief and Economic Security Act, or the (&ldquo;CARES Act&rdquo;). On May 3, 2020, the Company
signed a Paycheck Protection Program (&ldquo;PPP&rdquo;) loan with Santander Bank, N.A. (&ldquo;Santander&rdquo;) as the lender
for $890,347 in support through the Small Business Association (&ldquo;SBA&rdquo;) under the PPP Loan. The PPP Loan is unsecured
and evidenced by a note in favor of Santander as the lender and governed by a Loan Agreement with Santander. The interest rate
is 1% and the loan is repayable over two years. The loan contains customary events of defaults relating to, among other things,
payment defaults or breaches of the terms of the loan. Upon the occurrence of an event of default, the lender may require immediate
repayment of all outstanding amounts under the loan. Interest and principal payments are deferred for the first 6 months from
the date of the loan. Principal and interest are payable monthly commencing 6 months after the disbursement date and may be repaid
by the Company at any time prior to maturity with no prepayment penalties. The Company received the proceeds on May 5, 2020.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The SBA allows loan forgiveness for eligible
costs incurred and paid which include a) payroll costs, b) interest on any real or personal property mortgage prior to February
15, 2020, c) rent on any lease in force prior to February 15, 2020, and d) utility payments for which service began before February
15, 2020. As of January 31, 2021, the Company has utilized all of the loan proceeds. The Company currently believes that the use
of the loan proceeds will meet the conditions for forgiveness of the loan and has submitted a loan forgiveness application
to the SBA asking for 100% forgiveness of the loan. No assurance can be provided that the Company will obtain forgiveness
of the loan, in whole or in part.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On June 5, 2020, the Paycheck Protection Program
Flexibility Act (&ldquo;PPPFA&rdquo;) was signed into law. Among other changes, the PPPFA (a) reduced the amount of the loan required
to be spent on payroll costs from 75% to 60%, (b) extended the covered period to 24 weeks from 8 weeks, (c) extended the repayment
term of PPP loan from 2 years to 5 years, and (d) increased the deferred payment date from 6 months to 10 months. For the loans
disbursed before June 5, 2020, the PPPFA provides the option to opt for 24 weeks for spending the loan instead of 8 weeks. The
Company has opted for 24 weeks to spend the loan.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Overview</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We are a marine power solutions provider.
We control the design, manufacture, sales, installation, operations and maintenance of our products and solutions while working
closely with partners that provide payloads, integration services, and marine installation capabilities. We believe our solutions
provide persistent and reliable distributed offshore power along with communications for remote surface and subsea applications.
Our mission and purpose are to utilize our proprietary, state-of-the-art technologies to enhance the environment by reducing the
global carbon footprint through clean and renewable solutions for reliable electrical power and, in so doing, drive demand for
our products and services.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We also continue to develop and commercialize
our proprietary systems that generate electricity by harnessing the renewable energy of ocean waves for our PB3 PowerBuoy&reg;,
and solar power for our newest product, the hybrid PowerBuoy&reg;. The PB3 PowerBuoy&reg; uses proprietary technologies that convert
the kinetic energy created by the heaving motion of ocean waves into electricity. Based on feedback from our current customers,
discussions with potential future customers in the offshore oil and gas, defense and security, science and research, and communications,
as well as government applications in fishery protection, together with our market research and publicly available data, we believe
that numerous markets have a direct need for our solutions. While our recent projects have been in the oil and gas industry, we
believe there is an increasing need for our products and solutions in areas such as fishery protection, offshore windfarm support,
marine surveillance, and ocean-based science and research applications. We believe that having demonstrated the capability of
our solutions, we can advance our product and services and gain further adoption from our target markets. Our marketing efforts
are focused on offshore locations that require a cost-efficient solution for renewable, reliable and persistent power and communications,
either by supplying electric power to payloads that are integrated directly with our product or located in its vicinity, such
as on the seabed and in the water column. We believe we are the leader in offshore autonomous ocean wave power conversion technology
which provides renewable power for offshore operations that were previously difficult to decarbonize.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On February 1, 2021, the Company acquired
all of the outstanding equity interest of 3dent Technology, a limited liability company based in Houston, Texas that offers
offshore energy engineering and design services that are complementary to OPT&rsquo;s technology and products. Our
achievements during the first nine months of fiscal 2021 included the Company&rsquo;s continued work on EGP and Eni projects.
In November 2020, the Company entered into an agreement with the Offshore Operators Committee (&ldquo;OOC&rdquo;) under which
the Company will provide engineering and technical services for a new project under the DeepStar Global Technology Consortium
Program. In October 2020, the Company entered into an agreement with Adams Communication &amp; Engineering Technology, Inc.
(&ldquo;ACET&rdquo;) to conduct a feasibility study for the evaluation of a PB3 PowerBuoy&reg; power and 5G communications
solution in support of the U.S. Navy&rsquo;s Naval Postgraduate School&rsquo;s Sea, Land, Air, Military Research Initiative
(&ldquo;SLAMR&rdquo;). </P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We were incorporated in New Jersey in 1984,
began business operations in 1994, and were re-incorporated in Delaware in 2007. We currently have five wholly-owned subsidiaries:
Ocean Power Technologies Ltd., organized under the laws of the United Kingdom, Reedsport OPT Wave Park LLC, organized under the
laws of Oregon, and Oregon Wave Energy Partners I, LLC, organized under the laws of Delaware, and as of February 1, 2021 3dent Technology,
LLC, plus Ocean Power Technologies (Australasia) Pty Ltd (&ldquo;OPTA&rdquo;), organized under the laws of Australia. OPTA
owns 100% of Victorian Wave Partners Pty. Ltd. (&ldquo;VWP&rdquo;), which is also organized under the laws of Australia.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Our Products, Solutions and Services</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 27.5pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>PB3 PowerBuoy</I><SUP>&reg;</SUP></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 27pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The PB3 generates electricity by harnessing
the renewable energy of ocean waves. The PB3 features a unique onboard power take-off (&ldquo;PTO&rdquo;) system, which incorporates
both energy storage and energy management and control systems. The PB3 generates a nominal name-plated capacity rating of up to
a nominal 3 kilowatts of peak power during recharging of the onboard batteries. Power generation is deployment-site dependent
whereby average power generated can increase substantially at very active sites. Our standard energy storage system (&ldquo;ESS&rdquo;)
has an energy capacity of up to a nominal 150 kilowatt-hours to meet specific application requirements. We believe there is a
substantial addressable market for the current capabilities of our PB3, which we believe could be utilized in a variety of applications.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 22pt">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify; text-indent: 16.5pt">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 27.5pt">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify; text-indent: 16.5pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We believe that using wave energy for electricity
generation has the following potential benefits, compared to existing incumbent solutions.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 90%; 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: 0.5in; text-align: justify"><I>&#9679;</I></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><I>Scalability within a small site area.
    </I>Due to the dense energy in ocean waves, we believe that the electricity may be aggregated to supply electricity to larger
    payloads as a result of multiple PB3 which are placed in an array, occupying a relatively small area. We believe the array
    of a larger number of PB3 could offer end users a variety of advantages in availability, reliability and scalability.</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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"><I>&#9679;</I></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><I>Predictability.</I> The generation of power from
    wave energy can be forecasted several days in advance. Available wave energy can be calculated with a high degree of accuracy
    based on satellite images and meteorological data, even when the wave field is hundreds of miles away and days from reaching
    a PB3. Therefore, we believe end-users relying on PB3 for power may be able to proactively plan their logistics, payload scheduling
    and other operational activities based on such data,</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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"><I>&#9679;</I></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><I>Persistent source of energy.</I> The annual occurrence
    of waves at certain specific sites can be relatively persistent and defined with relatively high accuracy. Based on our studies
    and analyses of various sites of interest, we believe that we will be able to deploy our PB3 in locations where the waves
    could produce usable electricity for the majority of the year.</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 22pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Based on our market research and publicly
available data, including but not limited to the U.S. Department of Energy (&ldquo;DOE&rdquo;) 2019 Powering the Blue Economy
Report, the Westwood Energy World ROV Operations Forecast 2019-2023, and the World Bank Database, we believe that numerous markets
have a direct need for our PB3 including offshore oil and gas, defense and security, science and research, and communications,
as well as government applications in fishery protection. Depending on payload power requirements, sensor types and other considerations,
we have found that our PB3 could satisfy several application requirements within these markets. We believe that the PB3 consistently
generates sufficient power to meet the requirements of many potential customer applications within our target markets, and that
the hybrid could provide ample power in geographies where wave conditions may not be sufficient to allow the PB3 to generate sufficient
power on its own for load center requirements.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>hybrid PowerBuoy&reg;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company has created a hybrid PowerBuoy&reg;
that is a solar powered and liquid-fueled surface buoy, compared to the wave power generating PB3. The hybrid is powered primarily
by solar panels with a liquid-fueled Stirling engine to provide back-up power and is capable of providing reliable power in remote
offshore locations, regardless of ocean wave conditions. We believe this product is complementary to the PB3 by providing the
Company the opportunity to address a broader spectrum of customer deployment needs, including low-wave environments, with the
potential for greater product integration within each customer project. It is primarily intended for shorter term deployment applications
such as electric remotely operated vehicle (&ldquo;eROV&rdquo; or &ldquo;ROV&rdquo;) and autonomous underwater vehicle (&ldquo;AUV&rdquo;)
inspections and short-term maintenance, topside surveillance and communications, and subsea equipment and controls. The hybrid
is anticipated to be a quickly deployable and cost-effective solution. The design has a high payload capacity for communications
and surveillance, with the capability of being tethered to subsea payloads such as batteries, or with a conventional anchor mooring
system. The hybrid generates power from both an array of solar panels and an efficient, clean burning 1kW Stirling engine fueled
by liquid propane (or biofuel for Generation 2). This energy is stored in onboard batteries which power the aforementioned subsea
and topside payloads. The Company has designed the hybrid with a Stirling engine system to outperform traditional diesel buoys,
which we believe have more frequent service and refueling intervals and higher carbon intensities. We believe the hybrid will
be able to operate over a broader range of temperature and ocean wave conditions than existing diesel buoys.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The towable, boat-shaped hull design of the
hybrid is appropriate for deployment around the world. Power is generated independent of wave activity, making it a solution for
providing power through extreme weather and in heaving seas, or in calm, low wave environments and is complimentary to the PB3.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">As with the PB3, the control system uses sensors
and an onboard computer to continuously monitor the hybrid subsystems. We believe that this ability to optimize and manage the
electric power output of the hybrid is a significant advantage of our technology. In the event of extended cloudy periods, the
control system automatically switches electricity generation from the solar panels to the backup engine. However, the load center
(either the on-board payload or one in the vicinity of the hybrid) may continue to receive power from the on-board ESS.
When more suitable solar power generation conditions return, the control system automatically stops the backup up engine and ESS
replenishment recommences by way of solar electricity generation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The hybrid is designed for use with a single
point umbilical and mooring but can be adapted for a 3-point mooring installation for use as a temporary replacement for PB3 installations
during planned maintenance or repairs.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The hybrid is configured with a nominal 30
kilowatt-hours of battery energy storage and approximately 1 megawatt-hour of stored energy in the propane system. While the batteries
are primarily charged through solar power generation, the propane powered Stirling engine system on the hybrid can be considered
reserve energy storage, with propane having a much higher energy storage density than lithium-ion batteries. It can be utilized
when needed based on load demand and will provide approximately 1 megawatt-hour of stored energy capacity. We believe that this
amount of stored energy offers an attractive local, autonomous energy solution for clients in a range of industries, including
but not limited to oil and gas and marine observation, particularly for shorter term deployments.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Subsea Battery</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We have developed a subsea battery that is
complementary to both of our PowerBuoy&reg; products and can be deployed together with our PowerBuoys&reg; or on its own. It offers
customers the option of placing additional modular and expandable energy storage on the seabed near existing or to be installed
subsea equipment. Our lithium ion subsea batteries supply power that can enable subsea equipment, sensors, communications and
AUV and eROV recharge. Our PowerBuoys&reg; 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. Ideal for many remote offshore
customer applications, these subsea batteries are anticipated to be high performance, cost-efficient, and quickly deployable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We believe that the growing demand for electrification
of subsea infrastructure, and an increased switch to autonomous and renewable solution, offers multiple opportunities for deploying
subsea battery powered solutions over the next few years.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Marine Surveillance Solution</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Our Marine Surveillance Solution payload consists
of a high definition radar, gyro-stabilized high definition optical and thermal imaging cameras, vessel automatic identification
system (AIS) detection, and integrated command and control software, paired with our autonomous PB3 PowerBuoy&reg; or hybrid PowerBuoy&reg;
as a power and communications platform. Capabilities include 24/7 vessel tracking &ndash; including dark vessel detection, which
refers to ships that operate primarily at nighttime which do not broadcast an AIS signal &ndash; automatic radar plotting, automated
vessel warnings, and high definition optical and thermal video surveillance capable of providing evidentiary backup of activity
to aid in prosecution.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Data from our Marine Surveillance Solution
is transmitted to shore-based command stations via Wi-Fi, cellular, and/or satellite systems, depending upon location. Surveillance
data can be integrated with readily available marine monitoring software to provide command and control features of a multi-buoy
surveillance network. The data can also be integrated with satellite, terrestrial, and other data feeds to form a detailed surface
and subsea picture of a monitored area.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">A single Marine Surveillance Solution can
monitor more than 1,600 square nautical miles of ocean territory on a permanent or temporary basis, with the ability to seamlessly
link multiple surveillance assets together over large ocean areas giving end-users visibility into potentially damaging environmental
or illegal activities. Customized solutions are also available including the addition of subsea sensors to monitor for acoustic
signatures, tsunami, and water quality.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>3dent Engineering Services</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Through its 3dent Technology subsidiary, the
Company offers a full range of high-level offshore engineering, providing consulting engineering and design services to offshore
wind developers, offshore construction companies, drilling contractors, major oil companies, service companies, and engineering
firms. 3dent&rsquo;s team of dedicated consultants/designers has expertise in structural engineering, hydrodynamics and naval
architecture. Among its services is a focus on addressing the issues current or would-be owners of offshore floaters, jackups,
and liftboats have with their fleet. 3dent Technology services include: simulation engineering, software engineering,
concept design and motion monitoring.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Commercial Activities</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt">&nbsp;</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, with other companies that have developed or are developing in-ocean applications
requiring, and services supporting a persistent source of power that is also capable of real time data collection, processing
and communication, to address potential customer needs.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The table below shows the percentage of customer
revenues that accounted for at least 10% of our consolidated revenues for at least one of the periods indicated:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; text-indent: 27.5pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 36%; text-align: left">Eni S.p.A.</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">11</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">6</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">22</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">10</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Premier Oil UK Limited</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">4</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">11</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>EGP</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">70</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">93</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">63</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">68</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>ACET</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">10</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">6</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt">Other</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">9</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">0</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">5</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">11</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">100</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">%</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">100</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">%</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">100</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">%</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">100</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">%</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; text-indent: 27.5pt">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Customers</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</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: 0.5in; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In November 2020, the Company entered
    into an agreement with the OOC under which the Company will provide engineering and technical services for a new project under
    the DeepStar Global Technology Consortium Program</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In October 2020, the Company entered into an agreement
    with ACET to conduct a feasibility study for the evaluation of a PB3 PowerBuoy&reg; power and 5G communications solution in
    support of the U.S. Navy Naval Postgraduate School&rsquo;s SLAMR.</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In March 2020, Eni exercised their option from the
    March 2018 contract to extend their lease of the PB3 for an additional 18 months. The initial provision in the March 2018
    agreement provided for a minimum 24-month contract that included an 18-month PB3 lease and associated project management.
    In November 2020, Eni retrieved the PB3 and returned it to shore due to a mooring issue. The Company is working with Eni to
    address a variety of possible next steps with the contract.</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In September 2019, we entered into two contracts
    with subsidiaries of EGP which include the sale of a PB3 PowerBuoy&reg; and the development and supply of a turn-key integrated
    Open Sea Lab that will be the Company&rsquo;s first deployment off the coast of Chile. Due to the COVID-19 pandemic, the Company
    declared force majeure in April 2020. In June 2020 the Company signed a contract amendment to delay the deployment of its
    PB3 PowerBouy&reg; in Chile from May 2020 to September 2020 due to travel restrictions imposed by the U.S. and Chile in response
    to COVID-19 pandemic. In October 2020, the Company signed another contract amendment to delay the deployment of its PB3 PowerBouy&reg;
    in Chile from September 2020 to December 2020 due to travel restrictions imposed by the U.S. and Chile in response to COVID-19
    pandemic. The Company is working with EGP to establish a new deployment date. The contract is a result of a detailed feasibility
    study of the PowerBuoy&reg; as an offshore autonomous platform hosting oceanographic sensor systems conducted in September
    2018.</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In April 2019, we entered into an agreement with
    a leading oil and gas operator to conduct a detailed feasibility study of using the Company&rsquo;s technology to monitor
    subsea wells.</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In February 2019, we entered into a contract with
    the U.S. Navy to carry out the first phase of a project to design and develop a buoy mooring system which incorporates fiber
    optics for the transmission of subsea sensor data to airplanes, ships, and satellites.</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In June 2018, we entered into a contract with Premier
    Oil Plc. (&ldquo;PMO&rdquo;) for the lease of a PB3 to be deployed in one of PMO&rsquo;s offshore fields in the North Sea.
    In March 2020, after the several months at sea, the PB3 was decommissioned and returned to New Jersey for evaluation and refurbishment
    to prepare for another deployment.</TD></TR>
</TABLE>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;&nbsp;</P>

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

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></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 COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif"><I>Partnerships</I></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In February 2020, we signed a letter of intent with
    Taiwan-based BAP Precision, Inc. (&ldquo;BAP&rdquo;) to provide PowerBuoy<SUP>&reg;</SUP> joint surveillance solutions for
    government agency contract pursuits for policing territorial waters.</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In May 2019, we signed a memorandum of understanding
    with Modus Seabed Intervention Ltd. (&ldquo;Modus&rdquo;). for the purpose of developing and delivering commercial market
    solutions that offer a step-change in innovation and market value against conventional <FONT STYLE="letter-spacing: -0.15pt">methodologies,
    specifically</FONT> through development and marketing of a combined Hybrid AUV charging station which will be able to utilize
    the PowerBuoy&reg; system for topside charging and communications.</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In April 2019, we signed a memorandum of understanding
    with Acteon Field Life Service Ltd. (&ldquo;Acteon&rdquo;) to develop, explore and exploit mutual opportunities in the global
    oil and gas and renewable markets.</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&#9679;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">In January 2019, we entered into a Joint System
    Solution Development and Marketing Agreement with Saab Seaeye Ltd. (&ldquo;Saab&rdquo;). The agreement anticipates a preliminary
    focus on AUV and eROV charging and communications systems.</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 45pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"><B>Business Strategy</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In fiscal 2021, we have continued progress
in marketing our products and solutions. We have made progress in transitioning from R&amp;D to a commercialization focus with
SELL, BUILD, SHIP as our motto and we intend to build on our success by implementing processes and solutions that cover the entire
life cycle, from demand generation to close of contract, and from channel strategies to customer care.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">A majority of the Company&rsquo;s opportunities
with potential customers have been for projects in Western Europe, including the North Sea, as well as North America and Asia.
Nearly two-thirds of these opportunities have progressed past the initial feasibility and non-disclosure agreement stage to more
detailed, confidential discussions around specific customer applications. Many of these discussions occur at the executive, decision-making
level, as well as the implementation level.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify; text-indent: 30.8pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Many proposal requests are for projects where
one of our PowerBuoys&reg; products, either the PB3, the hybrid, or our subsea battery solution is part of a larger solution deployment,
and typically include the potential lease or sale of one or more PowerBuoys&reg;, as well as required services and maintenance
support. A majority of hybrid inquiries are for shorter term deployments and in calmer waters. Historically, demonstration projects
have been a necessary step toward broad solution deployment and revenues associated with specific applications. A proposal phase
typically lasts from three months to more than one year. During the demonstration project specification, negotiation and evaluation
period, we are often subject to the prospective customer&rsquo;s vendor qualification process, which entails substantial due diligence
of our company and capabilities and may include negotiation of standard terms and conditions. Many proposals contain provisions
which would mandate the sale or lease of our PowerBuoy&reg; product upon successful conclusion of the demonstration project.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We believe this is an accurate depiction of
the overall sales cycle for new technology in each of our target markets, including our products and solutions. Cycle times for
each step of the sales cycle will vary depending on several customer factors, including, but not limited to, technical evaluation,
project priorities, project funding approval process, and alignment of new technology integration with the customer&rsquo;s broader
operational strategy. We believe that potential demand, vis-&agrave;-vis specific application proposal requests, is indicative
of significant progress in our commercialization strategy. We believe in the potential for growth as a result of our positioning
for higher volume production of our products and solutions and their initial indications of demand for our products and solutions
in multiple customer applications.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white">We continue to commercialize
our products and solutions for use in remote offshore power and real-time data communications applications, and in order to achieve
this goal, we are pursuing the following business objectives:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify">&nbsp;</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; width: 0.25in">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 0.25in; text-align: justify"><FONT STYLE="font-size: 10pt"><I>&#9679;</I></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt"><I>Integrated
    turn-key solutions sales or leases incorporating our products and services.</I> We believe our PB3, hybrid PowerBuoys&reg;
    and our subsea battery solutions, as well as our Marine Surveillance Solution are well suited to enable many unmanned, autonomous
    (non-grid connected) offshore applications, such as topside and subsea surveillance and communications, subsea equipment monitoring,
    early warning systems platform and subsea power and buffering, and weather and climate data collection. We have investigated
    and realized market demand for some of these solutions as sales and leases within our selected markets, and we intend to sell
    and lease our products to these markets as part of these broader integrated solutions. Additionally, we intend to provide
    services associated with our solution offerings such as paid engineering studies, value-added engineering, maintenance, remote
    monitoring and diagnostics, application engineering, planning, training, project management, and marine and logistics support
    required for our solution life-cycle. We also intend to pursue turn-key projects where we take on a prime contractor role
    to capture broader revenue opportunities while ensuring that solutions effectively address customer needs. We continue to
    increase our commercial capabilities through new hires in sales and application support, and through engagement of expert
    market consultants in various geographies. </FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&#9679;</I></P></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><I>Expand customer
    system solution offerings through new complimentary products that enable shorter and more cost-efficient deployments.</I>
    We completed the design and construction of the hybrid PowerBuoy&reg; in 2020. This product builds on our existing expertise
    in offshore power systems. The hybrid PowerBuoy&reg; is a solar powered buoy with a liquid-fueled Stirling engine as backup.
    The hybrid is to be highly complementary to the PB3 PowerBuoy&reg; by providing the Company the opportunity to address a broader
    spectrum of customer deployment needs, including low-wave environments, with the potential for greater system integration
    within each customer project. The hybrid is primarily intended for shorter term deployment applications such as eROV and AUV
    inspections and short-term maintenance, topside surveillance and communications, and subsea equipment and controls. The Company
    has also developed a subsea battery system that is complimentary to the Company&rsquo;s PowerBuoy&reg; 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 recharging of AUVs and eROV. Ideal for many remote offshore customer applications, these subsea
    battery systems are anticipated to be safe, high performance, cost-efficient, and quickly deployable.</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt"><I>&#9679;</I></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><I>Concentrate sales and marketing
    efforts in specific geographic markets. </I>We are currently focusing our marketing efforts on parts of North and South America,
    Europe, Asia and Western Africa. We believe that each of these areas has demand for our solutions, sizable end market opportunities,
    political and economic stability, and high levels of industrialization and economic development.We have opened an office in
    Houston, Texas to further support our customers and strengthen our dialogue with our solution partners.</TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt"><I>&#9679;</I></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><I>Expand our relationships
    in key market areas through strategic partnerships and collaborations.</I> We believe that strategic partners are an important
    part of commercializing a new product. 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 believe that offering a turn-key solution, and not just power, is key to securing long term success. We have
    formed such a relationship with several well-known groups, including Mackay, BAP, Modus, Saab and Acteon. We continue to seek
    other opportunities to collaborate with application experts from within our selected markets.</TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&#9679;</I></P></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt"><I>Outsourcing
    of fabrication, deployment and service support</I>. We outsource all fabrication, anchoring, mooring, cabling supply, and
    in most cases deployment of our products and solutions in order to minimize our capital requirements as we scale our business.
    Our PTO is a proprietary subsystem and is assembled and tested at our facility. We believe this distributed manufacturing
    and assembly approach enables us to focus on our core competencies to ensure a cost-effective offering by leveraging a larger
    more established supply base. We also continue to seek strategic partnerships with regard to servicing of our products and
    solutions.</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&#9679;</I></P></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt"><I>Cost
    reduction and solution development.</I> Our engineering efforts are mainly focused on addressing customer solutions; product
    and solution sales; reducing costs associated with production, installation and product life-cycle costs; and improving the
    energy output, reliability, maintenance interval and expected operating life of our products and solutions. We continue to
    optimize manufacturability of our designs with a focus on cost competitiveness, and we believe we will be able to address
    new applications by developing new payloads and solutions that address customer needs.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Through its 3dent Technology subsidiary, the
Company plans to expand its customer base by providing consulting engineering and design services to offshore wind developers,
offshore construction companies, drilling contractors, major oil companies, service companies, and engineering firms with the
intention of increasing the Company&rsquo;s revenue base.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company is pursuing a long-term growth
strategy to expand its market value proposition while building the Company&rsquo;s revenue base. This strategy includes partnerships
with leading companies in adjacent and complementary markets.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Liquidity</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
consolidated financial statements have been prepared assuming the Company will continue as a going concern. The Company has
experienced recurring losses from operations, and has used net cash in operating activities of approximately $8.5 million
through nine months ended January 31, 2021 and approximately $10.5 million for the fiscal year ended April 30, 2020, all of
which have contributed to an accumulated deficit of $229.7 million as of January 31, 2021. These factors raise substantial
doubt about the Company&rsquo;s ability to continue as a going concern. As of January 31, 2021, based in large part on the
equity raises discussed below, the Company had approximately $79.8 million in unrestricted cash and cash equivalents on hand.
Based on the Company&rsquo;s current unrestricted cash and cash equivalents, the Company believes that it will be able to
finance its capital requirements and operations for at least the next 12 months from the date of this Report. The Company
expects to continue to fund our business with sales of our securities and through generating revenue with customers. The
Company cannot provide assurances that it will be able to secure additional funding when needed or at all, or, if secured,
that such funding would be on favorable terms. The Company also cannot provide assurances that it will generate sufficient
revenue from customers to fund our business.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><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: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
key goal for the Company this year was to bolster its financial position, improve its liquidity and reduce its capital risk.&nbsp;
During the fiscal year, the Company has generated $76.1 million in net proceeds through utilization of the 2019 ATM Facility (as
defined below), the 2020 ATM Facility (as defined below) and the purchase agreement with Aspire Capital, including $66.7 in net
proceeds raised during the third quarter.&nbsp; Additionally, the Company&rsquo;s liquidity position has improved due to cost
cutting measures that were put in place at the beginning of the year.&nbsp; The Company believes that its unrestricted cash balance
of approximately $79.8 million as of January 31, 2021, in addition to continued prudent cost management, will provide it with
the capital necessary to fund ongoing operations as well as the financial flexibility to execute on its growth strategy, consisting
of market expansion, sales cycle acceleration, development of new products and solutions, and strategic acquisitions.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Capital Raises</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>At the Market Offering Agreements</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On January 7, 2019, the Company entered into
an At the Market Offering Agreement with AGP (&ldquo; the 2019 ATM Facility&rdquo;) under which the Company
may issue and sell to or through AGP, acting as agent and/or principal, shares of the Company&rsquo;s common stock having an aggregate
offering price of up to $25.0 million. From inception of the program through its termination on December 8, 2020, under
the 2019 ATM Facility, the Company sold and issued 17,595,472 shares of its common stock with an aggregate market value of $23.4
million at an average price of $1.33 per share, including 12,342,506 shares in fiscal year 2021 with an aggregate market value
of $18.7 million at an average price of $1.51 per share and paid AGP a sales commission of approximately $0.8 million related
to those shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On November 20, 2020, the Company entry into
a new At the Market Offering Agreement with AGP (the &ldquo;2020 ATM Facility&rdquo;). The Company on December 4, 2020 filed
a prospectus with the Securities and Exchange Commission whereby, the Company may issue and sell to or through AGP, acting
as agent and/or principal, shares of the Company&rsquo;s common stock having an aggregate offering price of up to $50.0 million.
From inception of the 2020 ATM Facility through January 31, 2021, the Company sold and issued 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. The dollar amount reported in the prospectus filing is fully
utilized.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Equity Line Common Stock Purchase Agreements</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On October 24, 2019, the Company entered into
a common stock purchase agreement with Aspire Capital which provided that, subject to certain terms, conditions and limitations,
Aspire Capital is committed to purchase up to an aggregate of $10.0 million of shares of the Company&rsquo;s common stock over
a 30-month period. Through September 18, 2020, the Company has sold 6,424,205 shares of common stock with an aggregate market
value of $4.0 million at an average price of $0.63 per share pursuant to this common stock purchase agreement, including 5,025,000
shares in fiscal year 2021 with an aggregate market value of $2.9 million at an average price of $0.57 per share. The agreement
was fully utilized and terminated on September 18, 2020.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On September 18, 2020, the Company
entered into a new common stock purchase agreement with Aspire Capital which provided that, subject to certain terms,
conditions and limitations, Aspire Capital is committed to purchase up to an aggregate of $12.5 million of shares of the
Company&rsquo;s common stock over a 30-month period that does not exceed 19.99% of the outstanding common stock on the date
of the agreement. The number of shares the Company could issue within the 19.99% limit is 3,722,251 shares without
shareholder approval. Shareholder approval was received at the Company&rsquo;s annual meeting of shareholders on December
23, 2020 for the sale of 9,864,706 additional shares of common stock which is over the 19.99% limit of the outstanding common
stock. Through January 31, 2021, the Company has sold an aggregate of 2,250,000 shares of common stock with an aggregate
market value of $7.4 million at an average price of $3.28 per share pursuant to this common stock purchase agreement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white">The sale of additional
equity or convertible securities could result in dilution to our stockholders. 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. We do not have any committed sources of debt or equity financing and
we cannot assure you that financing will be available in amounts or on terms acceptable to us when needed, 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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Backlog</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">As of January 31, 2021, the Company&rsquo;s
backlog was $0.5 million. As of April 30, 2020, backlog was $1.0 million. Our backlog can include unfilled firm orders for our
products and services from commercial or governmental customers. If any of our contracts were to be terminated, our backlog would
be reduced by the expected value of the remaining terms of such contract.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B></B>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Critical Accounting Policies and Estimates</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">To understand our financial statements, it
is important to understand our critical accounting policies and estimates. We prepare our financial statements in accordance with
GAAP. 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&rsquo;s judgments and estimates.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">For a discussion of our critical accounting
estimates, see the section entitled Item 7.- &ldquo;Management&rsquo;s Discussion and Analysis of Financial Condition and Results
of Operations&rdquo; in our Annual Report on Form 10-K for the year ended April 30, 2020. There were no material changes in our
critical accounting estimates or accounting policies during the nine months ended January 31, 2021.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Recently Issued Accounting Standards</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">See Note 2 of the Notes to Consolidated Financial
Statements.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Financial Operations Overview</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 23.1pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Revenues</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 11pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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&rsquo;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&rsquo;s forecast of the total cost to satisfy the performance obligation
plus an appropriate profit margin.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The nature of the Company&rsquo;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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; color: red">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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&rsquo;s
services. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the
services to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of
progress against the performance obligations incorporated within the contractual agreements. When the Company&rsquo;s estimate
of total costs to be incurred to satisfy the performance obligations exceed revenue, the Company recognizes the loss immediately.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company&rsquo;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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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&rsquo;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&rsquo;s business. For each of the nine-month periods ended January 31, 2021 and 2020, all of
the Company&rsquo;s contracts were classified as firm fixed price.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The following table provides information regarding
the breakdown of our revenues by customer for the three and nine months ended January 31, 2021 and 2020.</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="14" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: right">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 36%; text-align: left">Eni S.p.A. </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">34</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">42</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">135</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">118</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Premier Oil UK Limited </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">5</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">27</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">126</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>EGP </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">223</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">678</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">379</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">774</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>ACET </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">33</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">37</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 1.5pt">Other </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">27</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">26</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">113</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">317</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">725</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">604</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">1,131</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

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


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    <DIV STYLE="break-before: page; margin-top: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We currently focus our sales and marketing
efforts on parts of North and South America, Europe, Asia and Western Africa. The following table shows the percentage
of our revenues by geographical location of our customers for the nine months ended January 31, 2021 and 2020.</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 80%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold; border-bottom: Black 1.5pt solid">Customer Location</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2019</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 60%">Europe </TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 16%; text-align: right">27</TD><TD STYLE="width: 1%; text-align: left">%</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 16%; text-align: right">25</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">South America </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">63</TD><TD STYLE="text-align: left">%</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">69</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">North America </TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">10</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">6</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">100</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">%</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">100</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">%</TD></TR>
</TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Cost of revenues</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Our cost of revenues consists primarily of
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 products supplied by third-party suppliers.
Cost of revenues also includes product system delivery and deployment expenses and may include anticipated losses at completion
on certain contracts.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Our ability to generate a gross profit will
depend on the nature of future contracts, our success at generating revenues through sales or leases of our products, the nature
of our contracts generating revenues to fund our product development efforts, and our ability to manage costs incurred on fixed
price commercial contracts.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Engineering and product development costs</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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&reg; system, and to the development of new products, product applications and complementary
technologies. We expense all of our engineering and product development costs as incurred.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Selling, general and administrative costs</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Interest income, net</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Interest income, net consists of interest
received on cash, cash equivalents and money market fund and interest paid on certain obligations to third parties.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Foreign exchange gain (loss)</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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 US dollars and our functional currency is the US dollar, our main foreign exchange
exposure, if any, results from changes in the exchange rate between the US dollar and the British pound sterling, the Euro and
the Australian dollar.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We maintain cash accounts that are denominated
in British pounds sterling, Euros and Australian dollars. These foreign-denominated accounts had a balance of $0.3 million as
of January 31, 2021 and as of January 31, 2020, compared to our total cash, cash equivalents and restricted cash balances of $80.4
million as of January 31, 2021 and $10.8 million as of January 31, 2020. These foreign currency balances are translated each month
into our functional currency, the US dollar, and any resulting gain or loss is recognized in our results of operations.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In addition, a portion of our operations is
conducted through our subsidiaries in countries other than the United States, specifically Ocean Power Technologies Ltd. in the
United Kingdom, the functional currency of which is the British pound sterling, and Ocean Power Technologies (Australasia) Pty
Ltd. in Australia, the functional currency of which is the Australian dollar. Both of these subsidiaries have foreign exchange
exposure that results from changes in the exchange rate between their functional currency and other foreign currencies in which
they conduct business.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Results of Operations</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">This section should be read in conjunction
with the discussion below under &ldquo;Liquidity and Capital Resources.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B><I>Three months ended January 31, 2021
compared to the three months ended January 31, 2020</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The following table contains selected statement
of operations information, which serves as the basis of the discussion of our results of operations for the three months ended
January 31, 2021 and 2020.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">% change</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Three months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding-bottom: 1.5pt; font-weight: bold; text-align: center">2021 period to</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020 period</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="6" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 52%">Revenues</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">317</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">725</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">-56</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt">Cost of revenues</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">698</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">681</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">2</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt">Gross profit/(loss)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(381</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">44</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Operating expenses:</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">Engineering and product development costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,019</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">896</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">14</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt">Selling, general and administrative costs</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">1,763</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">2,093</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">-16</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 20pt; text-align: left; padding-bottom: 1.5pt">Total operating expenses</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">2,782</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">2,989</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Operating loss</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(3,163</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(2,945</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Interest income, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">25</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">27</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-7</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Other expense, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(16</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-100</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Foreign exchange gain/(loss)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">3</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(1</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-400</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Net loss</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(3,151</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(2,919</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">8</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">%</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Revenues</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Revenues for the three months ended January
31, 2021 and 2020 were $0.3 million and $0.7 million, respectively. The decrease of $0.4 million of revenue for the three months
ended January 31, 2021 was primarily due to lower revenue derived from our EGP project as compared to the same period in the prior
year.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Cost of revenues</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Cost of revenues for the three months ended
January 31, 2021 and 2020 were $0.7 million and $.0.7 million, respectively. Spending was lower for the three months ended January
31, 2021 mostly offset by an increase in reserve for future loss on contracts as compared to the same period in the prior year.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Engineering and product development costs</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Engineering and product development costs
for the three months ended January 31, 2021 and 2020 were $1.0 million and $0.9 million, respectively. The increase of approximately
$0.1 million is the result of higher spending on new product development projects as compared to the same period in the prior
year.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; color: #333333">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Selling, general and administrative costs</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Selling, general and administrative costs
for the three months ended January 31, 2021 and 2020 were $1.8 million and $2.1 million, respectively. The decrease of $0.3 million
of spending for the three months ended January 31, 2021 was primarily due to lower employee related costs and selling and marketing
costs.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; color: #333333">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Interest income, net</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Interest income, net during the three months
ended January 31, 2021 was $25,000, compared to $27,000 during the three months ended January 31, 2020. The decrease of $2,000
is due to a lower interest rate earned on investments in the three months ended January 31, 2021 as compared to the three months
ended January 31, 2020.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Other expense, net</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Other expense, net during the three months
ended January 31, 2021 was $16,000 as compared to zero during the nine months ended January 31, 2020. The increase of $16,000
is due to the write-off of unused expense related to potential capital raises as compared to the three months ended January
31, 2020.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Foreign exchange gain/(loss)</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Foreign exchange gain during the three months
ended January 31, 2021 was $3,000 compared to a foreign exchange loss of $1,000 during the three months ended January 31, 2020.
The difference was attributable primarily to the relative change in value of the British pound sterling, Euro and Australian dollar
compared to the US dollar during the two periods.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B><I>Nine months ended January 31, 2021 compared
to the nine months ended January 31, 2020</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The following table contains selected statement
of operations information, which serves as the basis of the discussion of our results of operations for the nine months ended
January 31, 2021 and 2020.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">% change</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">Nine months ended January 31,</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding-bottom: 1.5pt; font-weight: bold; text-align: center">2021 period to</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2021</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1.5pt solid">2020 period</TD><TD STYLE="padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="6" STYLE="text-align: center">(in thousands)</TD><TD>&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 52%">Revenues</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">604</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">1,131</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 12%; text-align: right">-47</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt">Cost of revenues</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">1,248</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">1,335</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">-7</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left; padding-bottom: 1.5pt">Gross loss</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(644</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(204</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Operating expenses:</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 10pt; text-align: left">Engineering and product development costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">3,334</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">3,403</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-2</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 10pt; text-align: left">Selling, general and administrative costs</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">5,591</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">5,629</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-1</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 20pt; text-align: left; padding-bottom: 1.5pt">Total operating expenses</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">8,925</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">9,032</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Operating loss</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(9,569</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(9,236</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Gain due to the change in fair value of warrant liabilities</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">6</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-100</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Interest income, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">45</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">102</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-56</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Other expense, net</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">(49</TD><TD STYLE="text-align: left">)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-100</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Foreign exchange gain/(loss)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">13</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">(5</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: right">-360</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Net loss</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(9,560</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">(9,133</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">5</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">%</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Revenues</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Revenues for the nine months ended January
31, 2021 and 2020 were $0.6 million and $1.1 million, respectively. The decrease of $0.5 million of revenue for the nine months
ended January 31, 2021 was primarily due to lower revenue derived from projects with EGP, Premier Oil and U.S. Navy.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Cost of revenues</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Cost of revenues for the nine months ended
January 31, 2021 and 2020 were $1.2 million and $1.3 million, respectively. The decrease of $0.1 million in cost of revenue
is due to more costs incurred on our Premier Oil and U.S. Navy projects in the prior year mostly offset by costs incurred on our
EGP project in the current year.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Engineering and product development costs</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Engineering and product development costs
for the nine months ended January 31, 2021 and 2020 were $3.3 million and $3.4 million, respectively. The decrease of approximately
$0.1 million is the result of lower spending on new product development projects as compared to the same period in the prior year.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Selling, general and administrative costs</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Selling, general and administrative costs
for the nine months ended January 31, 2021 and 2020 were $5.6 million and $5.6 million, respectively. Spending was essentially
flat for the three months ended January 31, 2021 versus the same period in the prior year as the increase in the estimated
penalty payment of $0.2 million relating to the Spanish tax audit was offset by lower spending for sales and marketing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; color: #333333">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Gain due to the change in fair value of
warrant liabilities</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The change in fair value of warrant liabilities
during the nine months ended January 31, 2021 was zero versus an unrealized gain of $6,000 for the nine months ended January 31,
2020.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Interest income, net</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Interest income, net during the nine months
ended January 31, 2021 was $45,000 as compared to $102,000 during the nine months ended January 31, 2020. The decrease of $57,000
is due to a lower interest rate earned on investments in the nine months ended January 31, 2021 as compared to the nine months
ended January 31, 2020.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Other expense, net</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Other expense, net during the nine months
ended January 31, 2021 was $49,000 as compared to zero during the nine months ended January 31, 2020. The increase of $49,000
is due to the write-off of unused expense related to potential capital raises as compared to the nine months ended January
31, 2020.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><I>Foreign exchange gain/(loss)</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Foreign exchange gain during the nine months
ended January 31, 2021 was $13,000 compared to a foreign exchange loss of $5,000 during the nine months ended January 31, 2020.
The difference was attributable primarily to the relative change in value of the British pound sterling, Euro and Australian dollar
compared to the US dollar during the two periods.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Liquidity and Capital Resources</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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 $9.6 million and $9.1 million
for the nine months ended January 31, 2021 and 2020, respectively. Refer to &ldquo;Liquidity Outlook&rdquo; below for additional
information.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Net cash used in operating activities</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">During the nine months ended January 31, 2021,
net cash flows used in operating activities was $8.5 million, a decrease of $0.1 million compared to net cash used in operating
activities during the nine months ended January 31, 2020. This decrease is mainly the result of a higher net loss, offset
by lower cash spending on customer projects and product development and lower selling, general and administration costs in
the nine months ended January 31, 2021 as compared to the same period in the prior fiscal year.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Net cash used in investing activities</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Net cash used in investing activities during
the nine months ended January 31, 2021 was $17,000, a decrease of $44,000 compared to net cash used by investing activities during
the nine months ended January 31, 2020. The decrease in net cash used in investing activities was due to lower spending on the
purchase of property, plant and equipment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Net cash provided by financing activities</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 293.25pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Net cash provided by financing activities
during the nine months ended January 31, 2021 was approximately $78.0 million compared to net cash provided by financing activities
during the nine months ended January 31, 2020 of $2.4 million. The increase in net cash provided by financing activities during
the nine months ended January 31, 2021 is primarily due to increased proceeds from capital raises of $76.1 million, $0.8
million from proceeds associated with warrant and stock option exercises, $0.9 million received from the PPP loan and $0.2 million
in a financing loan payable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Effect of exchange rates on cash and cash
equivalents</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The effect of exchange rates on cash and cash
equivalents was an increase of $33,000 in the nine months ended January 31, 2021 and a decrease of $15,000 in the nine months
ended for January 31, 2020. 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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><B>Liquidity Outlook</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Our consolidated financial statements
have been prepared assuming we will continue as a going concern. The Company has experienced recurring losses from operations,
and has used net cash in operating activities of approximately $8.5 million through nine months ended January 31, 2021 and
approximately $10.5 million for the fiscal year ended April 30, 2020, all of which have contributed to an accumulated deficit
of $229.7 million at January 31, 2021. As of January 31, 2021, based in large part on the equity raises described under &ldquo;&ndash;
Capital Raises&rdquo;, the Company had approximately $79.8 million in unrestricted cash and cash equivalents on hand. Based
on the Company&rsquo;s current unrestricted cash and cash equivalents and its ability to raise additional equity under
facilities currently in place, the Company believes that it will be able to finance its capital requirements and operations for
at least the next 12 months. Among other things, the Company is currently evaluating a variety of different financing alternatives
and we expect to continue to fund our business with sales of our securities and through generating revenue with customers. These
conditions raise substantial doubt about our ability to continue as a going concern.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">A
key goal for the Company this year was to bolster its financial position, improve its liquidity and reduce its capital risk.&nbsp;During
the fiscal year, the Company has generated $76.1 million in net proceeds through utilization of the 2019 ATM Facility as defined
under &ldquo;-Capital Raises&rdquo; above, 2020 ATM Facility as defined under &ldquo;-Capital Raises&rdquo; above, and the purchase
agreement with Aspire Capital, including $66.7 in net proceeds raised during the third quarter.&nbsp; Additionally, the Company&rsquo;s
liquidity position has improved due to cost cutting measures that were put in place at the beginning of the year.&nbsp;The Company
believes that its unrestricted cash balance of approximately $79.8 million as of January 31, 2021, in addition to continued prudent
cost management, will provide it with the capital necessary to fund ongoing operations as well as the financial flexibility to
execute on its growth strategy, consisting of market expansion, sales cycle acceleration, development of new products and solutions,
and strategic acquisitions.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 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: 0; text-align: justify"><FONT STYLE="font-size: 10pt">We expect to
devote substantial resources to continue our development efforts of our products and to expand our sales, marketing and manufacturing
programs associated with the continued commercialization of the PowerBuoys&reg;. Our future capital requirements will depend on
a number of factors, including but not limited to:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="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">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 0.5in; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">the
    impact of COVID-19 pandemic on our business, operations, customers, suppliers and manufacturers;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    ability to commercialize our products, and achieve and sustain profitability;</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="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;</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    ability to obtain additional funding, as and if needed which will be subject to a number of factors, including market conditions,
    and our operating performance;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    ability to continue as a going concern;</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; vertical-align: top"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">our
                                         ability to successfully integrate acquisitions, including our recent acquisition of 3dent
                                         Technology, LLC;</FONT></P></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; vertical-align: top"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><P STYLE="text-align: justify; margin-top: 0; margin-bottom: 0"><FONT STYLE="font-size: 10pt">our
                                         estimates regarding expenses, future revenues and capital requirements;&nbsp;</FONT></P></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><P STYLE="text-align: justify; margin-top: 0; margin-bottom: 0"><FONT STYLE="font-size: 10pt">the
                                         adequacy of our cash balances and our need for additional financings;&nbsp;</FONT></P></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; vertical-align: top"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">our
                                         ability to develop and manufacture commercially viable products;&nbsp;</FONT></P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="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">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 0.5in"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: -1.2pt"><FONT STYLE="font-size: 10pt">&#9679;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: -1.2pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    ability to successfully develop and market new products and solutions, such as the subsea battery and Marine Surveillance
    Solution;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">that
    we will be successful in our efforts to commercialize our products or the timetable upon which commercialization can be achieved,
    if at all;</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    ability to identify and penetrate markets for our products and solutions;</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    ability to implement our commercialization strategy as planned, or at all;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    ability to improve the power output, survivability and reliability of our products;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    relationships with our strategic partners may not be successful and we may not be successful in establishing additional relationships;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">the
    reliability of our technology and our products and solutions;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    ability to improve the power output, survivability and reliability of our products;</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    ability to raise capital through our current equity facilities;</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">the
    impact of pending and threatened litigation on our business, financial condition and liquidity;</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">changes in current legislation, regulations
    and economic conditions that affect the demand for renewable energy;</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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">our ability to compete effectively in our
    target markets;</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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    limited operating history and history of operating losses;</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">our
    sales and marketing capabilities and strategy in the United States and internationally; and</FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">our
                                         ability to protect our intellectual property portfolio.&nbsp;</FONT></P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">Our business
is capital intensive and to date, we have been funding our business principally through sales of our securities, and we expect
to continue to fund our business with sales of our securities and, to a limited extent, with our revenues until, if ever, we generate
sufficient cash flow to internally fund our business. This is largely a result of the high product development costs associated
with our product development. We anticipate that our operating expenses will be approximately $14.0 million in fiscal 2021 including
expected savings from cost reduction initiatives and engineering and product development spending of more than $6.9 million. We
cannot assure you that we will be able to increase our revenues and cash flow to a level which would support our operations. Further,
we cannot assure you that we will be able to secure additional financing or raise additional capital or, if we are successful
in our efforts to raise additional capital, of the terms and conditions upon which any such financing would be extended. If we
are unable to raise additional capital when needed or generate positive cash flow, it is unlikely that we will be able to continue
as a going concern. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt"><B>Off-Balance
Sheet Arrangements</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">Since inception,
we have not engaged in any off-balance sheet financing activities.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="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: 0.6in"><FONT STYLE="font-size: 10pt"><B>Item 3.</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><B><A NAME="pri_002"></A>QUANTITATIVE AND
    QUALITATIVE DISCLOSURES ABOUT MARKET RISK</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">Not applicable.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="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: 0.6in"><FONT STYLE="font-size: 10pt"><B>Item 4.</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><B><A NAME="pri_003"></A>CONTROLS AND PROCEDURES</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt"><I>Evaluation
of Disclosure Controls and Procedures</I></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="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 January 31, 2021 pursuant to Rules 13a-15(b) or 15d-15(b)
of the Securities Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;). 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&rsquo;s (&ldquo;SEC&rdquo;) rules and forms.
Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required
to be disclosed by us in the reports that we file under the Exchange Act is accumulated and communicated to our management, as
appropriate, to allow timely decisions regarding required disclosure. Based on such evaluation, management concluded that our
disclosure controls and procedures were effective as of January 31, 2021 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&rsquo;s rules and forms.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt"><I>Changes in
Internal Control over Financial Reporting</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">No change in
our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during
the fiscal quarter ended January 31, 2021 that has materially affected, or is reasonably likely to materially affect, our internal
control over financial reporting.</FONT></P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 10pt"><B><A NAME="pri_004"></A>PART
II &mdash; OTHER INFORMATION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="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: 0.6in"><FONT STYLE="font-size: 10pt"><B>Item 1.</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt"><B><I><A NAME="pri_005"></A>LEGAL
                                         PROCEEDINGS&nbsp;</I></B></FONT></P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><FONT STYLE="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.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><FONT STYLE="font-size: 10pt">For
information on matters in dispute, see Note 15 to the Consolidated Financial Statements in our Annual Report on Form10-K for the
year ended April 30, 2020, and Note 16 to the Consolidated Financial Statements under Part I, Item 1 of this report.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"><FONT STYLE="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: 0.6in"><FONT STYLE="font-size: 10pt"><B>Item 1A.</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><B><I><A NAME="pri_006"></A>RISK FACTORS</I></B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="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, 2020 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 June 29, 2020.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt"><B><I>Our auditors
have raised substantial doubts as to our ability to continue as a going concern.</I></B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">Our consolidated
financial statements have been prepared assuming we will continue as a going concern. Due to the significant product development
costs associated with our business and operations, we have experienced recurring losses from operations, and has used net cash
in operating activities of approximately $8.5 million through nine months ended January 31, 2021 and approximately $10.5 million
for the fiscal year ended April 30, 2020, all of which have contributed to an accumulated deficit of $229.7 million as of
January 31, 2021. As of January 31, 2021, based in part on equity raises, the Company had approximately $79.8 million in
unrestricted cash and cash equivalents cash on hand. Based on the Company&rsquo;s unrestricted cash and cash equivalents
balances, and its ability to raise additional equity under facilities currently in place, the Company believes that it will be
able to finance its capital requirements and operations for at least the next 12 months from the date of this Report.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">We continue
to experience operating losses and currently have only two revenue producing contracts. During fiscal 2020, our net burn rate
(cash used in operations less cash generated by operations) including engineering and product development spending was approximately
$0.9 million per month.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">We have been
funding our business principally through sales of our securities, and we expect to continue to fund our business with sales of
our securities and, to a limited extent, with our revenues until, if ever, we generate sufficient cash flow to internally fund
our business. These factors, among others, raise substantial doubt about our ability to continue as a going concern. Our consolidated
financial statements do not include any adjustments that might result from the outcome of this uncertainty. We anticipate that
our operating expenses will be approximately $14.0 million in fiscal 2021 including expected savings from cost reduction initiatives
and engineering and product development spending of more than $6.9 million. We cannot assure you that we will be able to increase
our revenues and cash flow to a level which would support our operations. Further, we cannot assure you that we will be able to
secure additional financing or raise additional capital or, if we are successful in our efforts to raise additional capital, of
the terms and conditions upon which any such financing would be extended. If we are unable to meet our obligations, we would be
forced to cease operations, in which event investors would lose their entire investment in our company.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt"><B><I>&nbsp;</I></B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">We have incurred
net losses since we began operations in 1994, including net losses of $9.6 million during the first nine months of fiscal year
2021 and $10.4 million in fiscal year 2020. As of January 31, 2021, we had an accumulated deficit of $229.7 million. To date,
our activities have consisted primarily of activities related to the development and testing of our technologies and our PowerBuoy&reg;.
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.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="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.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt"><B><I>We must
continually improve existing products, design and sell new products and invest in research and development in order to compete
effectively.</I></B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">The markets
for our products are characterized by rapid technological change, evolving industry standards and continuous improvements in products.
Due to constant changes in our markets, future success depends on our ability to develop new technologies, products, processes
and product applications. New product development and commercialization efforts, including efforts to enter markets or product
categories in which we have limited or no prior experience, have inherent risks. These risks include the costs involved, such
as development and commercialization, product development or launch delays, and the failure of new products and line extensions
to achieve anticipated levels of market acceptance or growth in sales or operating income. We also face the risk that our competitors
will introduce innovative new products that compete with our products. If new product development and commercialization efforts
are not successful, our financial results could be adversely affected.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">Product and
technological developments are accomplished primarily through internally-funded R&amp;D projects. Because it is not generally
possible to predict the amount of time required and costs involved in achieving certain R&amp;D objectives, actual development
costs may exceed budgeted amounts and estimated product development schedules may be extended. Our financial condition and results
of operations may be materially and adversely affected if:</FONT></P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.5in"><FONT STYLE="font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">Product improvements
    are not completed on a timely basis;</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-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">New products are not
    introduced on a timely basis or do not achieve sufficient market penetration;</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-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">There are budget overruns
    or delays in R&amp;D efforts; or</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-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">New products experience
    reliability or quality problems, or otherwise do not meet customer preferences or requirements.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt"><B><I>The scale
and scope of the recent COVID-19 outbreak, the resulting pandemic, and the impact on the financial markets is unknown and could
adversely affect the Company&rsquo;s business, financial condition and results of operation at least for the near term.</I></B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">Since the beginning
of January 2020, the COVID-19 outbreak has caused significant disruption in the financial markets both globally and in the U.S.
As the U.S. faces the COVID-19 pandemic, we are following the recommendations of government and health authorities to minimize
exposure risk for our employees. The rapid spread of COVID-19 globally also has resulted in increased travel restrictions and
disruption and shutdown of certain businesses in the U.S. and abroad, including disruptions to our own business. We are closely
monitoring this global health crisis and will reassess its strategy and operational activities on a regular, ongoing basis as
the situation evolves.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">As a result
of the changes in work protocols, as well as related pandemic fears, quarantines and market downturns, we may experience impacts
from changes in customer behavior. Our business is dependent upon the willingness and ability of our customers to conduct transactions,
as well as the ability of customers to meet existing payment or other obligations. The spread of COVID-19 has caused severe disruptions
in the worldwide economy, which has in turn disrupted the business, activities, and operations of our business and operations,
as well as that of our customers. For example, our employees have been unable to travel to Chile to perform final testing and
assembly of our PB3 PowerBuoy&reg; for EGP. Due to the COVID-19 pandemic, the Company declared force majeure in April 2020. Due
to travel restrictions imposed by the U.S. and Chile the Company delayed the deployment of its PB3 PowerBouy&reg; in Chile which
was originally scheduled for April 2020.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">If COVID-19
were to continue to affect a significant amount of our workforce, we may experience delays or the inability to produce and deliver
solutions to our customers on a timely basis. In addition, one or more of our customers, service providers or suppliers may experience
financial distress, file for bankruptcy protection, go out of business, or suffer disruptions in their business due to the COVID-19
outbreak. As with EGP, travel restrictions due to COVID-19 may also prevent our employees from completing customer work. The global
scale and scope of COVID-19 is unknown and the duration of the business disruption and related financial impact cannot be reasonably
estimated at this time.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">The extent to
which the coronavirus impacts our results will ultimately depend on future developments, which are highly uncertain, and will
include emerging information concerning the severity of COVID-19 and the actions taken by governments and private businesses to
attempt to contain COVID-19. However, we believe the coronavirus has and will continue to adversely affect our business, financial
condition and results of operations at least for the near term.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="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: 0.6in"><FONT STYLE="font-size: 10pt"><B>Item 2.</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><B><I><A NAME="pri_007"></A>UNREGISTERED
    SALES OF EQUITY SECURITIES AND USE OF PROCEEDS</I></B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">On October 24,
2019, we issued to Aspire Capital 194,805 shares of common stock as a commitment fee pursuant to the terms of a common stock purchase
agreement dated October 24, 2019. As of September 18, 2020, we have sold 6,424,205 shares of common stock with an aggregate market
value of $4.0 million at an average price of $0.63 per share pursuant to this agreement with Aspire Capital. This agreement was
fully utilized and terminated on September 18, 2020.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">The following
table details the Company&rsquo;s share repurchases during the quarter:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 29.7pt; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 95%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center; border-bottom: Black 1.5pt solid"><FONT STYLE="font-size: 10pt">Period</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><FONT STYLE="font-size: 10pt">Total Number of
    Shares Purchased</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><FONT STYLE="font-size: 10pt">Average Price Paid
    per Share</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><FONT STYLE="font-size: 10pt">Total Number of
    Shares Purchased as Part of Publicly Announced Plans</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><FONT STYLE="font-size: 10pt">Approximate Dollar
    <BR> Value of Shares that May Yet Be Purchased Under the Plan</FONT></TD><TD STYLE="padding-bottom: 1.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 40%"><FONT STYLE="font-size: 10pt">November 1 - November 30</FONT></TD><TD STYLE="width: 2%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="width: 11%; text-align: right"><FONT STYLE="font-size: 10pt">4,237</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="width: 2%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="width: 11%; text-align: right"><FONT STYLE="font-size: 10pt">1.68</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="width: 2%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="width: 11%; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="width: 2%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="width: 11%; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD><FONT STYLE="font-size: 10pt">December 1 - December 31</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">12,552</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">2.35</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><FONT STYLE="font-size: 10pt">January 1 - January 31</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="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: 0.6in"><FONT STYLE="font-size: 10pt"><B>Item 3.</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><B><I><A NAME="pri_008"></A>DEFAULTS UPON
    SENIOR SECURITIES</I></B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">None.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="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: 0.6in"><FONT STYLE="font-size: 10pt"><B>Item 4.</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><B><I><A NAME="pri_009"></A>MINE SAFETY
    DISCLOSURES</I></B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">Not applicable.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="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: 0.6in"><FONT STYLE="font-size: 10pt"><B>Item 5.</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><B><I><A NAME="pri_010"></A>OTHER INFORMATION</I></B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">None.</FONT></P>

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


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="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: 0.6in"><FONT STYLE="font-size: 10pt"><B>Item 6.</B></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><B><I><A NAME="pri_011"></A>EXHIBIT INDEX</I></B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"><FONT STYLE="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: 0.5in"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">10.1</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.15in"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt"><A HREF="https://www.sec.gov/Archives/edgar/data/1378140/000149315220022111/ex10-1.htm" STYLE="-sec-extract: exhibit">Sales
    Agreement, dated November 20, 2020, by and between Ocean Power Technologies, Inc. and A.G.P./Alliance Global Partners (incorporated
    by reference to Exhibit 10.1 to the Company&rsquo;s Current Report on Form 8-K filed on November 20, 2020.</A></FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">31.1</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="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></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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="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-size: 10pt">31.2</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="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></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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="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-size: 10pt">32.1</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">*</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt"><A HREF="ex32-1.htm">Certification
    of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002</A></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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="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-size: 10pt">32.2</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">*</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt"><A HREF="ex32-2.htm">Certification
    of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002</A></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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="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-size: 10pt">101</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">The following financial
    information from Ocean Power Technologies, Inc.&rsquo;s Quarterly Report on Form 10-Q for the quarter ended January 31, 2021,
    formatted in eXtensible Business Reporting Language (XBRL): (i) Consolidated Balance Sheets &ndash; January 31, 2021 (unaudited)
    and April 30, 2019, (ii) Consolidated Statements of Operations (unaudited) &ndash; three and nine months ended January 31,
    2021 and 2020, (iii) Consolidated Statements of Comprehensive Loss (unaudited) &ndash; three and nine months ended January
    31, 2021 and 2020, (iv) Consolidated Statement of Stockholders&rsquo; Equity (unaudited) &ndash; three and nine months ended
    January 31, 2021 and 2020 (v) Consolidated Statements of Cash Flows (unaudited) &ndash;nine months ended January 31, 2021
    and 2020, (vi) Notes to Consolidated Financial Statements.**</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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">* As provided in Item
    601(b)(32)(ii) of Regulation S-K, this exhibit shall not be deemed to be &ldquo;filed&rdquo; 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 &ldquo;filed&rdquo;
    for purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liability under those sections.</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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">** As provided in
    Rule 406T of Regulation S-T, this exhibit shall not be deemed &ldquo;filed&rdquo; 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 &ldquo;filed&rdquo;
    for purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liability under those sections.</FONT></TD></TR>
</TABLE>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 10pt"><B><A NAME="pri_012"></A>SIGNATURES</B></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="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.</FONT></P>

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    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt"><B><U>Ocean
    Power Technologies, Inc.</U></B></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-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt"><I>(Registrant)</I></FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 50%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top; width: 3%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: bottom; width: 47%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="padding-bottom: 1.5pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Date: March 5,
    2021</FONT></TD>
    <TD STYLE="padding-bottom: 1.5pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><I>&nbsp;</I></FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><I>/s/
    George H. Kirby III</I></FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">George H. Kirby III</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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><I>President and Chief Executive Officer</I></FONT></TD></TR>

<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="padding-bottom: 1.5pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Date: March 5,
    2021</FONT></TD>
    <TD STYLE="padding-bottom: 1.5pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><I>&nbsp;</I></FONT></TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><I>/s/
    Matthew T. Shafer</I></FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Matthew T. Shafer</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-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><I>Chief Financial Officer</I></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>


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<TYPE>EX-31.1
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<P STYLE="text-align: center; margin-top: 0; margin-bottom: 0">&nbsp;</P>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: right"><B>Exhibit 31.1</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>CERTIFICATION PURSUANT TO SECTION 302 OF
SARBANES-OXLEY ACT</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">I, George H. Kirby III, certify that:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify">1.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.1in; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">I have reviewed this Quarterly Report
    on Form 10-Q of Ocean Power Technologies, Inc.;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">2.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">3.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">4.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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:</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">(a)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">(b)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">(c)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">(d)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</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">5.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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):</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">(a)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">(b)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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.</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

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<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%">Date: March 5, 2021</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;&nbsp;&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="padding-bottom: 1.5pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><I>/s/ George H. Kirby III</I></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">George H. Kirby III</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><I>President and Chief Executive Officer</I></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: right"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: right">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: right"></P>

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<TYPE>EX-31.2
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<P STYLE="text-align: center; margin-top: 0; margin-bottom: 0">&nbsp;</P>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: right"><B>Exhibit 31.2</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>CERTIFICATION PURSUANT TO SECTION 302 OF
SARBANES-OXLEY ACT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">I, Matthew T. Shafer, certify that:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify">1.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.1in; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">I have reviewed this Quarterly Report
    on Form 10-Q of Ocean Power Technologies, Inc.;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">2.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">3.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">4.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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:</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">(a)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</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">(b)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">(c)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">(d)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</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">5.</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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):</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">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</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">(a)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">(b)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">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.</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%">Date: March 5, 2021</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;&nbsp;&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="padding-bottom: 1.5pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><I>/s/ Matthew T. Shafer</I></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">Matthew T. Shafer</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><I>Chief Financial Officer</I></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: right">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: right"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: right">&nbsp;</P>

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<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="text-align: center; margin-top: 0; margin-bottom: 0">&nbsp;</P>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: right"><B>Exhibit 32.1</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>CERTIFICATION PURSUANT TO 18 U.S.C. SECTION
1350,</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>AS ADOPTED PURSUANT TO</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>SECTION 906 OF THE SARBANES-OXLEY ACT OF
2002</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center">&nbsp;</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 January 31, 2021, as filed with the
Securities and Exchange Commission on the date hereof (the &ldquo;Report&rdquo;), the undersigned, George H. Kirby III, 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: 0; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify">(1)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.1in; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">The Report fully complies with the requirements
    of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">(2)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">The information contained in the Report fairly presents,
    in all material respects, the financial condition and results of operations of the Company.</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%">Date: March 5, 2021</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;&nbsp;&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="padding-bottom: 1.5pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><I>/s/ George H. Kirby III</I></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">George H. Kirby III</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><I>President and Chief Executive Officer</I></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"></P>

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<DOCUMENT>
<TYPE>EX-32.2
<SEQUENCE>5
<FILENAME>ex32-2.htm
<TEXT>
<HTML>
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<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="text-align: center; margin-top: 0; margin-bottom: 0">&nbsp;</P>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><B>Exhibit 32.2</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>CERTIFICATION PURSUANT TO 18 U.S.C. SECTION
1350,</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>AS ADOPTED PURSUANT TO</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>SECTION 906 OF THE SARBANES-OXLEY ACT OF
2002</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center">&nbsp;</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 January 31, 2021, as filed with the
Securities and Exchange Commission on the date hereof (the &ldquo;Report&rdquo;), the undersigned, Matthew T. Shafer, 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: 0; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify">(1)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 0.1in; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">The Report fully complies with the requirements
    of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">&nbsp;</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">(2)</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify">The information contained in the Report fairly presents,
    in all material respects, the financial condition and results of operations of the Company.</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%">Date: March 5, 2021</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 50%">&nbsp;&nbsp;&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="padding-bottom: 1.5pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif"><I>/s/ Matthew T. Shafer </I>&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">Matthew T. Shafer &nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; vertical-align: top">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><I>Chief Financial Officer </I>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<DOCUMENT>
<TYPE>EX-101.INS
<SEQUENCE>6
<FILENAME>optt-20210131.xml
<DESCRIPTION>XBRL INSTANCE FILE
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    <us-gaap:PrepaidInsurance contextRef="AsOf2021-01-31" unitRef="USD" decimals="-3">411000</us-gaap:PrepaidInsurance>
    <us-gaap:PrepaidInsurance contextRef="AsOf2020-04-30" unitRef="USD" decimals="-3">124000</us-gaap:PrepaidInsurance>
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    <OPTT:PrepaidOfferingCosts contextRef="AsOf2020-04-30" unitRef="USD" decimals="-3">275000</OPTT:PrepaidOfferingCosts>
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    <us-gaap:OtherPrepaidExpenseCurrent contextRef="AsOf2020-04-30" unitRef="USD" decimals="-3">127000</us-gaap:OtherPrepaidExpenseCurrent>
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    <us-gaap:Depreciation contextRef="From2020-11-01to2021-01-31" unitRef="USD" decimals="-3">33000</us-gaap:Depreciation>
    <us-gaap:Depreciation contextRef="From2019-11-01to2020-01-31" unitRef="USD" decimals="-3">40000</us-gaap:Depreciation>
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    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2020-04-30" unitRef="USD" decimals="-3">1656000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2020-04-30_us-gaap_EquipmentMember" unitRef="USD" decimals="-3">342000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2020-04-30_custom_ComputerEquipmentAndSoftwareMember" unitRef="USD" decimals="-3">486000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2020-04-30_custom_OfficeFurnitureAndEquipmentMember" unitRef="USD" decimals="-3">339000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2020-04-30_us-gaap_LeaseholdImprovementsMember" unitRef="USD" decimals="-3">474000</us-gaap:PropertyPlantAndEquipmentGross>
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    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2021-01-31_custom_ComputerEquipmentAndSoftwareMember" unitRef="USD" decimals="-3">502000</us-gaap:PropertyPlantAndEquipmentGross>
    <us-gaap:PropertyPlantAndEquipmentGross contextRef="AsOf2021-01-31_custom_OfficeFurnitureAndEquipmentMember" unitRef="USD" decimals="-3">339000</us-gaap:PropertyPlantAndEquipmentGross>
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    <OPTT:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights contextRef="AsOf2019-04-08_custom_PreFundedWarrantsMember" unitRef="Shares" decimals="INF">3385680</OPTT:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights>
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    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember" unitRef="USDPShares" decimals="INF">187.20</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 contextRef="AsOf2019-04-08_custom_SecuritiesPurchaseAgreementMember" unitRef="USDPShares" decimals="INF">3.85</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 contextRef="AsOf2019-04-08_custom_PreFundedWarrantsMember" unitRef="USDPShares" decimals="INF">0.01</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 contextRef="AsOf2016-06-02_custom_SecondAmendedPurchaseAgreementMember" unitRef="USDPShares" decimals="INF">121.60</us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1>
    <us-gaap:WarrantsAndRightsOutstandingTerm contextRef="AsOf2016-07-22_custom_SecondAmendedPurchaseAgreementMember">P5Y</us-gaap:WarrantsAndRightsOutstandingTerm>
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    <OPTT:NumberOfExercisedWarrants contextRef="AsOf2021-01-31_custom_SecondAmendedPurchaseAgreementMember" unitRef="Shares" xsi:nil="true" />
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background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Other receivables&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;244&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Prepaid insurance&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13; 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text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 36%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Risk-free interest rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.6&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 14%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.6&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 13%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected dividend yield&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected life (in years)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.5 - 5.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.5 - 5.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.5 - 5.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.5 - 5.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected volatility&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;136.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;127.6% - 128.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;136.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;127.6% - 128.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;/p&gt;</us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock>
    <us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock contextRef="From2020-05-01to2021-01-31_custom_PerformanceStockOptionsMember">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company determined these awards contain&#13;a market- based condition and estimated the fair value using the Monte Carlo simulation model with the following assumptions:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Risk-free interest rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.3&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.3&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected dividend yield&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected life (in years)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected volatility&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;76.0%- 136.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;115.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;76.0%- 136.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;115.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;/p&gt;</us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock>
    <us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of stock options under our stock&#13;incentive plans is detailed in the following table.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Remaining&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Shares&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Underlying&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Term&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(In Years)&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 55%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Outstanding as of April 30, 2020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;474,128&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;3.56&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.4&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Granted&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;248,876&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.93&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Exercised&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(175,500&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.05&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Cancelled/forfeited&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(28,719&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;6.29&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Outstanding as of January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;518,785&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;3.96&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Exercisable as of January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;249,577&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.21&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;8.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;/p&gt;</us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock>
    <us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock contextRef="From2020-05-01to2021-01-31_custom_PerformanceStockOptionsMember">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of performance stock options under&#13;our stock incentive plans is detailed in the following table.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Remaining&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Shares&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Underlying&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Term&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(In Years)&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 55%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Outstanding as of April 30, 2020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;81,347&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.05&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Granted&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;344,723&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.93&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Exercised&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Cancelled/forfeited&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Outstanding as of January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;426,070&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.57&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.8&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Exercisable as of January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;40,681&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.05&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;/p&gt;</us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock>
    <us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(1) Background, Basis of Presentation and&#13;Liquidity&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;b&gt;&lt;i&gt;a) Background&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Ocean Power Technologies, Inc. (the &amp;#8220;Company&amp;#8221;,&#13;&amp;#8220;we&amp;#8221;, &amp;#8220;us&amp;#8221;, &amp;#8220;our&amp;#8221;) was founded in 1984 in New Jersey, commenced business operations in 1994&#13;and re-incorporated in Delaware in 2007. We are a marine power solutions provider. We control the design, manufacture, sales, installation,&#13;operations and maintenance of our products and solutions while working closely with partners that provide payloads, integration&#13;services, and marine installation capabilities. We believe our solutions provide persistent and reliable distributed offshore power&#13;along with communications for remote surface and subsea applications. Our mission and purpose are to utilize our proprietary, state-of-the-art&#13;technologies to enhance the environment by reducing the global carbon footprint through clean and renewable solutions for reliable&#13;electrical power and, in so doing, drive demand for our products and services. Before 2015, government agencies had accounted for&#13;a significant portion of the Company&amp;#8217;s revenues. These revenues were largely for the support of product development efforts&#13;relating to our technology. Today our goal is to generate the majority of our revenue from the commercialization of products and&#13;solutions, and sales of services to support our business operations. As we continue to develop and commercialize our products and&#13;services, we expect to use our cash on hand and cash from operating activities to support our business until we can achieve positive&#13;cash flow from the commercialization of solutions, products and services.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;b)&lt;/i&gt;&lt;/b&gt;&amp;#160;&lt;b&gt;&lt;i&gt;Basis of Presentation&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The accompanying unaudited consolidated financial&#13;statements have been prepared in accordance with accounting principles generally accepted in the United States of America (&amp;#8220;GAAP&amp;#8221;)&#13;and for interim financial information in accordance with the Securities and Exchange Commission (&amp;#8220;SEC&amp;#8221;), instructions&#13;to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP&#13;for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered&#13;necessary for a fair presentation have been included. The interim operating results are not necessarily indicative of the results&#13;for a full year or for any other interim period. Further information on potential factors that could affect the Company&amp;#8217;s&#13;financial results can be found in the Company&amp;#8217;s Annual Report on Form 10-K for the year ended April 30, 2020 filed with the&#13;SEC and elsewhere in this Form 10-Q.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;c)&lt;/i&gt;&lt;/b&gt;&amp;#160;&lt;b&gt;&lt;i&gt;Liquidity/Going&#13;Concern&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Our consolidated financial statements have&#13;been prepared assuming the Company will continue as a going concern. The Company has experienced recurring losses from operations,&amp;#160;and&#13;has used net cash in operating activities of approximately $8.5 million through the nine months ended January 31, 2021 and approximately&#13;$10.5 million for the fiscal year ending April 30, 2020 all of&amp;#160;which have contributed to an accumulated deficit of $229.7&#13;million as of January 31, 2021. These factors raise substantial doubt about the Company&amp;#8217;s ability to continue as a going&#13;concern. As of January 31, 2021, based in large part on the equity raises discussed below, the Company had approximately $79.8&#13;million in&amp;#160;unrestricted&amp;#160;cash and cash equivalents on hand. Based on the Company&amp;#8217;s current&amp;#160;unrestricted&amp;#160;cash&#13;and cash equivalents balances, and its ability to raise additional equity under facilities currently in place, the Company believes&#13;that it will be able to finance its capital requirements and&amp;#160;operations&amp;#160;for at least the next 12 months&amp;#160;from the&#13;date of this Report.&amp;#160;The Company expects to continue to fund our business with sales of our securities and through generating&#13;revenue with customers. The Company cannot provide assurances that it will be able to secure additional funding when needed or&#13;at all, or, if secured, that such funding would be on favorable terms. The Company also cannot provide assurances that it will&#13;generate sufficient revenue from customers to fund our business.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The consolidated financial statements have&#13;been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the normal&#13;course of business. The consolidated financial statements do not include any adjustments relating to the recoverability and classification&#13;of recorded assets amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Management continues to evaluate different&#13;strategies to obtain the required additional funding for future operations. These strategies may include, but are not limited to,&#13;continued pursuit of business opportunities, additional funding from current and /or new investors, officers and directors; borrowings&#13;of debt; or a public offering of the Company&amp;#8217;s equity or debt securities, or the acquisition of third-party entities that&#13;have similar business focuses. There can be no assurance that any of these future-funding efforts will be successful. The Company&#13;currently has committed sources of equity financing through&amp;#160;it&amp;#8217;s&amp;#160;At the Market Offering Agreement with A.G.P/Alliance&#13;Global Partners (&amp;#8220;AGP&amp;#8221;) and its equity line with Aspire Capital (discussed further below), but the Company cannot be&#13;sure that additional equity and/or debt financing will be available to the Company as needed on acceptable terms, or at all. Historically,&#13;the Company has raised capital through securities sales in the public capital markets. The sale of additional equity or convertible&#13;securities could result in dilution to stockholders. If additional funds are raised through the issuance of debt securities, these&#13;securities could have rights senior to those associated with the Company&amp;#8217;s common stock and could contain covenants that&#13;would restrict its operations. Financing may not be available in amounts or on terms acceptable to the Company, or at all. If the&#13;Company is unable to obtain required financing, the Company may be required to curtail or limit operations, product development&#13;costs, and/or selling, general and administrative activities in order to reduce its cash expenditures, including its planned product&#13;development and marketing efforts, which could materially and adversely harm its financial condition and operating results. If&#13;the Company is unable to secure additional financing, it may be unable to execute its business plan, take advantage of future opportunities&#13;or be forced to cease operations.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In fiscal year 2020 and during the first nine&#13;months of fiscal year 2021 ended January 31, 2021, the Company has continued to make investments in ongoing product development&#13;efforts in anticipation of future growth. The Company&amp;#8217;s future results of operations involve significant risks and uncertainties.&#13;Factors that could affect the Company&amp;#8217;s future operating results and cause actual results to vary materially from expectations&#13;include, but are not limited to, risks from lack of available financing and insufficient capital, performance of products, its&#13;inability to market and commercialize its products and new products that it may develop, technology development, scalability of&#13;technology and production, dependence on skills of key personnel, concentration of customers and suppliers, deployment risks and&#13;laws, regulations and permitting.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;At the Market Offering Agreements&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On January 7, 2019, the Company entered into&#13;an At the Market Offering Agreement (&amp;#8220;2019 ATM Facility&amp;#8221;) with AGP, under which the Company may issue and sell to or&#13;through AGP, acting as agent and/or principal, shares of the Company&amp;#8217;s common stock having an aggregate offering price of&#13;up to&amp;#160;$25.0&amp;#160;million. From inception of the program through its termination on December 8, 2020, under the 2019 ATM Facility,&#13;the Company sold and issued an aggregate of 17,595,472 shares of its common stock with an aggregate market value of $23.4 million&#13;at an average price of $1.33 per share and paid AGP a sales commission of approximately $0.8 million related to those shares. The&#13;agreement was fully utilized and terminated on December 8, 2020.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On November 20, 2020, the Company entered into&#13;a new At the Market Offering Agreement with AGP (the &amp;#8220;2020 ATM Facility&amp;#8221;).&amp;#160;The Company on December 4, 2020 filed&#13;a prospectus with Securities and Exchange Commission whereby,&amp;#160;the Company may issue and sell to or through AGP, acting as&#13;agent and/or principal, shares of the Company&amp;#8217;s common stock having an aggregate offering price of up to $50.0 million. From&#13;inception of the 2020 ATM Facility through January 31, 2021, the Company sold and issued an aggregate of 17,179,883 shares of its&#13;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&#13;of approximately $1.6 million related to those shares. The dollar amount&amp;#160;reported&amp;#160;in the&amp;#160;prospectus filing&amp;#160;is&#13;fully utilized.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Equity Line Common Stock Purchase Agreements&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On October 24, 2019, the Company entered into&#13;a common stock purchase agreement with Aspire Capital which provided that, subject to certain terms, conditions and limitations,&#13;Aspire Capital is committed to purchase up to an aggregate of $10.0 million of shares of the Company&amp;#8217;s common stock over&#13;a 30-month period. Through September 18, 2020, the Company has sold an aggregate of 6,424,205 shares of common stock with an aggregate&#13;market value of $4.0 million at an average price of $0.63 per share pursuant to this common stock purchase agreement. The agreement&#13;was fully utilized and terminated on September 18, 2020.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On September 18, 2020, the Company entered&#13;into a new common stock purchase agreement with Aspire Capital which provided that, subject to certain terms, conditions and limitations,&#13;Aspire Capital is committed to purchase up to an aggregate of $12.5 million of shares of the Company&amp;#8217;s common stock over&#13;a 30-month period that does not exceed 19.99% of the outstanding common stock on the date of the agreement. The number of shares&#13;the Company could issue within the 19.99% limit is 3,722,251 shares&amp;#160;without shareholder approval.&amp;#160;Shareholder approval&#13;was received at the Company&amp;#8217;s annual meeting of stockholders on December 23, 2020 for the sale of 9,864,706 additional shares&#13;of common stock which is over the 19.99% limit of outstanding common stock on the date of the agreement. Through January 31, 2021,&#13;the Company has sold an aggregate of 2,250,000 shares of common stock with an aggregate market value of $7.4 million at an average&#13;price of $3.28 per share pursuant to this common stock purchase agreement.&lt;/p&gt;</us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock>
    <us-gaap:SignificantAccountingPoliciesTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(2) Summary of Significant Accounting Policies&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(a) Consolidation&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The accompanying consolidated financial statements&#13;include the accounts of the Company and its majority-owned subsidiaries. All significant intercompany balances and transactions&#13;have been eliminated in consolidation.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(b) Use of Estimates&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;The preparation of&#13;the consolidated financial statements requires management of the Company to make a number of estimates and assumptions relating&#13;to the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated&#13;financial statements and the reported amounts of revenues and expenses during the period. Significant items subject to such estimates&#13;and assumptions include estimated costs to complete projects; and the input method used to measure completion over time of customer&#13;contracts for purposes of revenue recognition. Actual results could differ from those estimates.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(c) Cash, Cash Equivalents, Restricted&#13;Cash and Security Agreements&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Cash and Cash Equivalents&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company considers all highly liquid investments&#13;with a maturity of three months or less when purchased to be cash equivalents. The Company invests excess cash in a money market&#13;account.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 63%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Checking and savings accounts&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2,597&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,551&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Money market account&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;77,204&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;8,451&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79,801&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,002&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Restricted Cash and Security Agreements&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company has two agreements with Santander&amp;#160;Bank,&#13;N.A. (&amp;#8220;Santander&amp;#8221;).&amp;#160;Cash is on deposit at Santander and serves as security for a letter of credit issued by Santander&#13;for the lease of warehouse/office space in Monroe Township, New Jersey. This agreement cannot be extended beyond July 31, 2025&#13;and is&amp;#160;cancellable&amp;#160;at the discretion of the bank. Santander also issued two letters of credit to subsidiaries of Enel&#13;Green Power (&amp;#8220;EGP&amp;#8221;) pursuant to the Company&amp;#8217;s contracts with EGP. The first letter of credit was issued in the&#13;amount of $125,690 that expires in May 2021. The second letter of credit was issued in the amount of $645,467 and reduced to $322,734&#13;in August 2020.&amp;#160;The&amp;#160;second letter of credit&amp;#160;will be&amp;#160;reduced to $64,547&amp;#160;once the PB3 PowerBuoy&lt;sup&gt;&amp;#174;&lt;/sup&gt;&amp;#160;is&#13;fully deployed and passes final acceptance testing .&amp;#160;The remaining amount expires in December 2021.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Restricted cash includes the following:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="width: 63%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Santander Bank&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;606&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;928&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;606&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;928&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following table provides a reconciliation&#13;of cash, cash equivalents and restricted cash reported within the Statement of Financial Position that sum to the total of the&#13;same such amounts shown in the Statement of Cash Flows.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 63%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Cash and cash equivalents&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79,801&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,002&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Restricted cash- short term&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;384&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;707&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Restricted cash- long term&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;222&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;221&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;80,407&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,930&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(d) Concentration of Credit Risk&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Financial instruments that potentially subject&#13;the Company to credit risk consist principally of accounts receivable and cash and cash equivalents. The Company believes that&#13;its credit risk is limited because the Company&amp;#8217;s current contracts are with companies with strong financial strength. The&#13;Company invests its excess cash in a money market account and does not believe that it is exposed to any significant risks related&#13;to its cash and money market accounts. Cash and cash equivalents are also maintained at foreign financial institutions. Cash and&#13;cash equivalents in foreign financial institutions as of January 31, 2021 was $0.3 million.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The table below shows the percentage of the&#13;Company&amp;#8217;s revenues derived from customers whose revenues accounted for at least 10% of the Company&amp;#8217;s consolidated revenues&#13;for at least one of the periods indicated:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="14" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Eni S.p.A.&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;34&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;42&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;135&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;118&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Premier Oil UK Limited&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;27&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;126&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;EGP&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;223&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;678&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;379&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;774&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;ACET&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;33&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;37&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Other&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;27&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;26&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;113&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;317&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;725&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;604&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,131&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;b&gt;&lt;i&gt;(e) Share-Based Compensation&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;Costs resulting from&#13;all share-based payment transactions are recognized in the consolidated financial statements at their fair values. The following&#13;table summarizes share-based compensation related to the Company&amp;#8217;s share-based plans by expense category for the three and&#13;nine months ended January 31, 2021 and 2020:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="14" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Engineering and product development&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;32&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;12&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;91&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;52&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Selling, general and administrative&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;83&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;44&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;247&lt;/font&gt;&lt;/td&gt;&#13; 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   &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(f)&amp;#160;&lt;i&gt;Revenue Recognition&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A performance obligation is the unit of account&#13;for revenue recognition. The Company assesses the goods or services promised in a contract with a customer and identifies as a&#13;performance obligation either: a) a good or service (or a bundle of goods or services) that is distinct; or b) a series of distinct&#13;goods or services that are substantially the same and that have the same pattern of transfer to the customer. A contract may contain&#13;a single or multiple performance obligations. For contracts with multiple performance obligations, the Company allocates the contracted&#13;transaction price to each performance obligation based upon the relative standalone selling price, which represents the price the&#13;Company would sell a promised good or service separately to a customer. The Company determines the standalone selling price based&#13;upon the facts and circumstances of each obligated good or service. The majority of the Company&amp;#8217;s contracts have no observable&#13;standalone selling price since the associated products and services are customized to customer specifications. As such, the standalone&#13;selling price generally reflects the Company&amp;#8217;s forecast of the total cost to satisfy the performance obligation plus an appropriate&#13;profit margin.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&amp;#160;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The nature of the Company&amp;#8217;s contracts&#13;may give rise to several types of variable consideration, including unpriced change orders and liquidated damages and penalties.&#13;Variable consideration can also arise from modifications to the scope of services. Variable consideration is included in the transaction&#13;price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur once the uncertainty&#13;associated with the variable consideration is resolved. Our estimates of variable consideration and determination of whether to&#13;include such amounts in the transaction price are based largely on our assessment of legal enforceability, performance and any&#13;other information (historical, current, and forecasted) that is reasonably available to us. Accounting Standards Update (&amp;#8220;ASU&amp;#8221;)&#13;2016-10 provides a practical expedient that permits presentation of shipping and handling costs, that occur after control of the&#13;promised goods or services transfer to the customer, as fulfillment costs rather than evaluating whether the shipping and handling&#13;activities are promised services to the customer. The Company adopted this practical expedient, but it did not have a material&#13;effect on its Consolidated Financial Statements.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company recognizes revenue when or as it&#13;satisfies a performance obligation by transferring a good or service to a customer, either (1) at a point in time or (2) over time.&#13;A good or service is transferred when or as the customer obtains control of it. The evaluation of whether control of each performance&#13;obligation is transferred at a point in time or over time is made at contract inception. Input measures such as costs incurred&#13;or time elapsed are utilized to assess progress against specific contractual performance obligations for the Company&amp;#8217;s services.&#13;The selection of the method to measure progress towards completion requires judgment and is based on the nature of the services&#13;to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of progress&#13;against the performance obligations incorporated within the contractual agreements. When the Company&amp;#8217;s estimate of total&#13;costs to be incurred to satisfy the performance obligations exceed revenue, the Company recognizes the loss immediately.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company&amp;#8217;s contracts are either cost&#13;plus or fixed price contracts. Under cost plus contracts, customers are billed for actual expenses incurred plus an agreed-upon&#13;fee. Under cost plus contracts, a profit or loss on a project is recognized depending on whether actual costs are more or less&#13;than the agreed upon amount.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company has two types of fixed price contracts,&#13;firm fixed price and cost-sharing. Under firm fixed price contracts, the Company receives an agreed-upon amount for providing products&#13;and services specified in the contract, a profit or loss is recognized depending on whether actual costs are more or less than&#13;the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the customer is only intended to fund a&#13;portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding to the revenue is recorded in&#13;cost of revenues, resulting in gross profit on these contracts of zero. The Company&amp;#8217;s share of the costs is recorded as product&#13;development expense. The Company reports its disaggregation of revenue by contract type since this method best represents the Company&amp;#8217;s&#13;business. For the nine-month periods ended January 31, 2021 and 2020, all of the Company&amp;#8217;s contracts were classified as firm&#13;fixed price.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As of January 31, 2021, the Company&amp;#8217;s&#13;total remaining performance obligations, also referred to as backlog, totaled $0.5 million. The Company expects to recognize approximately&#13;89%, or $0.4 million, of the remaining performance obligations as revenue over the next twelve months.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Products and Solutions Leasing&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company enters into lease arrangements&#13;with certain customers for their products and solutions. As of January 31, 2021, the Company has one lease arrangement with a remaining&#13;operating lease term of less than 10 months. Revenue related to multiple-element arrangements is allocated to lease and non-lease&#13;elements based on their relative standalone selling prices or expected cost plus a margin approach. Lease elements generally include&#13;a PB3 PowerBuoy&lt;sup&gt;&amp;#174;&lt;/sup&gt;&amp;#160;&lt;i&gt;(&amp;#8220;&lt;/i&gt;PB3&amp;#8221;) and components, while non-lease elements generally include engineering,&#13;monitoring and support services. In the lease arrangement, the customer is provided an option to extend the lease term or purchase&#13;the leased PB3 at some point during and/or at the end of the lease term.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company classifies leases as either operating&#13;or financing in accordance with the authoritative accounting guidance contained within ASC Topic 842,&amp;#160;&lt;i&gt;&amp;#8220;Leases&amp;#8221;.&lt;/i&gt;&amp;#160;At&#13;inception of the contract, the Company evaluates the lease against the lease classification criteria within ASC Topic 842. If the&#13;direct financing or sales-type classification criteria are met, then the lease is accounted for as a finance lease. All others&#13;are treated as an operating lease.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;The Company recognizes revenue from&#13;operating lease arrangements generally on a straight-line basis over the lease term and is presented in Revenues in the Consolidated&#13;Statement of Operations. The lease income for the three and nine months ended January 31, 2021 and 2020 was immaterial.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(g) Net Loss per Common Share&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Basic and diluted net loss per share for all&#13;periods presented is computed by dividing net loss by the weighted average number of shares of common stock and common stock equivalents&#13;outstanding during the period. Due to the Company&amp;#8217;s net losses, potentially dilutive securities, consisting of options to&#13;purchase shares of common stock, warrants on common stock and non-vested restricted stock issued to employees and non-employee&#13;directors, were excluded from the diluted loss per share calculation due to their anti-dilutive effect.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In computing diluted net loss per share on&#13;the Consolidated Statement of Operations, warrants on common stock, options to purchase shares of common stock and non-vested restricted&#13;stock issued to employees and non-employee directors, totaling 5,221,258 and 5,565,462 for the three and nine months ended January&#13;31, 2021 and 2020, respectively, were excluded from each of the computations as the effect would be anti-dilutive due to the Company&amp;#8217;s&#13;net losses.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(h) Recently Issued Accounting Standards&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In June 2016, the Financial Accounting Standards&#13;Board (&amp;#8220;FASB&amp;#8221;) issued ASU No. 2016-13, &amp;#8220;&lt;i&gt;Financial Instruments&amp;#160;&lt;/i&gt;-&amp;#160;&lt;i&gt;Credit Losses (Topic 326),&#13;Measurement of Credit Losses on Financial Instruments.&amp;#8221;&amp;#160;&lt;/i&gt;The amendment in this update replaces the incurred loss&#13;impairment methodology in current GAAP with a methodology that reflects expected credit losses on instruments within its scope,&#13;including trade receivables. This update is intended to provide financial statement users with more decision-useful information&#13;about the expected credit losses. In November 2019, the FASB issued No. 2019-10,&amp;#160;&lt;i&gt;Financial Instruments&amp;#8212;Credit Losses&#13;(Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842)&lt;/i&gt;, which deferred the effective date of ASU 2016-13&#13;for Smaller Reporting Companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal&#13;years. The Company is currently evaluating the impact the adoption of ASU 2016-13 will have on its consolidated financial statements.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In August 2018, the FASB issued ASU No. 2018-13,&amp;#160;&lt;i&gt;&amp;#8220;Fair&#13;Value Measurement (Topic 820).&amp;#8221;&amp;#160;&lt;/i&gt;The ASU modifies, removes, and adds several disclosure requirements on fair value&#13;measurements in Topic 820, Fair Value Measurement. The amendments on changes in unrealized gains and losses, the range and weighted&#13;average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement&#13;uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year&#13;of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The Company&#13;adopted this guidance effective May 1, 2020. The adoption of the guidance did not have a material effect on its Consolidated Financial&#13;Statements.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In August 2018, the FASB issued ASU No. 2018-15,&#13;&amp;#8220;&lt;i&gt;Intangibles&amp;#160;&lt;/i&gt;&amp;#8212;&amp;#160;&lt;i&gt;Goodwill and Other&amp;#160;&lt;/i&gt;&amp;#8212;&amp;#160;&lt;i&gt;Internal-Use Software (Subtopic 350-40):&#13;Customer&amp;#8217;s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.&amp;#8221;&lt;/i&gt;&amp;#160;The&#13;ASU requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance&#13;in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. The ASU&#13;permits two methods of adoption: prospectively to all implementation costs incurred after the date of adoption, or retrospectively&#13;to each prior reporting period presented. The Company adopted this guidance on a prospective basis effective May 1, 2020. The&#13;adoption of the guidance did not have a material effect on its Consolidated Financial Statements.&lt;/p&gt;</us-gaap:SignificantAccountingPoliciesTextBlock>
    <OPTT:AccountReceivableContractAssetsAndContractLiabilitiesTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(3) Account Receivable, Contract Assets,&#13;and Contract Liabilities&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following provides further details on the&#13;balance sheet accounts of accounts receivable, contract assets, and contract liabilities from contracts with customers:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 63%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Accounts receivable&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;105&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Contract assets&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;63&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;251&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Contract liabilities&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;75&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;165&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Accounts Receivable&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company grants credit to its customers,&#13;generally without collateral, under normal payment terms (typically 30 to 60 days after invoicing). Generally, invoicing occurs&#13;after the related services are performed or control of good has transferred to the customer. Accounts receivable represents an&#13;unconditional right to consideration arising from the Company&amp;#8217;s performance under contracts with customers. The carrying&#13;value of such receivables represent their estimated realizable value.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Contract Assets&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Significant changes in the contract assets&#13;balances during the period are as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 77%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Transferred to receivables from contract assets recognized at the beginning of the period&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 19%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(251&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Revenue recognized and not billed as of the end of the period&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;63&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Net change in contract assets&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(188&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Contract assets include unbilled amounts typically&#13;resulting from arrangements whereby the right to payment is conditioned on completing additional tasks or services for a performance&#13;obligation. The decrease in contract assets is primarily a result of services performed relating to our project with EGP that was&#13;billed during the nine months ended January 31, 2021.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Contract Liabilities&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Significant changes in the contract liabilities&#13;balances during the period are as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 77%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Revenue recognized that was included in the contract liabilities balance as of the beginning of the period&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 19%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(84&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Transferred to contract assets from contract liabilities recognized at the beginning of the period&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(6&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Net change in contract liabilities&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(90&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Contract liabilities consist of amounts invoiced&#13;to customers in excess of revenue recognized. The decrease in contract liabilities is primarily due to recognition of revenue&#13;relating to our Eni S.p.A. (&amp;#8220;Eni&amp;#8221;) project during the nine months ended January 31, 2021.&lt;/p&gt;</OPTT:AccountReceivableContractAssetsAndContractLiabilitiesTextBlock>
    <us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(5) Property and Equipment, net&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The components of property and equipment, net&#13;as of January 31, 2021 and April 30, 2020 consisted of the following:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 63%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Equipment&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;342&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;342&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Computer equipment &amp;#38; software&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;502&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;486&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Office furniture &amp;#38; equipment&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;339&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;339&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Leasehold improvements&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;474&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;474&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Construction in process&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;15&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;15&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,672&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,656&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Less: accumulated depreciation&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(1,255&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(1,157&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;417&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;499&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Depreciation expense was approximately $33,000&#13;and $40,000 for the three-month periods ended January 31, 2021 and 2020, and approximately $106,000 and $117,000 for the nine-month&#13;periods ended January 31, 2021 and 2020, respectively.&lt;/p&gt;</us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock>
    <us-gaap:LesseeOperatingLeasesTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(6) Leases&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&lt;i&gt;Lessor Information&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;As of January 31, 2021, the Company&#13;has one lease which has been classified as an operating lease per accounting guidance contained within ASC Topic 842,&amp;#8221;&amp;#160;&lt;i&gt;Leases&amp;#8221;&lt;/i&gt;.&#13;The Company&amp;#8217;s remaining term on this operating lease is less than 10 months. The maturity of lease payments remaining on&#13;this lease is immaterial.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&lt;i&gt;Lessee Information&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify"&gt;The Company has a lease for its&#13;facility located in Monroe Township, New Jersey that is used as warehouse/production space and the Company&amp;#8217;s principal offices&#13;and corporate headquarters. The initial lease term is for 7 years with an option to extend the lease for another 5 years. The lease&#13;is classified as an operating lease. The operating lease is included in right-of-use assets, lease liabilities- current and lease&#13;liabilities- long-term on the Company&amp;#8217;s Consolidated Balance Sheets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify"&gt;Right-of-use asset and operating&#13;lease liabilities are recognized based on the present value of future minimum lease payments over the lease term at commencement&#13;date. When the implicit rate of the lease is not provided or cannot be determined, the Company uses the incremental borrowing rate&#13;based on the information available at the effective date to determine the present value of future payments. Lease terms may include&#13;options to extend or terminate the lease when it is reasonably certain that the Company will exercise those options. The renewal&#13;options have not been included in the lease term as they are not reasonably certain of exercise. Lease expense for minimum lease&#13;payments is recognized on a straight- line basis over the lease term and consists of interest on the lease liability and the amortization&#13;of the right of use asset. Variable lease expenses, if any, are recorded as incurred.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On June 10, 2020 the Company signed a 12-month&#13;lease for office space in Houston, Texas. The lease can be extended by the Company by providing the lessor on or before the notice&#13;date of the Company&amp;#8217;s intent to renew or terminate the lease. ASC Topic 842,&amp;#160;&lt;i&gt;&amp;#8220;Leases&amp;#8221;&lt;/i&gt;&amp;#160;allows&#13;a company an accounting policy election to recognize lease payments to the Consolidated Statement of Operations on a straight-line&#13;basis if the lease term is equal to or less 12 months and not recognize a right-of use asset and lease liability. The accounting&#13;policy&amp;#160;election&amp;#160;is made on the commencement date of the lease.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;The operating lease cash flow payments&#13;for the nine months ended January 31, 2021 and 2020 was $259,000 and $240,000, respectively.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&amp;#160;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify"&gt;The components of lease expense&#13;in the Consolidated Statement of Operations for both the three and nine months ended January 31, 2021 and 2020 was as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="14" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Operating lease cost&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;238&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;238&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Short-term lease cost&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;12&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total lease cost&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;86&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;250&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;238&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;Information related to the Company&amp;#8217;s&#13;right-of use assets and lease liabilities as of January 31, 2021 was as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;u&gt;Operating lease:&lt;/u&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="width: 80%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Operating right-of-use asset, net&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,005&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-left: 10pt"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Right-of-use liability- current&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;252&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-left: 10pt"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Right-of-use liability- long term&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;887&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total lease liability&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,139&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Weighted average remaining lease term- operating leases&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;3.72 years&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Weighted average discount rate- operating leases&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;8.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;Total remaining lease payments under&#13;the Company&amp;#8217;s operating leases are as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 75%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Remainder of fiscal year 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 22%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;84&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2022&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;341&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2023&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;352&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2024&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;362&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2025&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total future minimum lease payments&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,323&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Less imputed interest&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,139&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;b&gt;&lt;/b&gt;&lt;/p&gt;</us-gaap:LesseeOperatingLeasesTextBlock>
    <us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(7) Accrued Expenses&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Accrued expenses consist of the following at&#13;January 31, 2021 and April 30, 2020:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 59%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Project costs&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;95&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;48&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Contract loss reserve&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;425&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;216&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Employee incentive payments&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;407&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Accrued salary and benefits&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;831&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;483&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Legal and accounting fees&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;403&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;283&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Accrued taxes payable&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;177&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Other&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;179&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;146&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2,340&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13; 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    <OPTT:WarrantDisclosureTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(8) Warrants&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Liability Classified Warrants&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On June 2, 2016, the Company entered into a&#13;securities purchase agreement, which was amended on June 7, 2016 (as amended, the &amp;#8220;June Purchase Agreement&amp;#8221;) with certain&#13;institutional purchasers (the &amp;#8220;June Purchasers&amp;#8221;). Pursuant to the terms of the June Purchase Agreement, the Company&#13;sold an aggregate of 20,850 shares of Common Stock together with warrants to purchase up to an aggregate of 7,298 shares of Common&#13;Stock. The warrants have an exercise price of $121.60 per share, became exercisable on December 3, 2016 (&amp;#8220;Initial Exercise&#13;Date&amp;#8221;), and will expire five years following the Initial Exercise Date. As of January 31, 2021, none of the warrants&amp;#160;had&amp;#160;been&#13;exercised.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On July 22, 2016, the Company entered into&#13;a Second Amendment to the Purchase Agreement (the &amp;#8220;Second Amended Purchase Agreement&amp;#8221;) with certain institutional purchasers&#13;(the &amp;#8220;July Purchasers&amp;#8221;). Pursuant to the terms of the Second Amended Purchase Agreement, the Company sold an aggregate&#13;of 29,750 shares of Common Stock together with warrants to purchase up to an aggregate of 8,925 shares of Common Stock. The Warrants&#13;were exercisable immediately at an exercise price of $187.20 per share. The Warrants will expire on the fifth (5th) anniversary&#13;of the initial date of issuance. As of January 31, 2021, none of the warrants&amp;#160;had&amp;#160;been exercised.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Equity Classified Warrants&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify"&gt;On April 8, 2019, the Company issued&#13;and sold 1,542,000 shares of common stock and pre-funded warrants to purchase up to 3,385,680 shares of common stock and common&#13;warrants to purchase up to 4,927,680 shares of our common stock in an underwritten public offering. The public offering price for&#13;the pre-funded warrants was equal to the public offering price of the common stock, less the $0.01 per share exercise price of&#13;each warrant. As of January 31, 2021, all of the pre-funded warrants&amp;#160;had&amp;#160;been exercised. The common stock warrants have&#13;an exercise price of $3.85 per share and expire five years from the issuance date. From the issuance to January 31, 2021, warrants&#13;to purchase 677,500 shares of the common stock&amp;#160;had&amp;#160;been exercised.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company accounted for the warrants issued&#13;in connection with its June and July 2016 public offerings in accordance with the guidance in Topic 480 which provides that the&#13;Company classify the warrant instruments as a liability at its fair value. The warrant liabilities are subject to re-measurement&#13;at each balance sheet date using the Black-Scholes option pricing model. The June and July 2016 warrants contain a feature whereby&#13;they could require the transfer of assets and therefore are classified as a liability award in accordance with the guidance in&#13;Topic 480. The warrants have a value close to zero at January 31, 2021 and April 30, 2020 and are reflected within &amp;#8220;Warrant&#13;liabilities&amp;#8221; in the Consolidated Balance Sheets. The pre-funded and common warrants issued in the Company&amp;#8217;s April&#13;8, 2019 public offering did not meet the criteria to be classified as a liability award and therefore were treated as an equity&#13;award and recorded as a component of stockholders&amp;#8217; equity in the Consolidated Balance Sheets.&lt;/p&gt;</OPTT:WarrantDisclosureTextBlock>
    <us-gaap:DebtDisclosureTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(9) Paycheck Protection Program Loan&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As a result of the COVID-19 pandemic, on March&#13;27, 2020, the U.S. Government passed into law the Coronavirus Aid, Relief and Economic Security Act, or the (&amp;#8220;CARES Act&amp;#8221;)&#13;which included the ability to secure loans under the Paycheck Protection Program (&amp;#8220;PPP&amp;#8221;). On May 3, 2020, after its&#13;application was submitted and approved, the Company signed a PPP loan with Santander as the lender for $890,347 pursuant to the&#13;PPP under the CARES Act, as implemented by the U.S. Small Business Association (&amp;#8220;SBA&amp;#8221;). The PPP loan is an unsecured&#13;note with Santander as the lender and governed by a loan agreement with Santander. The interest rate is 1% and the loan is repayable&#13;over two years. The loan contains customary events of defaults relating to, among other things, payment defaults or breaches of&#13;the terms of the loan. Upon the occurrence of an event of default, the lender may require immediate repayment of all outstanding&#13;amounts under the loan. Interest and principal payments are deferred for the first 6 months from the date of the loan. Principal&#13;and interest of approximately $49,000 are payable monthly commencing 6 months after the disbursement date and may be repaid by&#13;the Company at any time prior to maturity with no prepayment penalties. The Company received the proceeds on May 5, 2020.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The SBA allows loan forgiveness for eligible&#13;costs incurred and paid which include (a) payroll costs, (b) interest on any real or personal property mortgage prior to February&#13;15, 2020, (c) rent on any lease in force prior to February 15, 2020, and (d) utility payments for which service began before February&#13;15, 2020. As of January 31, 2021, the Company has utilized all of the loan proceeds. The Company currently believes that the use&#13;of the loan proceeds will meet the conditions for forgiveness of the loan and has submitted a loan forgiveness application to the&#13;SBA asking for 100% forgiveness of the loan. No assurance can be provided that the Company will obtain forgiveness of the loan,&#13;in whole or in part.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On June 5, 2020, the Paycheck Protection Program&#13;Flexibility Act (&amp;#8220;PPPFA&amp;#8221;) was signed into law. Among other changes, the PPPFA (a) reduced the amount of the loan required&#13;to be spent on payroll costs from 75% to 60%, (b) extended the covered period to 24 weeks from 8 weeks, (c) extended the repayment&#13;term of the PPP loan from 2 years to 5 years, and (d) increased the deferred payment date from 6 months to 10 months. For the loans&#13;disbursed before June 5, 2020, the PPPFA provides the option to opt for 24 weeks for spending the loan instead of 8 weeks. The&#13;Company opted for 24 weeks to spend the loan.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company is accruing interest expense until&#13;the loan is forgiven or repaid. If the loan were not forgiven by the SBA and the Company decided to repay the loan over 2 years,&#13;the interest expense for this loan period would be immaterial.&lt;/p&gt;</us-gaap:DebtDisclosureTextBlock>
    <us-gaap:ShortTermDebtTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(10) Loan Payable&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In August 2020 the Company signed a commercial&#13;premium finance agreement in the amount of $466,622 with First Insurance Funding whereas First Insurance Funding prepaid a portion&#13;of the Company insurance premiums including principally the Directors and Officers insurance. The Company will make eight monthly&#13;payments of $58,957, inclusive of interest charges, to repay First Insurance Funding the amount. Interest expense for the loan&#13;period is immaterial.&lt;/p&gt;</us-gaap:ShortTermDebtTextBlock>
    <us-gaap:PreferredStockTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(11) Preferred Stock&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company has authorized 5,000,000 shares&#13;of undesignated preferred stock with a par value of $0.001 per share. As of January 31, 2021, no shares of preferred stock had&#13;been issued.&lt;/p&gt;</us-gaap:PreferredStockTextBlock>
    <us-gaap:StockholdersEquityNoteDisclosureTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(12) Common Stock&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;At the Market Offering Agreements&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On January 7, 2019, the Company entered into&#13;the 2019 ATM Facility with AGP, under which the Company may issue and sell to or through A.G.P./Alliance Global Partners, acting&#13;as agent and/or principal, shares of the Company&amp;#8217;s common stock having an aggregate offering price of up to&amp;#160;$25.0&amp;#160;million.&amp;#160;From&amp;#160;inception&#13;of the program through its termination&amp;#160;on December 8, 2020,&amp;#160;under the 2019 ATM Facility the Company had sold and issued&#13;an aggregate of 17,595,472 shares of its common stock with an aggregate market value of $23.4 million at an average price of $1.33&#13;per share, including 12,342,506 shares in fiscal year 2021 with an aggregate market value of $18.7 million at an average price&#13;of $1.51 per share and paid AGP a sales commission of approximately $0.8 million related to those shares. The agreement was fully&#13;utilized and terminated on December 8, 2020.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On November 20, 2020, the Company entered into&#13;a new At the Market Offering Agreement with AGP (the &amp;#8220;2020 ATM Facility&amp;#8221;).&amp;#160;The Company on December 4, 2020 filed&#13;a prospectus with Securities and Exchange Commission whereby,&amp;#160;the Company may issue and sell to or through AGP, acting as&#13;agent and/or principal, shares of the Company&amp;#8217;s common stock having an aggregate offering price of up to $50.0 million.&amp;#160;From&amp;#160;inception&#13;of the 2020 ATM Facility through January 31, 2021, the Company had sold and issued an aggregate of 17,179,883 shares of its common&#13;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&#13;approximately $1.6 million related to those shares. The dollar amount&amp;#160;reported&amp;#160;in the&amp;#160;prospectus filing&amp;#160;is&#13;fully utilized.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Equity Line Common Stock Purchase Agreements&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On October 24, 2019, the Company entered into&#13;a common stock purchase agreement with Aspire Capital which provided that, subject to certain terms, conditions and limitations,&#13;Aspire Capital is committed to purchase up to an aggregate of $10.0 million of shares of the Company&amp;#8217;s common stock over&#13;a 30-month period. Through September 18, 2020, the Company has sold an aggregate of 6,424,205 shares of common stock with an aggregate&#13;market value of $4.0 million at an average price of $0.63 per share pursuant to this common stock purchase agreement, including&#13;5,025,000 shares in fiscal year 2021 with an aggregate market value of $2.9 million at an average price of $0.57 per share. The&#13;agreement was fully utilized and terminated on September 18, 2020.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On September 18, 2020, the Company entered&#13;into a new common stock purchase agreement with Aspire Capital which provided that, subject to certain terms, conditions and limitations,&#13;Aspire Capital is committed to purchase up to an aggregate of $12.5 million of shares of the Company&amp;#8217;s common stock over&#13;a 30-month period that does not exceed 19.99% of the outstanding common stock on the date of the agreement. The number of shares&#13;the Company could issue within the 19.99% limit is 3,722,251 shares&amp;#160;without shareholder approval.&amp;#160;Shareholder approval&#13;was received at the Company&amp;#8217;s annual meeting of stockholders on December 23, 2020 for the sale of 9,864,706 additional shares&#13;of common stock which is over the 19.99% limit of the outstanding common stock on the date of the agreement. Through January 31,&#13;2021, the Company has sold an aggregate of 2,250,000 shares of common stock with an aggregate market value of $7.4 million at&#13;an average price of $3.28 per share pursuant to this common stock purchase agreement.&lt;/p&gt;</us-gaap:StockholdersEquityNoteDisclosureTextBlock>
    <us-gaap:TreasuryStockTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(13) Treasury Shares&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;During each of the three months ended January&#13;31, 2021 and 2020, 16,789 shares and zero shares of common stock were purchased by the Company from employees to pay taxes related&#13;to the vesting of restricted stock.&amp;#160;During each of the nine months ended January 31, 2021 and 2020, 16,789 shares and 481&#13;shares of common stock were purchased by the Company from employees to pay taxes related to the vesting of restricted stock.&lt;/p&gt;</us-gaap:TreasuryStockTextBlock>
    <us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(14)&amp;#160;Share-Based Compensation&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In 2015, upon approval by the Company&amp;#8217;s&#13;stockholders, the Company&amp;#8217;s 2015 Omnibus Incentive Plan (the &amp;#8220;2015 Plan&amp;#8221;) became effective. A total of 1,332,036&#13;shares are authorized for issuance under the 2015 Omnibus Incentive Plan, including shares available for awards under the 2006&#13;Stock Incentive Plan remaining at the time that plan terminated, or that were subject to awards under the 2006 Stock Incentive&#13;Plan that thereafter terminated by reason of expiration, forfeiture, cancellation or otherwise. If any award under the 2006 Stock&#13;Incentive Plan or 2015 Plan expires, is cancelled, terminates unexercised or is forfeited, those shares become again available&#13;for grant under the 2015 Plan. The 2015 Plan will terminate ten years after its effective date, in October 2025, but is subject&#13;to earlier termination as provided in the 2015 Plan. As of January 31, 2021, the Company has 193,928 shares available for future&#13;issuance under the 2015 Plan.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On January 18, 2018, the Company&amp;#8217;s Board&#13;of Directors adopted the Company&amp;#8217;s Employment Inducement Incentive Award Plan (the &amp;#8220;2018 Inducement Plan&amp;#8221;) pursuant&#13;to which the Company reserved 25,000 shares of common stock for issuance under the Inducement Plan. In accordance with Rule 5635(c)(4)&#13;and Rule 5635(c)(3) of the Nasdaq Listing Rules, awards under the Inducement Plan may only be made to individuals not previously&#13;employees of the Company (or following such individuals&amp;#8217; bona fide period of non-employment with the Company), as an inducement&#13;material to the individuals&amp;#8217; entry into employment with the Company. An award is any right to receive the Company&amp;#8217;s&#13;common stock pursuant to the 2018 Inducement Plan, consisting of a performance share award, restricted stock award, a restricted&#13;stock unit award or a stock payment award. As of January 31, 2021, there were 11,487 shares available for grant under the 2018&#13;Inducement Plan.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Stock Options&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company estimates the fair value of each&#13;stock option award granted with service-based vesting requirements, using the Black-Scholes option pricing model, assuming no dividends,&#13;and using the weighted average valuation assumptions noted in the following table. The risk-free rate is based on the US Treasury&#13;yield curve in effect at the time of grant. The expected life (estimated period of time outstanding) of the stock options granted&#13;is estimated using the &amp;#8220;simplified&amp;#8221; method as permitted by the SEC&amp;#8217;s Staff Accounting Bulletin No. 110,&amp;#160;&lt;i&gt;Share-Based&#13;Payment.&lt;/i&gt;&amp;#160;Expected volatility is based on the Company&amp;#8217;s historical volatility over the expected life of the stock&#13;option granted. The Company granted options to acquire 248,876 and 411,666 shares of common stock during the&amp;#160;three and&amp;#160;nine&#13;months ended January 31, 2021 and 2020. The following assumptions were used to value the awards:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 36%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Risk-free interest rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.6&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 14%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.6&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 13%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected dividend yield&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected life (in years)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.5 - 5.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.5 - 5.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.5 - 5.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.5 - 5.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected volatility&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;136.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;127.6% - 128.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;136.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;127.6% - 128.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of stock options under our stock&#13;incentive plans is detailed in the following table.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Remaining&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Shares&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Underlying&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Term&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(In Years)&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 55%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Outstanding as of April 30, 2020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;474,128&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;3.56&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.4&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Granted&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;248,876&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.93&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Exercised&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(175,500&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.05&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Cancelled/forfeited&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(28,719&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;6.29&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Outstanding as of January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;518,785&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;3.96&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Exercisable as of January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;249,577&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5.21&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;8.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As of January 31, 2021, the total intrinsic&#13;value of outstanding and exercisable options was approximately $0.9 million and $0.6 million, respectively. As of January 31, 2021,&#13;approximately 269,208 additional options were unvested, which had an intrinsic value of $0.3 million and a weighted average remaining&#13;contractual term of 9.9 years.&amp;#160;There was approximately $82,000 and $44,000 of total recognized compensation cost related to&#13;stock options during each of the three months ended January 31, 2021 and 2020, respectively.&amp;#160;There was approximately $0.3&#13;million and $0.2 million of total recognized compensation cost related to stock options during each of the nine months ended January&#13;31, 2021 and 2020, respectively. As of January 31, 2021, there was approximately $0.7 million of total unrecognized compensation&#13;cost related to non-vested stock options granted under the plans. This cost is expected to be recognized over a weighted-average&#13;period of 1.9 years.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Performance Stock Options&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In January of 2020, the Company issued 81,334&#13;performance-based stock options to two of its executives. The awards can vest over 2 years if there is positive total shareholder&#13;return (e.g. share price increase) as measured to the 5-day (January 11-15, 2021) and (January 10-14, 2022) share price Volume&#13;Weighted Average Price (&amp;#8220;VWAP&amp;#8221;).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In January of 2021, the Company issued 344,723&#13;performance-based stock options to employees and executives. The awards vest over 2 years provided there is positive total shareholder&#13;return (e.g. share price increase) as measured to the closing share price on January 14, 2022 and January 14, 2023.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company determined these awards contain&#13;a market- based condition and estimated the fair value using the Monte Carlo simulation model with the following assumptions:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Risk-free interest rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.3&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.3&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected dividend yield&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected life (in years)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected volatility&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;76.0%- 136.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;115.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;76.0%- 136.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;115.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of performance stock options under&#13;our stock incentive plans is detailed in the following table.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Remaining&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Shares&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Underlying&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Term&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;(In Years)&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 55%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Outstanding as of April 30, 2020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;81,347&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.05&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Granted&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;344,723&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.93&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Exercised&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Cancelled/forfeited&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Outstanding as of January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;426,070&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.57&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.8&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Exercisable as of January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;40,681&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.05&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;9.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As of January 31, 2021, the total intrinsic&#13;value of both outstanding and exercisable options was approximately $0.6 million and zero, respectively. As of January 31, 2021,&#13;approximately 385,389 additional options were unvested, which had an intrinsic value of $0.5 million and a weighted average remaining&#13;contractual term of 9.8 years.&amp;#160;There was approximately $26,000 and $1,600 of total recognized compensation cost related to&#13;stock options during each of the three months ended January 31, 2021 and 2020, respectively.&amp;#160;There was approximately $43,000&#13;and $1,600 of total recognized compensation cost related to stock options during each of the nine months ended January 31, 2021&#13;and 2020, respectively. As of January 31, 2021, there was approximately $0.7 million of total unrecognized compensation cost related&#13;to non-vested stock options granted under the plans. This cost is expected to be recognized over a weighted-average period of 1.8&#13;years.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Restricted Stock&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Compensation expense for non-vested restricted&#13;stock is generally recorded based on its market value on the date of grant and recognized ratably over the associated service and&#13;performance period. During the&amp;#160;three and&amp;#160;nine months ended January 31, 2021 and 2020, the Company granted 10,000 and&#13;13,513 shares subject to service-based vesting requirements.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of non-vested restricted stock under&#13;our stock incentive plans is as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Number&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average Price per&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;of Shares&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Share&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 65%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Issued and unvested at April 30, 2020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;13,513&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.48&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Granted&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.93&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Vested&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(13,513&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.48&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Cancelled/forfeited&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Issued and unvested at January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.93&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;There was approximately $2,000 and $5,000 of&#13;total recognized compensation cost related to restricted stock for the three months ended January 31, 2021 and 2020, respectively.&amp;#160;There&#13;was approximately $12,000 and $10,000 of total recognized compensation cost related to restricted stock for the nine months ended&#13;January 31, 2021 and 2020, respectively. As of January 31, 2021, there is $28,000 of unrecognized compensation cost remaining related&#13;to unvested restricted stock granted under our plans. This cost is expected to be recognized over a weighted-average period of&#13;1.0 years.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In December 2019, the Company granted 51,547&#13;shares, subject to service-based vesting requirements, to an employee that were outside the Company stock incentive plans.&amp;#160;There&#13;was approximately $5,000 and $7,000 of total recognized compensation cost related to this award for the three months ended January&#13;31, 2021 and 2020, respectively.&amp;#160;There was approximately $30,000 and $8,000 of total recognized compensation cost related&#13;to this award for the nine months ended January 31, 2021 and 2020, respectively. As of January 31, 2021, there is no unrecognized&#13;compensation cost remaining related to this award.&lt;/p&gt;</us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock>
    <us-gaap:FairValueDisclosuresTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(15) Fair Value Measurements&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;ASC Topic 820,&amp;#8221;&lt;i&gt;Fair Value Measurements&amp;#8221;&lt;/i&gt;&amp;#160;states&#13;that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability&#13;in an orderly transaction between market participants at the measurement date. Assets and liabilities that are measured at fair&#13;value are reported using a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. This hierarchy&#13;maximizes the use of observable input and minimizes the use of unobservable inputs. The following is a description of the three&#13;hierarchy levels.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 72px; text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Level 1&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&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;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Level 2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Inputs other than quoted prices in active markets that are observable for the asset or liability, either directly or indirectly.&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Level 3&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Inputs that are unobservable for the asset or liability.&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Disclosure of Fair Values&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company&amp;#8217;s financial instruments that&#13;are not re-measured at fair value include cash, cash equivalents, restricted cash, accounts receivable, contract assets and liabilities,&#13;deposits, accounts payable, and accrued expenses. The carrying values of these financial instruments approximate their fair values&#13;and are viewed as Level 1 items. The Company&amp;#8217;s warrant liabilities represent the only asset or liability classified financial&#13;instrument that is measured at fair value on a recurring basis.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The fair value of the Company&amp;#8217;s warrant&#13;liabilities (refer to Note 8) is based on the Black-Scholes option pricing model which is based on Level 3 unobservable inputs&#13;for which there is little or no market data, requiring the Company to develop its own assumptions. The assumptions used by the&#13;Company are the quoted price of the Company&amp;#8217;s common stock in an active market, risk-free interest rate, volatility and expected&#13;life, and assumes no dividends. Volatility is based on the actual market activity of the Company&amp;#8217;s stock. The expected life&#13;is based on the remaining contractual term of the warrants and the risk-free interest rate is based on the implied yield available&#13;on U.S. Treasury Securities with a maturity equivalent to the warrants&amp;#8217; expected life. The fair value on a recurring basis&#13;as of January 31, 2021 and April 30, 2020 was near zero.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Unrealized gains of approximately zero for&#13;the three months ended January 31, 2021 and 2020, respectively, and zero and $6,000 for the nine months ended January 31, 2021&#13;and 2020, respectively, were included within &amp;#8220;Gain due to change in fair value of warrant liabilities&amp;#8221; in the Consolidated&#13;Statements of Operations. The Company determined the fair value using the Black-Scholes option pricing model with the following&#13;assumptions:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 59%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Dividend rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Risk-free rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.07% - 0.08&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected life (years)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;0.5 - 0.8&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.3 - 1.4&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Expected volatility&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;146.1&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;109.8% - 130.1&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Besides the unrealized gain in fair value,&#13;there was no other activity to the balances in warrant liabilities during the nine months ended January 31, 2021 and 2020, respectively.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Transfers into or out of any hierarchy level&#13;are recognized at the end of the reporting period in which the transfers occurred. There were no transfers between any hierarchy&#13;levels during each of the nine months ended January 31, 2021 and 2020.&lt;/p&gt;</us-gaap:FairValueDisclosuresTextBlock>
    <us-gaap:CommitmentsAndContingenciesDisclosureTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(16) Commitments and Contingencies&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Employment Litigation&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On June 10, 2014, the Company announced that&#13;it had terminated Charles Dunleavy as its Chief Executive Officer and as an employee of the Company for cause, effective June 9,&#13;2014, and that Mr. Dunleavy had also been removed from his position as Chairman of the Board of Directors. On June 17, 2014, Mr.&#13;Dunleavy wrote to the Company stating that he had retained counsel to represent him in connection with an alleged wrongful termination&#13;of his employment. On July 28, 2014, Mr. Dunleavy resigned from the Board and the boards of directors of the Company&amp;#8217;s subsidiaries.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;On August 28, 2018,&#13;counsel for Mr. Dunleavy filed a demand for arbitration, captioned&amp;#160;&lt;i&gt;Charles F. Dunleavy v. Ocean Power Technologies, Inc.,&lt;/i&gt;&amp;#160;Case&#13;No. 01-18-0003-2374, before the American Arbitration Association in New Jersey. The demand names Ocean Power Technologies, Inc.&#13;as the respondent and alleges various claims and seeks declaratory relief and permanent injunction. The demand seeks damages in&#13;the amount of&amp;#160;$5.0&amp;#160;million for compensatory and punitive damages, plus interest and attorneys&amp;#8217; fees as well as&#13;certain equitable relief. On November 8, 2018, the Company through counsel responded to the demand for arbitration, denied all&#13;allegations, and asserted various affirmative defenses. The final day of hearing occurred in Princeton, New Jersey on July 15,&#13;2020. Post-hearing briefs were filed on September 22, 2020. On December 10, 2020, the panel issued an interim award that, by its&#13;express terms, is not a final award, is strictly confidential, and shall not be publicly disclosed. The parties are considering&#13;next steps. As of January 31, 2021, the Company has not accrued any provision related to this matter since any possible loss cannot&#13;be reasonably estimated. Depending on the nature of the loss, the Company believes it may be covered by insurance.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Nasdaq Delisting Notification&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On March 3, 2020, the Company received a notification&#13;from the Nasdaq indicating that the minimum bid price of the Company&amp;#8217;s common stock&amp;#160;had&amp;#160;been below $1.00 per share&#13;for 30 consecutive business days and as a result, the Company&amp;#160;was&amp;#160;not in compliance with the minimum bid price requirement&#13;for continued listing. The Nasdaq notice&amp;#160;had&amp;#160;no immediate effect on the listing or trading of the Company&amp;#8217;s common&#13;stock. Under the Nasdaq Listing Rules, the Company&amp;#160;had&amp;#160;a grace period of 180 calendar days, or until August 31, 2020,&#13;in which to regain compliance with the minimum bid price rule. To regain compliance, the closing bid price of the Company&amp;#8217;s&#13;common stock must meet or exceed $1.00 per share for a minimum of ten consecutive business days during this grace period. On August&#13;21, 2020, the Company received notification from Nasdaq that, as a result of the closing bid price of the Company&amp;#8217;s common&#13;stock being over $1.00 for 10 consecutive trading days, the Company&amp;#160;had&amp;#160;regained compliance with Listing Rule 5550(a)(2)&#13;to maintain the listing of its common stock on Nasdaq and Nasdaq considers the matter closed.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Spain Income Tax Audit&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company underwent an income tax audit&#13;in Spain for the period from 2011 to 2014, when our Spanish branch was closed. In connection with the tax audit, the Spanish tax&#13;inspector challenged the Company&amp;#8217;s recognition of grant funds received in 2011 to 2014 from the European Commission in connection&#13;with the Company&amp;#8217;s Waveport project. On July 30, 2018, the inspector concluded that although there was no tax owed in light&#13;of losses reported, the Company&amp;#8217;s Spanish branch owed penalties for failure to properly account for the income associated&#13;with the funding grant. On August 30, 2018, the Company filed an administrative appeal of the penalty and its underlying conclusions.&#13;During the three months ended July 31, 2020, the Company received notice from the Spanish Central Economic and Administrative&#13;Tribunal that it agreed with the inspector and ruled that the Company owes the full amount of the penalty in the amount of &amp;#8364;279,869.81&#13;or approximately $331,000. In the quarter ended October 31, 2020, the Company recorded an additional reserve of &amp;#8364;117,145.81&amp;#160;(or&#13;approximately $154,000)&amp;#160;to Selling, general and administrative costs in the Statement of Operations making the total reserve&#13;&amp;#8364;279,869.81, which amount was paid by the Company to the Spanish Tax Administration on January 25, 2021. At this time, the&#13;Company plans to continue appealing the decision of the Tribunal tax assessment to the Spanish National Court. As of January 31,&amp;#160;2021,&amp;#160;and&#13;April 30, 2020, the Company has reserved zero and &amp;#8364;162,724 (or approximately $177,000), respectively. The penalty was recorded&#13;in Accrued expenses in the Consolidated Balance Sheets.&lt;/p&gt;</us-gaap:CommitmentsAndContingenciesDisclosureTextBlock>
    <us-gaap:IncomeTaxDisclosureTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(17) Income Taxes&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Uncertain Tax Positions&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company applies the guidance issued by&#13;the FASB for the accounting and reporting of uncertain tax positions. The guidance requires the Company to recognize in its consolidated&#13;financial statements the impact of a tax position if that position is more likely than not to be sustained upon examination, based&#13;on the technical merits of the position. The Company is currently undergoing an income tax audit in Spain, as discussed above.&#13;At January 31, 2021, the Company had no other unrecognized tax positions. The Company does not expect any material increase or&#13;decrease in its income tax expense in the next twelve months, related to examinations or uncertain tax positions. U.S. federal&#13;and state income tax returns were audited through fiscal 2014 and fiscal 2010 respectively. Net operating loss and credit carry&#13;forwards since inception remain open to examination by taxing authorities and will continue to remain open for a period of time&#13;after utilization.&lt;/p&gt;</us-gaap:IncomeTaxDisclosureTextBlock>
    <us-gaap:SegmentReportingDisclosureTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(18) Operating Segments and Geographic Information&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company&amp;#8217;s business consists of one&#13;segment as this represents management&amp;#8217;s view of the Company&amp;#8217;s operations. The Company operates on a worldwide basis&#13;with one operating company in the US and subsidiaries in the UK and in Australia. Revenues and expenses are generally attributed&#13;to the operating unit that bills the customers. During each of the nine months ended January 31, 2021 and 2020, the Company&amp;#8217;s&#13;primary business operations were in North America.&lt;/p&gt;</us-gaap:SegmentReportingDisclosureTextBlock>
    <us-gaap:SubsequentEventsTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;&lt;b&gt;(19) Subsequent&#13;Events&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On February 1, 2021, the Company entered into&#13;a unit purchase agreement (the &amp;#8220;3dent Agreement&amp;#8221;), pursuant to which the Company acquired all of the outstanding equity&#13;interest of 3dent Technology, LLC&amp;#160;(&amp;#8220;3dent&amp;#8221;),&amp;#160;a Houston, Texas based company that offers offshore energy engineering&#13;and design services that are complementary to OPT&amp;#8217;s technology and products. In consideration for the purchase, the Company&#13;issued 361,991 shares of its common stock to the sellers with an agreed value of $800,000 based on the closing price of the Company&amp;#8217;s&#13;common stock on the date that the Company agreed to terms with 3dent. In&amp;#160;addition,&amp;#160;the former owners of 3dent will be&#13;eligible for awards of performance stock with a potential value of $360,000 if certain revenue targets are achieved over the next&#13;12 months. The 3dent Agreement includes a number of other standard representations, warranties, covenants and indemnifications.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company is accounting for the transaction&#13;as a business combination under ASC 805,&amp;#160;&lt;i&gt;&amp;#8220;Business Combinations.&amp;#8221;&amp;#160;&lt;/i&gt;Accordingly, the assets acquired&#13;and the liabilities assumed will be recorded at their estimated fair value on the date of acquisition. Goodwill from the acquisition&#13;principally relates to excess value of the purchase price over the fair value of identified net assets and liabilities. Under&#13;ASC 805, acquisition-related transaction costs (such as advisory, legal, valuation, other professional fees) have been expensed&#13;in the statement of operations in the period incurred.&lt;/p&gt;</us-gaap:SubsequentEventsTextBlock>
    <us-gaap:ConsolidationPolicyTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(a) Consolidation&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The accompanying consolidated financial statements&#13;include the accounts of the Company and its majority-owned subsidiaries. All significant intercompany balances and transactions&#13;have been eliminated in consolidation.&lt;/p&gt;</us-gaap:ConsolidationPolicyTextBlock>
    <us-gaap:UseOfEstimates contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(b) Use of Estimates&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;The preparation of&#13;the consolidated financial statements requires management of the Company to make a number of estimates and assumptions relating&#13;to the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated&#13;financial statements and the reported amounts of revenues and expenses during the period. Significant items subject to such estimates&#13;and assumptions include estimated costs to complete projects; and the input method used to measure completion over time of customer&#13;contracts for purposes of revenue recognition. Actual results could differ from those estimates.&lt;/p&gt;</us-gaap:UseOfEstimates>
    <us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(c) Cash, Cash Equivalents, Restricted&#13;Cash and Security Agreements&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Cash and Cash Equivalents&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company considers all highly liquid investments&#13;with a maturity of three months or less when purchased to be cash equivalents. The Company invests excess cash in a money market&#13;account.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 63%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Checking and savings accounts&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13; 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(&amp;#8220;Santander&amp;#8221;).&amp;#160;Cash is on deposit at Santander and serves as security for a letter of credit issued by Santander&#13;for the lease of warehouse/office space in Monroe Township, New Jersey. This agreement cannot be extended beyond July 31, 2025&#13;and is&amp;#160;cancellable&amp;#160;at the discretion of the bank. Santander also issued two letters of credit to subsidiaries of Enel&#13;Green Power (&amp;#8220;EGP&amp;#8221;) pursuant to the Company&amp;#8217;s contracts with EGP. The first letter of credit was issued in the&#13;amount of $125,690 that expires in May 2021. The second letter of credit was issued in the amount of $645,467 and reduced to $322,734&#13;in August 2020.&amp;#160;The&amp;#160;second letter of credit&amp;#160;will be&amp;#160;reduced to $64,547&amp;#160;once the PB3 PowerBuoy&lt;sup&gt;&amp;#174;&lt;/sup&gt;&amp;#160;is&#13;fully deployed and passes final acceptance testing .&amp;#160;The remaining amount expires in December 2021.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Restricted cash includes the following:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="width: 63%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Santander Bank&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;606&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;928&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;606&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;928&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following table provides a reconciliation&#13;of cash, cash equivalents and restricted cash reported within the Statement of Financial Position that sum to the total of the&#13;same such amounts shown in the Statement of Cash Flows.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 63%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Cash and cash equivalents&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79,801&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,002&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Restricted cash- short term&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;384&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;707&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Restricted cash- long term&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;222&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;221&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;80,407&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,930&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;/p&gt;</us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy>
    <us-gaap:ConcentrationRiskCreditRisk contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(d) Concentration of Credit Risk&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Financial instruments that potentially subject&#13;the Company to credit risk consist principally of accounts receivable and cash and cash equivalents. The Company believes that&#13;its credit risk is limited because the Company&amp;#8217;s current contracts are with companies with strong financial strength. The&#13;Company invests its excess cash in a money market account and does not believe that it is exposed to any significant risks related&#13;to its cash and money market accounts. Cash and cash equivalents are also maintained at foreign financial institutions. Cash and&#13;cash equivalents in foreign financial institutions as of January 31, 2021 was $0.3 million.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The table below shows the percentage of the&#13;Company&amp;#8217;s revenues derived from customers whose revenues accounted for at least 10% of the Company&amp;#8217;s consolidated revenues&#13;for at least one of the periods indicated:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="14" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Eni S.p.A.&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;34&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;42&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;135&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;118&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Premier Oil UK Limited&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;27&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;126&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;EGP&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;223&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;678&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;379&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;774&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;ACET&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;33&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;37&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Other&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;27&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;26&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;113&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;317&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;725&lt;/font&gt;&lt;/td&gt;&#13; 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    <us-gaap:ShareBasedCompensationOptionAndIncentivePlansPolicy contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;b&gt;&lt;i&gt;(e) Share-Based Compensation&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;Costs resulting from&#13;all share-based payment transactions are recognized in the consolidated financial statements at their fair values. The following&#13;table summarizes share-based compensation related to the Company&amp;#8217;s share-based plans by expense category for the three and&#13;nine months ended January 31, 2021 and 2020:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="14" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Engineering and product development&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;32&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;12&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;91&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;52&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Selling, general and administrative&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;83&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;44&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;247&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;173&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total share-based compensation expense&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;115&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;56&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;338&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;225&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white"&gt;&lt;/p&gt;</us-gaap:ShareBasedCompensationOptionAndIncentivePlansPolicy>
    <us-gaap:RevenueFromContractWithCustomerPolicyTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(f)&amp;#160;&lt;i&gt;Revenue Recognition&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A performance obligation is the unit of account&#13;for revenue recognition. The Company assesses the goods or services promised in a contract with a customer and identifies as a&#13;performance obligation either: a) a good or service (or a bundle of goods or services) that is distinct; or b) a series of distinct&#13;goods or services that are substantially the same and that have the same pattern of transfer to the customer. A contract may contain&#13;a single or multiple performance obligations. For contracts with multiple performance obligations, the Company allocates the contracted&#13;transaction price to each performance obligation based upon the relative standalone selling price, which represents the price the&#13;Company would sell a promised good or service separately to a customer. The Company determines the standalone selling price based&#13;upon the facts and circumstances of each obligated good or service. The majority of the Company&amp;#8217;s contracts have no observable&#13;standalone selling price since the associated products and services are customized to customer specifications. As such, the standalone&#13;selling price generally reflects the Company&amp;#8217;s forecast of the total cost to satisfy the performance obligation plus an appropriate&#13;profit margin.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&amp;#160;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The nature of the Company&amp;#8217;s contracts&#13;may give rise to several types of variable consideration, including unpriced change orders and liquidated damages and penalties.&#13;Variable consideration can also arise from modifications to the scope of services. Variable consideration is included in the transaction&#13;price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur once the uncertainty&#13;associated with the variable consideration is resolved. Our estimates of variable consideration and determination of whether to&#13;include such amounts in the transaction price are based largely on our assessment of legal enforceability, performance and any&#13;other information (historical, current, and forecasted) that is reasonably available to us. Accounting Standards Update (&amp;#8220;ASU&amp;#8221;)&#13;2016-10 provides a practical expedient that permits presentation of shipping and handling costs, that occur after control of the&#13;promised goods or services transfer to the customer, as fulfillment costs rather than evaluating whether the shipping and handling&#13;activities are promised services to the customer. The Company adopted this practical expedient, but it did not have a material&#13;effect on its Consolidated Financial Statements.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company recognizes revenue when or as it&#13;satisfies a performance obligation by transferring a good or service to a customer, either (1) at a point in time or (2) over time.&#13;A good or service is transferred when or as the customer obtains control of it. The evaluation of whether control of each performance&#13;obligation is transferred at a point in time or over time is made at contract inception. Input measures such as costs incurred&#13;or time elapsed are utilized to assess progress against specific contractual performance obligations for the Company&amp;#8217;s services.&#13;The selection of the method to measure progress towards completion requires judgment and is based on the nature of the services&#13;to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of progress&#13;against the performance obligations incorporated within the contractual agreements. When the Company&amp;#8217;s estimate of total&#13;costs to be incurred to satisfy the performance obligations exceed revenue, the Company recognizes the loss immediately.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company&amp;#8217;s contracts are either cost&#13;plus or fixed price contracts. Under cost plus contracts, customers are billed for actual expenses incurred plus an agreed-upon&#13;fee. Under cost plus contracts, a profit or loss on a project is recognized depending on whether actual costs are more or less&#13;than the agreed upon amount.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company has two types of fixed price contracts,&#13;firm fixed price and cost-sharing. Under firm fixed price contracts, the Company receives an agreed-upon amount for providing products&#13;and services specified in the contract, a profit or loss is recognized depending on whether actual costs are more or less than&#13;the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the customer is only intended to fund a&#13;portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding to the revenue is recorded in&#13;cost of revenues, resulting in gross profit on these contracts of zero. The Company&amp;#8217;s share of the costs is recorded as product&#13;development expense. The Company reports its disaggregation of revenue by contract type since this method best represents the Company&amp;#8217;s&#13;business. For the nine-month periods ended January 31, 2021 and 2020, all of the Company&amp;#8217;s contracts were classified as firm&#13;fixed price.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As of January 31, 2021, the Company&amp;#8217;s&#13;total remaining performance obligations, also referred to as backlog, totaled $0.5 million. The Company expects to recognize approximately&#13;89%, or $0.4 million, of the remaining performance obligations as revenue over the next twelve months.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Products and Solutions Leasing&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company enters into lease arrangements&#13;with certain customers for their products and solutions. As of January 31, 2021, the Company has one lease arrangement with a remaining&#13;operating lease term of less than 10 months. Revenue related to multiple-element arrangements is allocated to lease and non-lease&#13;elements based on their relative standalone selling prices or expected cost plus a margin approach. Lease elements generally include&#13;a PB3 PowerBuoy&lt;sup&gt;&amp;#174;&lt;/sup&gt;&amp;#160;&lt;i&gt;(&amp;#8220;&lt;/i&gt;PB3&amp;#8221;) and components, while non-lease elements generally include engineering,&#13;monitoring and support services. In the lease arrangement, the customer is provided an option to extend the lease term or purchase&#13;the leased PB3 at some point during and/or at the end of the lease term.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company classifies leases as either operating&#13;or financing in accordance with the authoritative accounting guidance contained within ASC Topic 842,&amp;#160;&lt;i&gt;&amp;#8220;Leases&amp;#8221;.&lt;/i&gt;&amp;#160;At&#13;inception of the contract, the Company evaluates the lease against the lease classification criteria within ASC Topic 842. If the&#13;direct financing or sales-type classification criteria are met, then the lease is accounted for as a finance lease. All others&#13;are treated as an operating lease.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;The Company recognizes revenue from&#13;operating lease arrangements generally on a straight-line basis over the lease term and is presented in Revenues in the Consolidated&#13;Statement of Operations. The lease income for the three and nine months ended January 31, 2021 and 2020 was immaterial.&lt;/p&gt;</us-gaap:RevenueFromContractWithCustomerPolicyTextBlock>
    <us-gaap:EarningsPerSharePolicyTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(g) Net Loss per Common Share&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Basic and diluted net loss per share for all&#13;periods presented is computed by dividing net loss by the weighted average number of shares of common stock and common stock equivalents&#13;outstanding during the period. Due to the Company&amp;#8217;s net losses, potentially dilutive securities, consisting of options to&#13;purchase shares of common stock, warrants on common stock and non-vested restricted stock issued to employees and non-employee&#13;directors, were excluded from the diluted loss per share calculation due to their anti-dilutive effect.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In computing diluted net loss per share on&#13;the Consolidated Statement of Operations, warrants on common stock, options to purchase shares of common stock and non-vested&#13;restricted stock issued to employees and non-employee directors, totaling 5,221,258 and 5,565,462 for the three and nine months&#13;ended January 31, 2021 and 2020, respectively, were excluded from each of the computations as the effect would be anti-dilutive&#13;due to the Company&amp;#8217;s net losses.&lt;/p&gt;</us-gaap:EarningsPerSharePolicyTextBlock>
    <us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;i&gt;(h) Recently Issued Accounting Standards&lt;/i&gt;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In June 2016, the Financial Accounting Standards&#13;Board (&amp;#8220;FASB&amp;#8221;) issued ASU No. 2016-13, &amp;#8220;&lt;i&gt;Financial Instruments&amp;#160;&lt;/i&gt;-&amp;#160;&lt;i&gt;Credit Losses (Topic 326),&#13;Measurement of Credit Losses on Financial Instruments.&amp;#8221;&amp;#160;&lt;/i&gt;The amendment in this update replaces the incurred loss&#13;impairment methodology in current GAAP with a methodology that reflects expected credit losses on instruments within its scope,&#13;including trade receivables. This update is intended to provide financial statement users with more decision-useful information&#13;about the expected credit losses. In November 2019, the FASB issued No. 2019-10,&amp;#160;&lt;i&gt;Financial Instruments&amp;#8212;Credit Losses&#13;(Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842)&lt;/i&gt;, which deferred the effective date of ASU 2016-13&#13;for Smaller Reporting Companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal&#13;years. The Company is currently evaluating the impact the adoption of ASU 2016-13 will have on its consolidated financial statements.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In August 2018, the FASB issued ASU No. 2018-13,&amp;#160;&lt;i&gt;&amp;#8220;Fair&#13;Value Measurement (Topic 820).&amp;#8221;&amp;#160;&lt;/i&gt;The ASU modifies, removes, and adds several disclosure requirements on fair value&#13;measurements in Topic 820, Fair Value Measurement. The amendments on changes in unrealized gains and losses, the range and weighted&#13;average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement&#13;uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year&#13;of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The Company&#13;adopted this guidance effective May 1, 2020. The adoption of the guidance did not have a material effect on its Consolidated Financial&#13;Statements.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In August 2018, the FASB issued ASU No. 2018-15,&#13;&amp;#8220;&lt;i&gt;Intangibles&amp;#160;&lt;/i&gt;&amp;#8212;&amp;#160;&lt;i&gt;Goodwill and Other&amp;#160;&lt;/i&gt;&amp;#8212;&amp;#160;&lt;i&gt;Internal-Use Software (Subtopic 350-40):&#13;Customer&amp;#8217;s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.&amp;#8221;&lt;/i&gt;&amp;#160;The&#13;ASU requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance&#13;in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. The ASU&#13;permits two methods of adoption: prospectively to all implementation costs incurred after the date of adoption, or retrospectively&#13;to each prior reporting period presented. The Company adopted this guidance on a prospective basis effective May 1, 2020. The&#13;adoption of the guidance did not have a material effect on its Consolidated Financial Statements.&lt;/p&gt;</us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock>
    <us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company considers all highly liquid investments&#13;with a maturity of three months or less when purchased to be cash equivalents. The Company invests excess cash in a money market&#13;account.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 63%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Checking and savings accounts&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2,597&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,551&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Money market account&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;77,204&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;8,451&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79,801&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,002&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;&lt;/b&gt;&lt;/p&gt;</us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock>
    <us-gaap:ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The table below shows the percentage of the&#13;Company&amp;#8217;s revenues derived from customers whose revenues accounted for at least 10% of the Company&amp;#8217;s consolidated revenues&#13;for at least one of the periods indicated:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13; 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text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;34&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;42&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;135&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13; 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   &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;126&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;EGP&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;223&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;678&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;379&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;774&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;ACET&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;33&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;37&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Other&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;27&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;26&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;113&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;317&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;725&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;604&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,131&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt"&gt;&lt;/p&gt;</us-gaap:ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock>
    <us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"&gt;The following table&#13;summarizes share-based compensation related to the Company&amp;#8217;s share-based plans by expense category for the three and nine&#13;months ended January 31, 2021 and 2020:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="14" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Engineering and product development&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;32&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;12&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;91&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;52&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Selling, general and administrative&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;83&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;44&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;247&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;173&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total share-based compensation expense&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;115&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;56&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;338&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;225&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white"&gt;&lt;/p&gt;</us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock>
    <OPTT:ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following provides further details on the&#13;balance sheet accounts of accounts receivable, contract assets, and contract liabilities from contracts with customers:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 63%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Accounts receivable&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;105&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Contract assets&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;63&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;251&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Contract liabilities&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;75&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;165&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;/p&gt;</OPTT:ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock>
    <us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Significant changes in the contract assets&#13;balances during the period are as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 77%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Transferred to receivables from contract assets recognized at the beginning of the period&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 19%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(251&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Revenue recognized and not billed as of the end of the period&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;63&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Net change in contract assets&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(188&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;i&gt;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Significant changes in the contract liabilities&#13;balances during the period are as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 77%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Revenue recognized that was included in the contract liabilities balance as of the beginning of the period&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 19%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(84&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Transferred to contract assets from contract liabilities recognized at the beginning of the period&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(6&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Net change in contract liabilities&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(90&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;/p&gt;</us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock>
    <us-gaap:OtherCurrentAssetsTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;(4) Other Current Assets&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Other current assets consist of the following&#13;at January 31, 2021 and April 30, 2020:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 62%; text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Deposits&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 16%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;126&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;60&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Other receivables&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;244&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Prepaid insurance&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;411&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;124&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Prepaid offering costs&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;56&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;275&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Prepaid expenses- other&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;164&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;127&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,001&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;588&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;/p&gt;</us-gaap:OtherCurrentAssetsTextBlock>
    <us-gaap:PropertyPlantAndEquipmentTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The components of property and equipment, net&#13;as of January 31, 2021 and April 30, 2020 consisted of the following:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 63%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Equipment&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;342&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;342&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Computer equipment &amp;#38; software&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;502&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;486&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Office furniture &amp;#38; equipment&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;339&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;339&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Leasehold improvements&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;474&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;474&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Construction in process&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;15&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;15&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,672&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,656&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Less: accumulated depreciation&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(1,255&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(1,157&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;417&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;499&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;/p&gt;</us-gaap:PropertyPlantAndEquipmentTextBlock>
    <us-gaap:LeaseCostTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify"&gt;The components of lease expense&#13;in the Consolidated Statement of Operations for both the three and nine months ended January 31, 2021 and 2020 was as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Three months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Nine months ended January 31,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="14" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Operating lease cost&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 12%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;238&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;238&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Short-term lease cost&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;7&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;12&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total lease cost&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;86&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;79&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;250&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;238&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;&lt;/p&gt;</us-gaap:LeaseCostTableTextBlock>
    <OPTT:ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;Information related to the Company&amp;#8217;s&#13;right-of use assets and lease liabilities as of January 31, 2021 was as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;u&gt;Operating lease:&lt;/u&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="width: 80%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Operating right-of-use asset, net&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,005&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-left: 10pt"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Right-of-use liability- current&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;252&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-left: 10pt"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Right-of-use liability- long term&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;887&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total lease liability&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,139&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Weighted average remaining lease term- operating leases&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;3.72 years&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Weighted average discount rate- operating leases&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;8.5&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&lt;/b&gt;&lt;/p&gt;</OPTT:ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock>
    <us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"&gt;Total remaining lease payments under&#13;the Company&amp;#8217;s operating leases are as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 75%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Remainder of fiscal year 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 22%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;84&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2022&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;341&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2023&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;352&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2024&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;362&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2025&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total future minimum lease payments&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,323&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Less imputed interest&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Total&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,139&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;b&gt;&lt;/b&gt;&lt;/p&gt;</us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock>
    <us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Accrued expenses consist of the following at&#13;January 31, 2021 and April 30, 2020:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;April 30, 2020&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(in thousands)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 59%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Project costs&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;95&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;48&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Contract loss reserve&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;425&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;216&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Employee incentive payments&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;407&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Accrued salary and benefits&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;831&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;483&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Legal and accounting fees&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;403&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;283&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Accrued taxes payable&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;177&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Other&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;179&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;146&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2,340&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1,353&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;/p&gt;</us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock>
    <us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of non-vested restricted stock under&#13;our stock incentive plans is as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Number&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Average Price per&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;of Shares&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;Share&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 65%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Issued and unvested at April 30, 2020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 2%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;13,513&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 17%; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.48&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Granted&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.93&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Vested&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;(13,513&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;1.48&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Cancelled/forfeited&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;Issued and unvested at January 31, 2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;10,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;2.93&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;/p&gt;</us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock>
    <OPTT:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock contextRef="From2020-05-01to2021-01-31">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company determined the fair value using&#13;the Black-Scholes option pricing model with the following assumptions:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font: 10pt Times New Roman, Times, Serif"&gt;&lt;b&gt;January 31, 2021&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13; 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    <import namespace="http://fasb.org/us-types/2020-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2020/elts/us-types-2020-01-31.xsd" />
    <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
    <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
    <import namespace="http://xbrl.sec.gov/country/2020-01-31" schemaLocation="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd" />
    <import namespace="http://xbrl.sec.gov/currency/2020-01-31" schemaLocation="https://xbrl.sec.gov/currency/2020/currency-2020-01-31.xsd" />
    <import namespace="http://fasb.org/srt/2020-01-31" schemaLocation="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd" />
    <import namespace="http://fasb.org/srt-types/2020-01-31" schemaLocation="http://xbrl.fasb.org/srt/2020/elts/srt-types-2020-01-31.xsd" />
    <element id="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne" name="StockIssuedDuringPeriodSharesNewIssuesOne" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_StockIssuedDuringPeriodValueNewIssuesOne" name="StockIssuedDuringPeriodValueNewIssuesOne" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts" name="ExerciseOfPrefundedWarrantsNetOfIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares" name="ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ProceedsFromPaycheckProtectionProgramLoan" name="ProceedsFromPaycheckProtectionProgramLoan" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_IncreaseDecreaseInLeaseLiability" name="IncreaseDecreaseInLeaseLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee" name="StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ProceedsFromRepaymentsOfPrefundedWarrants" name="ProceedsFromRepaymentsOfPrefundedWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" name="AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises" name="OutstandingReceivableForSaleOfSharesFromWarrantExercises" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises" name="OutstandingReceivableForSaleOfSharesFromStockOptionExercises" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ExerciseOfCommonWarrantsNetOfCosts" name="ExerciseOfCommonWarrantsNetOfCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares" name="ExerciseOfCommonWarrantsNetOfCostsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_ProceedsFromInitialPublicOffering" name="ProceedsFromInitialPublicOffering" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PaymentOfSalesCommission" name="PaymentOfSalesCommission" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee" name="StockIssuedDuringPeriodValueIssuedForCommitmentFee" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval" name="PercentageOfOutstandingCommonStockLimitForShareholderApproval" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage" name="StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_RevenueRemainingPerformancesObligationPercentage" name="RevenueRemainingPerformancesObligationPercentage" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths" name="ContractReceivablesDueAfterNextRollingTwelveMonths" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PrepaidOfferingCosts" name="PrepaidOfferingCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights" name="ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_NumberOfExercisedWarrants" name="NumberOfExercisedWarrants" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_DebtForgivenessDescription" name="DebtForgivenessDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PayrollProtectionFlexibilityDescription" name="PayrollProtectionFlexibilityDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_InsuranceFundingAmount" name="InsuranceFundingAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_StockOptionsVestingPeriodDescription" name="StockOptionsVestingPeriodDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks" name="UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_WarrantDisclosureTextBlock" name="WarrantDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock" name="ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock" name="ScheduleOfRightofUseAssetsAndLeaseLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock" name="ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_StockSubscriptionReceivable" name="StockSubscriptionReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval" name="NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_PlacementAgentsMember" name="PlacementAgentsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PlacementAgentFeesMember" name="PlacementAgentFeesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PocketAndLegalExpensesMember" name="PocketAndLegalExpensesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SecondAmendedPurchaseAgreementMember" name="SecondAmendedPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OfferingAgreementMember" name="OfferingAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OneAgreementMember" name="OneAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_BarclaysBankMember" name="BarclaysBankMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_CheckingAndSavingsAccountsMember" name="CheckingAndSavingsAccountsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OvernightRepurchaseAccountMember" name="OvernightRepurchaseAccountMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_MoneyMarketAccountMember" name="MoneyMarketAccountMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_BarclaysBankAgreementMember" name="BarclaysBankAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_RestrictedCashMember" name="RestrictedCashMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_MitsuiEngineeringAndShipBuildingMember" name="MitsuiEngineeringAndShipBuildingMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_USDepartmentOfDefenseOfficeOfNavalResearchMember" name="USDepartmentOfDefenseOfficeOfNavalResearchMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OfficeOfNavalResearchMember" name="OfficeOfNavalResearchMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ProductDevelopmentMember" name="ProductDevelopmentMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ServiceBasedVestingMember" name="ServiceBasedVestingMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PerformanceBasedVestingMember" name="PerformanceBasedVestingMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_WarrantLiabilityMember" name="WarrantLiabilityMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_StipulationMember" name="StipulationMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ReverseStockSplitMember" name="ReverseStockSplitMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_MonroeTownshipMember" name="MonroeTownshipMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_StockIncentivePlanTwoThousandAndSixMember" name="StockIncentivePlanTwoThousandAndSixMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_StockIncentivePlanTwoThousandAndFifteenMember" name="StockIncentivePlanTwoThousandAndFifteenMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_TwoThousandAndEighteenInducementPlanMember" name="TwoThousandAndEighteenInducementPlanMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_NavalResearchMember" name="NavalResearchMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SantanderBankMember" name="SantanderBankMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_EquipmentUnderCapitalizedLeaseMember" name="EquipmentUnderCapitalizedLeaseMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ComputerEquipmentAndSoftwareMember" name="ComputerEquipmentAndSoftwareMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OPTAMember" name="OPTAMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_NewJerseyBoardOfPublicUtilities1Member" name="NewJerseyBoardOfPublicUtilities1Member" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OfficeFurnitureAndEquipmentMember" name="OfficeFurnitureAndEquipmentMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_GeorgeWTaylorMember" name="GeorgeWTaylorMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SternLawsuitMember" name="SternLawsuitMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_AsiaAndAustraliaMember" name="AsiaAndAustraliaMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_PremierOilUKLimitedMember" name="PremierOilUKLimitedMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_IncomeTaxReformsMember" name="IncomeTaxReformsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SeptemberEleventhTwoThousandandEighteenMember" name="SeptemberEleventhTwoThousandandEighteenMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_AmountsExcludingEffectOfAdoptionMember" name="AmountsExcludingEffectOfAdoptionMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_AspireCapitalFundLLCMember" name="AspireCapitalFundLLCMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_EnelGreenPowerMember" name="EnelGreenPowerMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_CharlesFDunleavyMember" name="CharlesFDunleavyMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_MarketOfferingAgreementMember" name="MarketOfferingAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_TwoThousandNinteenATMFacilityMember" name="TwoThousandNinteenATMFacilityMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
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    <element id="OPTT_MayOneTwoThousandNineteenMember" name="MayOneTwoThousandNineteenMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SettlementAgreementAndReleaseMember" name="SettlementAgreementAndReleaseMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_WittichBrosMarineIncMember" name="WittichBrosMarineIncMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PreFundedWarrantsMember" name="PreFundedWarrantsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_UndesignatedPreferredSharesMember" name="UndesignatedPreferredSharesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
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</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.CAL
<SEQUENCE>8
<FILENAME>optt-20210131_cal.xml
<DESCRIPTION>XBRL CALCULATION FILE
<TEXT>
<XBRL>
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<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>10
<FILENAME>optt-20210131_lab.xml
<DESCRIPTION>XBRL LABEL FILE
<TEXT>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xml:lang="en-US">Property, Plant and Equipment, Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquipmentMember" xlink:label="us-gaap_EquipmentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquipmentMember" xlink:to="us-gaap_EquipmentMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquipmentMember_lbl" xml:lang="en-US">Equipment [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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 &amp; Software [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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 &amp; Equipment [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="us-gaap_LeaseholdImprovementsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeaseholdImprovementsMember" xlink:to="us-gaap_LeaseholdImprovementsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xml:lang="en-US">Leasehold Improvements [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ConstructionInProcessMember" xlink:label="OPTT_ConstructionInProcessMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ConstructionInProcessMember" xlink:to="OPTT_ConstructionInProcessMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ConstructionInProcessMember_lbl" xml:lang="en-US">Construction in Process [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_AwardTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardTypeAxis_lbl" xml:lang="en-US">Award Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_NonVestedRestrictedStockMember" xlink:label="OPTT_NonVestedRestrictedStockMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NonVestedRestrictedStockMember" xlink:to="OPTT_NonVestedRestrictedStockMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NonVestedRestrictedStockMember_lbl" xml:lang="en-US">Non-vested Restricted Stock [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="us-gaap_IncomeStatementLocationAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementLocationAxis" xlink:to="us-gaap_IncomeStatementLocationAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xml:lang="en-US">Income Statement Location [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="us-gaap_SellingGeneralAndAdministrativeExpensesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:to="us-gaap_SellingGeneralAndAdministrativeExpensesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SellingGeneralAndAdministrativeExpensesMember_lbl" xml:lang="en-US">Selling, General and Administrative [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityNameAxis" xlink:label="us-gaap_IncomeTaxAuthorityNameAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxAuthorityNameAxis" xlink:to="us-gaap_IncomeTaxAuthorityNameAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxAuthorityNameAxis_lbl" xml:lang="en-US">Income Tax Authority, Name [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TaxAuthoritySpainMember" xlink:label="us-gaap_TaxAuthoritySpainMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TaxAuthoritySpainMember" xlink:to="us-gaap_TaxAuthoritySpainMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TaxAuthoritySpainMember_lbl" xml:lang="en-US">Tax Authority, Spain [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockPurchaseAgreementMember" xlink:label="OPTT_StockPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockPurchaseAgreementMember" xlink:to="OPTT_StockPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockPurchaseAgreementMember_lbl" xml:lang="en-US">Stock Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LegalEntityAxis" xlink:to="dei_LegalEntityAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_LegalEntityAxis_lbl" xml:lang="en-US">Legal Entity [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AspireCapitalFundLLCMember" xlink:label="OPTT_AspireCapitalFundLLCMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AspireCapitalFundLLCMember" xlink:to="OPTT_AspireCapitalFundLLCMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AspireCapitalFundLLCMember_lbl" xml:lang="en-US">Aspire Capital Fund, LLC [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_RangeAxis" xlink:to="srt_RangeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_RangeAxis_lbl" xml:lang="en-US">Range [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MaximumMember" xlink:to="srt_MaximumMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MaximumMember_lbl" xml:lang="en-US">Maximum [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="us-gaap_EmployeeStockOptionMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeStockOptionMember" xlink:to="us-gaap_EmployeeStockOptionMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xml:lang="en-US">Employee Stock Option [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementScenarioAxis" xlink:label="srt_StatementScenarioAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_StatementScenarioAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_StatementScenarioAxis_lbl" xml:lang="en-US">Scenario [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PerformancceBasedStockOptionsMember" xlink:label="OPTT_PerformancceBasedStockOptionsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PerformancceBasedStockOptionsMember" xlink:to="OPTT_PerformancceBasedStockOptionsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PerformancceBasedStockOptionsMember_lbl" xml:lang="en-US">Performance-based Stock Options [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_TitleOfIndividualAxis_lbl" xml:lang="en-US">Title of Individual [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_TwoExecutivesMember" xlink:label="OPTT_TwoExecutivesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoExecutivesMember" xlink:to="OPTT_TwoExecutivesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_TwoExecutivesMember_lbl" xml:lang="en-US">Two Executives [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockIncentivePlanMember" xlink:label="OPTT_StockIncentivePlanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIncentivePlanMember" xlink:to="OPTT_StockIncentivePlanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIncentivePlanMember_lbl" xml:lang="en-US">Stock Incentive Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_TwoThousandNinteenATMFacilityMember" xlink:label="OPTT_TwoThousandNinteenATMFacilityMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoThousandNinteenATMFacilityMember" xlink:to="OPTT_TwoThousandNinteenATMFacilityMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_TwoThousandNinteenATMFacilityMember_lbl" xml:lang="en-US">2019 ATM Facility [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AGPAllianceGlobalPartnersMember" xlink:label="OPTT_AGPAllianceGlobalPartnersMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AGPAllianceGlobalPartnersMember" xlink:to="OPTT_AGPAllianceGlobalPartnersMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AGPAllianceGlobalPartnersMember_lbl" xml:lang="en-US">Alliance Global Partners [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_RestrictedCashAndSecurityAgreementsMember" xlink:label="OPTT_RestrictedCashAndSecurityAgreementsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_RestrictedCashAndSecurityAgreementsMember" xlink:to="OPTT_RestrictedCashAndSecurityAgreementsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_RestrictedCashAndSecurityAgreementsMember_lbl" xml:lang="en-US">Restricted Cash and Security Agreements [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis" xlink:label="us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis" xlink:to="us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_lbl" xml:lang="en-US">Legal Entity of Counterparty, Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermDebtTypeAxis_lbl" xml:lang="en-US">Short-term Debt, Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_LetterOneMember" xlink:label="OPTT_LetterOneMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_LetterOneMember" xlink:to="OPTT_LetterOneMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_LetterOneMember_lbl" xml:lang="en-US">Letter 1 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_LetterTwoMember" xlink:label="OPTT_LetterTwoMember" />
      <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="optt-20210131.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:to="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xml:lang="en-US">Concentration Risk Benchmark [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesRevenueNetMember" xlink:label="us-gaap_SalesRevenueNetMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SalesRevenueNetMember" xlink:to="us-gaap_SalesRevenueNetMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SalesRevenueNetMember_lbl" xml:lang="en-US">Sales Revenue, Net [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="us-gaap_ConcentrationRiskByTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConcentrationRiskByTypeAxis" xlink:to="us-gaap_ConcentrationRiskByTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConcentrationRiskByTypeAxis_lbl" xml:lang="en-US">Concentration Risk Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CustomerConcentrationRiskMember" xlink:label="us-gaap_CustomerConcentrationRiskMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CustomerConcentrationRiskMember" xlink:to="us-gaap_CustomerConcentrationRiskMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CustomerConcentrationRiskMember_lbl" xml:lang="en-US">Customer Concentration Risk [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MajorCustomersAxis" xlink:label="srt_MajorCustomersAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MajorCustomersAxis" xlink:to="srt_MajorCustomersAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MajorCustomersAxis_lbl" xml:lang="en-US">Customer [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EniSPAMember" xlink:label="OPTT_EniSPAMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EniSPAMember" xlink:to="OPTT_EniSPAMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EniSPAMember_lbl" xml:lang="en-US">Eni S.P.A [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PremierOilUKLimitedMember" xlink:label="OPTT_PremierOilUKLimitedMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PremierOilUKLimitedMember" xlink:to="OPTT_PremierOilUKLimitedMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PremierOilUKLimitedMember_lbl" xml:lang="en-US">Premier Oil UK Limited [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EGPMember" xlink:label="OPTT_EGPMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EGPMember" xlink:to="OPTT_EGPMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EGPMember_lbl" xml:lang="en-US">EGP [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OtherMember" xlink:label="OPTT_OtherMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OtherMember" xlink:to="OPTT_OtherMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_OtherMember_lbl" xml:lang="en-US">Other [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EngineeringAndProductDevelopmentMember" xlink:label="OPTT_EngineeringAndProductDevelopmentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EngineeringAndProductDevelopmentMember" xlink:to="OPTT_EngineeringAndProductDevelopmentMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EngineeringAndProductDevelopmentMember_lbl" xml:lang="en-US">Engineering and Product Development [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="srt_StatementGeographicalAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_StatementGeographicalAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_StatementGeographicalAxis_lbl" xml:lang="en-US">Geographical [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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="optt-20210131.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="optt-20210131.xsd#OPTT_SixMonthsAfterDisbursementDateMember" xlink:label="OPTT_SixMonthsAfterDisbursementDateMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SixMonthsAfterDisbursementDateMember" xlink:to="OPTT_SixMonthsAfterDisbursementDateMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_SixMonthsAfterDisbursementDateMember_lbl" xml:lang="en-US">6 Months After Disbursement Date [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="us-gaap_RestrictedStockMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedStockMember" xlink:to="us-gaap_RestrictedStockMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedStockMember_lbl" xml:lang="en-US">Restricted Stock [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EmployeeMember" xlink:label="OPTT_EmployeeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeeMember" xlink:to="OPTT_EmployeeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EmployeeMember_lbl" xml:lang="en-US">Employee [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_SubjectToServiceBasedVestingRequirementsMember" xlink:label="OPTT_SubjectToServiceBasedVestingRequirementsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SubjectToServiceBasedVestingRequirementsMember" xlink:to="OPTT_SubjectToServiceBasedVestingRequirementsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_SubjectToServiceBasedVestingRequirementsMember_lbl" xml:lang="en-US">Subject to Service- Based Vesting Requirements [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MinimumMember" xlink:to="srt_MinimumMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MinimumMember_lbl" xml:lang="en-US">Minimum [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EURMember" xlink:label="OPTT_EURMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EURMember" xlink:to="OPTT_EURMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_EURMember_lbl" xml:lang="en-US">Euro [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioForecastMember" xlink:label="srt_ScenarioForecastMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_ScenarioForecastMember" xlink:to="srt_ScenarioForecastMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_ScenarioForecastMember_lbl" xml:lang="en-US">Forecast [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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.sec.gov/currency/2020/currency-2020-01-31.xsd#currency_EUR" xlink:label="currency_EUR" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="currency_EUR" xlink:to="currency_EUR_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="currency_EUR_lbl" xml:lang="en-US">Euro [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="us-gaap_SubsequentEventTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xml:lang="en-US">Subsequent Event Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="us-gaap_SubsequentEventMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventMember" xlink:to="us-gaap_SubsequentEventMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventMember_lbl" xml:lang="en-US">Subsequent Event [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_UnitPurchaseAgreementMember" xlink:label="OPTT_UnitPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_UnitPurchaseAgreementMember" xlink:to="OPTT_UnitPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_UnitPurchaseAgreementMember_lbl" xml:lang="en-US">Unit Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xml:lang="en-US">Business Acquisition [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ThreedentTechnologyLLCMember" xlink:label="OPTT_ThreedentTechnologyLLCMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ThreedentTechnologyLLCMember" xlink:to="OPTT_ThreedentTechnologyLLCMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ThreedentTechnologyLLCMember_lbl" xml:lang="en-US">3dent Technology, LLC [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PerformanceStockOptionsMember" xlink:label="OPTT_PerformanceStockOptionsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PerformanceStockOptionsMember" xlink:to="OPTT_PerformanceStockOptionsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PerformanceStockOptionsMember_lbl" xml:lang="en-US">Performance Stock Options [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_FormerOwnersMember" xlink:label="OPTT_FormerOwnersMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_FormerOwnersMember" xlink:to="OPTT_FormerOwnersMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_FormerOwnersMember_lbl" xml:lang="en-US">Former Owners [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_TwoThousandTwentyATMFacilityMember" xlink:label="OPTT_TwoThousandTwentyATMFacilityMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoThousandTwentyATMFacilityMember" xlink:to="OPTT_TwoThousandTwentyATMFacilityMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_TwoThousandTwentyATMFacilityMember_lbl" xml:lang="en-US">2020 ATM Facility [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ACETMember" xlink:label="OPTT_ACETMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ACETMember" xlink:to="OPTT_ACETMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ACETMember_lbl" xml:lang="en-US">ACET [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockOptionMember" xlink:label="us-gaap_StockOptionMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockOptionMember" xlink:to="us-gaap_StockOptionMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockOptionMember_lbl" xml:lang="en-US">Stock Option [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_RecordedAdditionalPenaltyMember" xlink:label="OPTT_RecordedAdditionalPenaltyMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_RecordedAdditionalPenaltyMember" xlink:to="OPTT_RecordedAdditionalPenaltyMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_RecordedAdditionalPenaltyMember_lbl" xml:lang="en-US">Recorded Additional Penalty [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockSubscriptionReceivableMember" xlink:label="OPTT_StockSubscriptionReceivableMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockSubscriptionReceivableMember" xlink:to="OPTT_StockSubscriptionReceivableMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockSubscriptionReceivableMember_lbl" xml:lang="en-US">Stock Subscription Receivable [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardDateAxis" xlink:label="us-gaap_AwardDateAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardDateAxis" xlink:to="us-gaap_AwardDateAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardDateAxis_lbl" xml:lang="en-US">Award Date [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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-20210131.xsd#OPTT_StockPurchaseAgreementOneMember" xlink:label="OPTT_StockPurchaseAgreementOneMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockPurchaseAgreementOneMember" xlink:to="OPTT_StockPurchaseAgreementOneMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_StockPurchaseAgreementOneMember_lbl" xml:lang="en-US">Stock Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="us-gaap_PerformanceSharesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PerformanceSharesMember" xlink:to="us-gaap_PerformanceSharesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_PerformanceSharesMember_lbl" xml:lang="en-US">Performance Stock Options [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_DocumentAndEntityInformationAbstract" xlink:label="OPTT_DocumentAndEntityInformationAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DocumentAndEntityInformationAbstract" xlink:to="OPTT_DocumentAndEntityInformationAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_DocumentAndEntityInformationAbstract_lbl" xml:lang="en-US">Document And Entity Information</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US">Entity Registrant Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US">Entity Central Index Key</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentType" xlink:label="dei_DocumentType" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentType_lbl" xml:lang="en-US">Document Type</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US">Document Period End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.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/2020/dei-2020-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US">Current Fiscal Year End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.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's Reporting Status Current</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.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/2020/dei-2020-01-31.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/2020/dei-2020-01-31.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 Flag</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.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/2020/dei-2020-01-31.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/2020/dei-2020-01-31.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/2020/dei-2020-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US">Document Fiscal Period Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US">Document Fiscal Year Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="us-gaap_StatementOfFinancialPositionAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="us-gaap_AssetsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsAbstract_lbl" xml:lang="en-US">ASSETS</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="us-gaap_AssetsCurrentAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_AssetsCurrentAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xml:lang="en-US">Current assets:</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US">Cash and cash equivalents</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashCurrent" xlink:label="us-gaap_RestrictedCashCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedCashCurrent" xlink:to="us-gaap_RestrictedCashCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedCashCurrent_lbl" xml:lang="en-US">Restricted cash, short-term</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="us-gaap_AccountsReceivableNetCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsReceivableNetCurrent" xlink:to="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xml:lang="en-US">Accounts receivable</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerAssetNetCurrent" xlink:to="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xml:lang="en-US">Contract assets</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="us-gaap_OtherAssetsCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsCurrent" xlink:to="us-gaap_OtherAssetsCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xml:lang="en-US">Other current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="us-gaap_AssetsCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AssetsCurrent_lbl" xml:lang="en-US">Total current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="us-gaap_PropertyPlantAndEquipmentNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentNet" xlink:to="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xml:lang="en-US">Property and equipment, net</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseRightOfUseAsset" xlink:to="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xml:lang="en-US">Right-of-use asset, net</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashNoncurrent" xlink:label="us-gaap_RestrictedCashNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedCashNoncurrent" xlink:to="us-gaap_RestrictedCashNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedCashNoncurrent_lbl" xml:lang="en-US">Restricted cash, long-term</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xml:lang="en-US">LIABILITIES AND STOCKHOLDERS' EQUITY</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansPayableCurrent" xlink:label="us-gaap_LoansPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LoansPayableCurrent" xlink:to="us-gaap_LoansPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LoansPayableCurrent_lbl" xml:lang="en-US">Loan payable</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="us-gaap_AccruedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedLiabilitiesCurrent" xlink:to="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xml:lang="en-US">Accrued expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerLiabilityCurrent" xlink:to="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xml:lang="en-US">Contract liabilities, current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityCurrent" xlink:to="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xml:lang="en-US">Right-of-use liability, current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilitiesCurrent" xlink:label="us-gaap_DerivativeLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DerivativeLiabilitiesCurrent" xlink:to="us-gaap_DerivativeLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DerivativeLiabilitiesCurrent_lbl" xml:lang="en-US">Warrant liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PaycheckProtectionProgramLoanCurrent" xlink:label="OPTT_PaycheckProtectionProgramLoanCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaycheckProtectionProgramLoanCurrent" xlink:to="OPTT_PaycheckProtectionProgramLoanCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PaycheckProtectionProgramLoanCurrent_lbl" xml:lang="en-US">Paycheck protection program loan- current</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="us-gaap_LiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xml:lang="en-US">Total current liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PaycheckProtectionProgramLoanNonCurrent" xlink:label="OPTT_PaycheckProtectionProgramLoanNonCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaycheckProtectionProgramLoanNonCurrent" xlink:to="OPTT_PaycheckProtectionProgramLoanNonCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PaycheckProtectionProgramLoanNonCurrent_lbl" xml:lang="en-US">Paycheck protection program loan, less current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:to="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xml:lang="en-US">Right-of-use liability, less current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalLeaseObligationsCurrent" xlink:label="us-gaap_CapitalLeaseObligationsCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CapitalLeaseObligationsCurrent" xlink:to="us-gaap_CapitalLeaseObligationsCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CapitalLeaseObligationsCurrent_lbl" xml:lang="en-US">Contract liabilities, less current portion</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US">Total liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="us-gaap_CommitmentsAndContingencies" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingencies" xlink:to="us-gaap_CommitmentsAndContingencies_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xml:lang="en-US">Commitments and contingencies (Note 16)</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="us-gaap_StockholdersEquityAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xml:lang="en-US">Stockholders' Equity:</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="us-gaap_PreferredStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockValue" xlink:to="us-gaap_PreferredStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockValue_lbl" xml:lang="en-US">Preferred stock, $0.001 par value; authorized 5,000,000 shares, none issued or outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockValue" xlink:to="us-gaap_CommonStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockValue_lbl" xml:lang="en-US">Common stock, $0.001 par value; authorized 100,000,000 shares, issued 50,589,809 and 12,939,420 shares, respectively</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="us-gaap_TreasuryStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockValue" xlink:to="us-gaap_TreasuryStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_TreasuryStockValue_lbl" xml:lang="en-US">Treasury stock, at cost; 21,040 and 4,251 shares, respectively</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="us-gaap_AdditionalPaidInCapital" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapital" xlink:to="us-gaap_AdditionalPaidInCapital_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xml:lang="en-US">Additional paid-in capital</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockSubscriptionReceivable" xlink:label="OPTT_StockSubscriptionReceivable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockSubscriptionReceivable" xlink:to="OPTT_StockSubscriptionReceivable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockSubscriptionReceivable_lbl" xml:lang="en-US">Stock subscription receivable</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xml:lang="en-US">Accumulated deficit</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xml:lang="en-US">Accumulated other comprehensive loss</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="us-gaap_StockholdersEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US">Total stockholders' equity</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US">Total liabilities and stockholders' equity</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockParOrStatedValuePerShare" xlink:to="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xml:lang="en-US">Preferred stock, par value</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="us-gaap_PreferredStockSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesAuthorized" xlink:to="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xml:lang="en-US">Preferred stock, shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="us-gaap_PreferredStockSharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesIssued" xlink:to="us-gaap_PreferredStockSharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xml:lang="en-US">Preferred stock, shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="us-gaap_PreferredStockSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesOutstanding" xlink:to="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xml:lang="en-US">Preferred stock, shares outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xml:lang="en-US">Common stock, par value</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="us-gaap_CommonStockSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesAuthorized" xlink:to="us-gaap_CommonStockSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xml:lang="en-US">Common stock, shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xml:lang="en-US">Common stock, shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="us-gaap_TreasuryStockShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockShares" xlink:to="us-gaap_TreasuryStockShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TreasuryStockShares_lbl" xml:lang="en-US">Treasury stock, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="us-gaap_IncomeStatementAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_IncomeStatementAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xml:lang="en-US">Income Statement [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:to="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xml:lang="en-US">Revenues</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="us-gaap_CostOfRevenue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CostOfRevenue" xlink:to="us-gaap_CostOfRevenue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CostOfRevenue_lbl" xml:lang="en-US">Cost of revenues</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GrossProfit" xlink:label="us-gaap_GrossProfit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GrossProfit" xlink:to="us-gaap_GrossProfit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_GrossProfit_lbl" xml:lang="en-US">Gross profit/(loss)</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="us-gaap_OperatingExpensesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpensesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xml:lang="en-US">Operating expenses:</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost" xlink:label="us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost" xlink:to="us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_lbl" xml:lang="en-US">Engineering and product development costs</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="us-gaap_SellingGeneralAndAdministrativeExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SellingGeneralAndAdministrativeExpense" xlink:to="us-gaap_SellingGeneralAndAdministrativeExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SellingGeneralAndAdministrativeExpense_lbl" xml:lang="en-US">Selling, general and administrative costs</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="us-gaap_OperatingExpenses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US">Total operating expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAdjustmentOfWarrants" xlink:label="us-gaap_FairValueAdjustmentOfWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAdjustmentOfWarrants" xlink:to="us-gaap_FairValueAdjustmentOfWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_FairValueAdjustmentOfWarrants_lbl" xml:lang="en-US">Gain due to the change in fair value of warrant liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="us-gaap_InterestIncomeExpenseNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestIncomeExpenseNet" xlink:to="us-gaap_InterestIncomeExpenseNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestIncomeExpenseNet_lbl" xml:lang="en-US">Interest income, net</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="us-gaap_OtherNonoperatingIncomeExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherNonoperatingIncomeExpense" xlink:to="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xml:lang="en-US">Other expense, net</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareBasicAndDiluted_lbl" xml:lang="en-US">Basic and diluted net loss per share</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:to="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_lbl" xml:lang="en-US">Weighted average shares used to compute basic and diluted net loss per share</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:to="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl" xml:lang="en-US">Statement of Comprehensive Income [Abstract]</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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:to="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_lbl" xml:lang="en-US">Foreign currency translation adjustment</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US">Total comprehensive loss</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US">Statement [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementLineItems_lbl" xml:lang="en-US">Statement [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_StockholdersEquity_2_lbl" xml:lang="en-US">Balance</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="us-gaap_SharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_SharesOutstanding_lbl" xml:lang="en-US">Balance, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xml:lang="en-US">Share-based compensation</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xml:lang="en-US">Proceeds from stock options exercises</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xml:lang="en-US">Proceeds from stock options exercises, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_lbl" xml:lang="en-US">Issuance (forfeiture) of restricted stock, net</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:to="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xml:lang="en-US">Issuance (forfeiture) of restricted stock, net, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts" xlink:label="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts" xlink:to="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts_lbl" xml:lang="en-US">Exercise of prefunded warrants, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares" xlink:label="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares" xlink:to="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares_lbl" xml:lang="en-US">Exercise of prefunded warrants, net of issuance costs shares</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xml:lang="en-US">Common stock issued for commitment fee</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xml:lang="en-US">Common stock issued for commitment fee, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ExerciseOfCommonWarrantsNetOfCosts" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCosts" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCosts_lbl" xml:lang="en-US">Exercise of common warrants, net of costs</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ExerciseOfCommonWarrantsNetOfCostsShares" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares" xlink:to="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares_lbl" xml:lang="en-US">Exercise of common warrants, net of costs, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockIssuedDuringPeriodValueNewIssuesOne" xlink:label="OPTT_StockIssuedDuringPeriodValueNewIssuesOne" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodValueNewIssuesOne" xlink:to="OPTT_StockIssuedDuringPeriodValueNewIssuesOne_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIssuedDuringPeriodValueNewIssuesOne_lbl" xml:lang="en-US">Issuance of common stock- Aspire financing, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockIssuedDuringPeriodSharesNewIssuesOne" xlink:label="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne" xlink:to="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne_lbl" xml:lang="en-US">Issuance of common stock- Aspire financing, net of issuance costs, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueOther" xlink:label="us-gaap_StockIssuedDuringPeriodValueOther" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueOther" xlink:to="us-gaap_StockIssuedDuringPeriodValueOther_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueOther_lbl" xml:lang="en-US">Issuance of common stock- AGP At The Market offering, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesOther" xlink:label="us-gaap_StockIssuedDuringPeriodSharesOther" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesOther" xlink:to="us-gaap_StockIssuedDuringPeriodSharesOther_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesOther_lbl" xml:lang="en-US">Issuance of common stock- AGP At The Market offering, net of issuance costs, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="us-gaap_TreasuryStockValueAcquiredCostMethod" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_TreasuryStockValueAcquiredCostMethod_lbl" xml:lang="en-US">Acquisition of treasury stock</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="us-gaap_TreasuryStockSharesAcquired" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockSharesAcquired" xlink:to="us-gaap_TreasuryStockSharesAcquired_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TreasuryStockSharesAcquired_lbl" xml:lang="en-US">Acquisition of treasury stock, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xml:lang="en-US">Other comprehensive gain/(loss)</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_StockholdersEquity_3_lbl" xml:lang="en-US">Balance</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">Balance, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="us-gaap_StatementOfCashFlowsAbstract" />
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      <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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Cash flows from operating activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Adjustments to reconcile net loss to net cash used in operating activities:</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:to="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_2_lbl" xml:lang="en-US">Foreign exchange (gain)/loss</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="us-gaap_DepreciationDepletionAndAmortization" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepreciationDepletionAndAmortization" xlink:to="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xml:lang="en-US">Depreciation of fixed assets</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense" xlink:to="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_lbl" xml:lang="en-US">Amortization of right of use asset</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="us-gaap_ShareBasedCompensation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensation" xlink:to="us-gaap_ShareBasedCompensation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensation_lbl" xml:lang="en-US">Compensation expense related to stock option grants and restricted stock</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAdjustmentOfWarrants" xlink:to="us-gaap_FairValueAdjustmentOfWarrants_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAdjustmentOfWarrants_2_lbl" xml:lang="en-US">Gain due to the change in fair value of warrant liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:to="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xml:lang="en-US">Loss on disposal of property, plant and equipment</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xml:lang="en-US">Changes in operating assets and liabilities:</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:to="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xml:lang="en-US">Accounts receivable</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xml:lang="en-US">Contract assets</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:to="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xml:lang="en-US">Other assets</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsPayable" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xml:lang="en-US">Accounts payable</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:to="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xml:lang="en-US">Accrued expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_IncreaseDecreaseInLeaseLiability" xlink:label="OPTT_IncreaseDecreaseInLeaseLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncreaseDecreaseInLeaseLiability" xlink:to="OPTT_IncreaseDecreaseInLeaseLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_IncreaseDecreaseInLeaseLiability_lbl" xml:lang="en-US">Change in lease liability</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xml:lang="en-US">Contract liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xml:lang="en-US">Net cash used in operating activities</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US">Cash flows from investing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireProductiveAssets" xlink:to="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xml:lang="en-US">Purchase of property, plant and equipment</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xml:lang="en-US">Net cash used in investing activities</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US">Cash flows from financing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ProceedsFromPaycheckProtectionProgramLoan" xlink:label="OPTT_ProceedsFromPaycheckProtectionProgramLoan" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProceedsFromPaycheckProtectionProgramLoan" xlink:to="OPTT_ProceedsFromPaycheckProtectionProgramLoan_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ProceedsFromPaycheckProtectionProgramLoan_lbl" xml:lang="en-US">Proceeds from Paycheck Protection Program Loan</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromConstructionLoansPayable" xlink:label="us-gaap_ProceedsFromConstructionLoansPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromConstructionLoansPayable" xlink:to="us-gaap_ProceedsFromConstructionLoansPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromConstructionLoansPayable_lbl" xml:lang="en-US">Proceeds from loan payable</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfDebt" xlink:label="us-gaap_RepaymentsOfDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfDebt" xlink:to="us-gaap_RepaymentsOfDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_RepaymentsOfDebt_lbl" xml:lang="en-US">Payment of loan payable</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="us-gaap_ProceedsFromStockOptionsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromStockOptionsExercised" xlink:to="us-gaap_ProceedsFromStockOptionsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xml:lang="en-US">Proceeds from stock option exercises</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US">Proceeds from issuance of common stock- Aspire financing net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:label="us-gaap_ProceedsFromIssuanceInitialPublicOffering" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:to="us-gaap_ProceedsFromIssuanceInitialPublicOffering_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceInitialPublicOffering_lbl" xml:lang="en-US">Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromWarrantExercises" xlink:label="us-gaap_ProceedsFromWarrantExercises" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromWarrantExercises" xlink:to="us-gaap_ProceedsFromWarrantExercises_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromWarrantExercises_lbl" xml:lang="en-US">Proceeds associated with exercise of common stock warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ProceedsFromRepaymentsOfPrefundedWarrants" xlink:label="OPTT_ProceedsFromRepaymentsOfPrefundedWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProceedsFromRepaymentsOfPrefundedWarrants" xlink:to="OPTT_ProceedsFromRepaymentsOfPrefundedWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ProceedsFromRepaymentsOfPrefundedWarrants_lbl" xml:lang="en-US">Proceeds (costs) associated with exercise of pre-funded warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:to="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xml:lang="en-US">Acquisition of treasury stock</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xml:lang="en-US">Net cash provided by financing activities</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US">Effect of exchange rate changes on cash, cash equivalents and restricted cash</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xml:lang="en-US">Net increase/(decrease) in cash, cash equivalents and restricted cash</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xml:lang="en-US">Cash, cash equivalents and restricted cash, beginning of period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_2_lbl" xml:lang="en-US">Cash, cash equivalents and restricted cash, end of period</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SupplementalCashFlowElementsAbstract" xlink:label="us-gaap_SupplementalCashFlowElementsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SupplementalCashFlowElementsAbstract" xlink:to="us-gaap_SupplementalCashFlowElementsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SupplementalCashFlowElementsAbstract_lbl" xml:lang="en-US">Supplemental disclosure of noncash operating activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PrepaidFinancingCostsReportedInAccruedExpenses" xlink:label="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses" xlink:to="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses_lbl" xml:lang="en-US">Prepaid financing costs reported in accrued expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoncashInvestingAndFinancingItemsAbstract" xlink:label="us-gaap_NoncashInvestingAndFinancingItemsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NoncashInvestingAndFinancingItemsAbstract" xlink:to="us-gaap_NoncashInvestingAndFinancingItemsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NoncashInvestingAndFinancingItemsAbstract_lbl" xml:lang="en-US">Supplemental disclosure of noncash investing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" xlink:label="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" xlink:to="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable_lbl" xml:lang="en-US">Acquisition of property, plant and equipment through accounts payable</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_NoncashFinancingItemsAbstract" xlink:label="OPTT_NoncashFinancingItemsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NoncashFinancingItemsAbstract" xlink:to="OPTT_NoncashFinancingItemsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NoncashFinancingItemsAbstract_lbl" xml:lang="en-US">Supplemental disclosure of noncash financing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee" xlink:label="OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee" xlink:to="OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee_lbl" xml:lang="en-US">Common stock issued for payment of commitment fee</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram_lbl" xml:lang="en-US">Outstanding receivable for sale of shares through AGP at the Market program</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises_lbl" xml:lang="en-US">Outstanding receivable for sale of shares from warrant exercises</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises_lbl" xml:lang="en-US">Outstanding receivable for sale of shares from stock option exercises</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="us-gaap_AccountingPoliciesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_AccountingPoliciesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:to="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xml:lang="en-US">Background, Basis of Presentation and Liquidity</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xml:lang="en-US">Summary of Significant Accounting Policies</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract" xlink:label="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract" xlink:to="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract_lbl" xml:lang="en-US">Account Receivable Contract Assets And Contract Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" xlink:to="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract_lbl" xml:lang="en-US">Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCurrentAssetsTextBlock" xlink:label="us-gaap_OtherCurrentAssetsTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherCurrentAssetsTextBlock" xlink:to="us-gaap_OtherCurrentAssetsTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherCurrentAssetsTextBlock_lbl" xml:lang="en-US">Other Current Assets</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract_lbl" xml:lang="en-US">Property, Plant and Equipment [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:to="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_lbl" xlink:type="arc" />
      <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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="us-gaap_LeasesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeasesAbstract" xlink:to="us-gaap_LeasesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LeasesAbstract_lbl" xml:lang="en-US">Leases [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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/label" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_lbl" xml:lang="en-US">Leases</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PayablesAndAccrualsAbstract" xlink:label="us-gaap_PayablesAndAccrualsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PayablesAndAccrualsAbstract" xlink:to="us-gaap_PayablesAndAccrualsAbstract_lbl" xlink:type="arc" />
      <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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WarrantsAndRightsNoteDisclosureAbstract" xlink:label="us-gaap_WarrantsAndRightsNoteDisclosureAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsAndRightsNoteDisclosureAbstract" xlink:to="us-gaap_WarrantsAndRightsNoteDisclosureAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantsAndRightsNoteDisclosureAbstract_lbl" xml:lang="en-US">Warrants and Rights Note Disclosure [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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/label" xlink:label="OPTT_WarrantDisclosureTextBlock_lbl" xml:lang="en-US">Warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTextBlock" xlink:label="us-gaap_ShortTermDebtTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermDebtTextBlock" xlink:to="us-gaap_ShortTermDebtTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermDebtTextBlock_lbl" xml:lang="en-US">Loan Payable</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-20210131.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock" xlink:label="us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock" xlink:to="us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_lbl" xml:lang="en-US">Schedule of Future Minimum Lease Payments Under Operating Lease</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" xlink:to="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xml:lang="en-US">Schedule of Accrued Expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:to="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_lbl" xml:lang="en-US">Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" xlink:label="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" xlink:to="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock_lbl" xml:lang="en-US">Schedule of Stock Option Activity</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" xlink:label="us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" xlink:to="us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_lbl" xml:lang="en-US">Schedule of Non-vested Restricted Stock Activity</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock" xlink:label="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock" xlink:to="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_lbl" xml:lang="en-US">Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TypeOfArrangementAxis" xlink:to="us-gaap_TypeOfArrangementAxis_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_TypeOfArrangementAxis_2_lbl" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Axis]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_RangeAxis" xlink:to="srt_RangeAxis_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="srt_RangeAxis_2_lbl" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_2_lbl" xml:lang="en-US">Net cash used in operating activities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_2_lbl" xml:lang="en-US">Unrestricted cash and cash equivalents</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ProceedsFromInitialPublicOffering" xlink:label="OPTT_ProceedsFromInitialPublicOffering" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProceedsFromInitialPublicOffering" xlink:to="OPTT_ProceedsFromInitialPublicOffering_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ProceedsFromInitialPublicOffering_lbl" xml:lang="en-US">Aggregate offering price</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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-20210131.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-20210131.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-20210131.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 limit for shareholder approval</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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">Number of shares can be issued based upon outstanding percentage</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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">Number of additional shares that can be issued upon shareholder approval</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="us-gaap_LettersOfCreditOutstandingAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LettersOfCreditOutstandingAmount" xlink:to="us-gaap_LettersOfCreditOutstandingAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LettersOfCreditOutstandingAmount_lbl" xml:lang="en-US">Letters of credit outstanding, amount</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityExpirationDate1" xlink:label="us-gaap_LineOfCreditFacilityExpirationDate1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityExpirationDate1" xlink:to="us-gaap_LineOfCreditFacilityExpirationDate1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityExpirationDate1_lbl" xml:lang="en-US">Line of credit expiration period</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation" xlink:label="us-gaap_RevenueRemainingPerformanceObligation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueRemainingPerformanceObligation" xlink:to="us-gaap_RevenueRemainingPerformanceObligation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueRemainingPerformanceObligation_lbl" xml:lang="en-US">Revenue remaining performance obligation</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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="optt-20210131.xsd#OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths" xlink:label="OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths" xlink:to="OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths_lbl" xml:lang="en-US">Performance obligation revenue of next twelve months</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xml:lang="en-US">Antidilutive securities excluded from computation of earnings per share, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCash" xlink:label="us-gaap_RestrictedCash" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedCash" xlink:to="us-gaap_RestrictedCash_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedCash_lbl" xml:lang="en-US">Restricted Cash</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_3_lbl" xml:lang="en-US">Cash and Cash Equivalents</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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensation" xlink:to="us-gaap_ShareBasedCompensation_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensation_2_lbl" xml:lang="en-US">Total share-based compensation expense</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract" xlink:to="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract_2_lbl" xml:lang="en-US">Account Receivable Contract Assets And Contract Liabilities - 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="us-gaap_ContractWithCustomerLiabilityCurrent" xlink:to="us-gaap_ContractWithCustomerLiabilityCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_2_lbl" xml:lang="en-US">Contract liabilities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract" xlink:to="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract_3_lbl" xml:lang="en-US">Account Receivable Contract Assets And Contract Liabilities - Schedule Of Significant Changes In Contract Assets And Contract Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerAssetNet" xlink:label="us-gaap_ContractWithCustomerAssetNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerAssetNet" xlink:to="us-gaap_ContractWithCustomerAssetNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:label="us-gaap_ContractWithCustomerAssetNet_lbl" xml:lang="en-US">Transferred to receivables from contract assets recognized at the beginning of the period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerAssetNet" xlink:to="us-gaap_ContractWithCustomerAssetNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ContractWithCustomerAssetNet_2_lbl" xml:lang="en-US">Revenue recognized and not billed as of the end of the period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_2_lbl" xml:lang="en-US">Net change in contract assets</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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/negatedPeriodStartLabel" 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: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/2009/role/negatedPeriodEndLabel" xlink:label="us-gaap_ContractWithCustomerLiability_2_lbl" xml:lang="en-US">Transferred to contract assets from contract liabilities recognized at the beginning of the period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" 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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepositsAssetsCurrent" xlink:label="us-gaap_DepositsAssetsCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DepositsAssetsCurrent" xlink:to="us-gaap_DepositsAssetsCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DepositsAssetsCurrent_lbl" xml:lang="en-US">Deposits</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="us-gaap_OtherReceivablesNetCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherReceivablesNetCurrent" xlink:to="us-gaap_OtherReceivablesNetCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherReceivablesNetCurrent_lbl" xml:lang="en-US">Other receivables</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidInsurance" xlink:label="us-gaap_PrepaidInsurance" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PrepaidInsurance" xlink:to="us-gaap_PrepaidInsurance_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PrepaidInsurance_lbl" xml:lang="en-US">Prepaid insurance</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PrepaidOfferingCosts" xlink:label="OPTT_PrepaidOfferingCosts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidOfferingCosts" xlink:to="OPTT_PrepaidOfferingCosts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PrepaidOfferingCosts_lbl" xml:lang="en-US">Prepaid offering costs</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherPrepaidExpenseCurrent" xlink:label="us-gaap_OtherPrepaidExpenseCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherPrepaidExpenseCurrent" xlink:to="us-gaap_OtherPrepaidExpenseCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherPrepaidExpenseCurrent_lbl" xml:lang="en-US">Prepaid expenses- other</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsCurrent" xlink:to="us-gaap_OtherAssetsCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OtherAssetsCurrent_2_lbl" xml:lang="en-US">Other current assets</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Depreciation" xlink:label="us-gaap_Depreciation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Depreciation" xlink:to="us-gaap_Depreciation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Depreciation_lbl" xml:lang="en-US">Depreciation expense</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_2_lbl" xml:lang="en-US">Long-Lived Tangible Asset [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="us-gaap_PropertyPlantAndEquipmentGross" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentGross" xlink:to="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xml:lang="en-US">Property and equipment, gross</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:to="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xml:lang="en-US">Less: accumulated depreciation</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentNet" xlink:to="us-gaap_PropertyPlantAndEquipmentNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_2_lbl" xml:lang="en-US">Property and equipment, net</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseTermOfContract" xlink:to="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xml:lang="en-US">Term of lease</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseOptionToExtend" xlink:label="us-gaap_LesseeOperatingLeaseOptionToExtend" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseOptionToExtend" xlink:to="us-gaap_LesseeOperatingLeaseOptionToExtend_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseOptionToExtend_lbl" xml:lang="en-US">Option to extend lease</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="us-gaap_OperatingLeasePayments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeasePayments" xlink:to="us-gaap_OperatingLeasePayments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeasePayments_lbl" xml:lang="en-US">Operating leases cash payments</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="us-gaap_OperatingLeaseCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseCost" xlink:to="us-gaap_OperatingLeaseCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseCost_lbl" xml:lang="en-US">Operating lease cost</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="us-gaap_ShortTermLeaseCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermLeaseCost" xlink:to="us-gaap_ShortTermLeaseCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermLeaseCost_lbl" xml:lang="en-US">Short-term lease cost</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCost" xlink:label="us-gaap_LeaseCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeaseCost" xlink:to="us-gaap_LeaseCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LeaseCost_lbl" xml:lang="en-US">Total lease cost</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="us-gaap_OperatingLeaseLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiability" xlink:to="us-gaap_OperatingLeaseLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xml:lang="en-US">Total lease liability</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:to="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xml:lang="en-US">Weighted average remaining lease term- operating leases</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:to="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xml:lang="en-US">Weighted average discount rate- operating leases</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_lbl" xml:lang="en-US">Remainder of fiscal year 2021</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xml:lang="en-US">2022</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xml:lang="en-US">2023</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xml:lang="en-US">2024</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xml:lang="en-US">2025</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsDue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsDue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsDue_lbl" xml:lang="en-US">Total future minimum lease payments</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xml:lang="en-US">Less imputed interest</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiability" xlink:to="us-gaap_OperatingLeaseLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiability_2_lbl" xml:lang="en-US">Total</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionPayableCurrent" xlink:label="us-gaap_ConstructionPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConstructionPayableCurrent" xlink:to="us-gaap_ConstructionPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConstructionPayableCurrent_lbl" xml:lang="en-US">Project costs</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingencyAccrualCarryingValueCurrent" xlink:label="us-gaap_LossContingencyAccrualCarryingValueCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingencyAccrualCarryingValueCurrent" xlink:to="us-gaap_LossContingencyAccrualCarryingValueCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingencyAccrualCarryingValueCurrent_lbl" xml:lang="en-US">Contract loss reserve</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherEmployeeRelatedLiabilitiesCurrent" xlink:label="us-gaap_OtherEmployeeRelatedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherEmployeeRelatedLiabilitiesCurrent" xlink:to="us-gaap_OtherEmployeeRelatedLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherEmployeeRelatedLiabilitiesCurrent_lbl" xml:lang="en-US">Employee incentive payments</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedSalariesCurrent" xlink:label="us-gaap_AccruedSalariesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedSalariesCurrent" xlink:to="us-gaap_AccruedSalariesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedSalariesCurrent_lbl" xml:lang="en-US">Accrued salary and benefits</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedProfessionalFeesCurrent" xlink:label="us-gaap_AccruedProfessionalFeesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedProfessionalFeesCurrent" xlink:to="us-gaap_AccruedProfessionalFeesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedProfessionalFeesCurrent_lbl" xml:lang="en-US">Legal and accounting fees</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="us-gaap_AccruedIncomeTaxesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedIncomeTaxesCurrent" xlink:to="us-gaap_AccruedIncomeTaxesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedIncomeTaxesCurrent_lbl" xml:lang="en-US">Accrued taxes payable</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAccruedLiabilitiesCurrent" xlink:to="us-gaap_OtherAccruedLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent_lbl" xml:lang="en-US">Other</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedLiabilitiesCurrent" xlink:to="us-gaap_AccruedLiabilitiesCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AccruedLiabilitiesCurrent_2_lbl" xml:lang="en-US">Accrued expenses total</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights" xlink:label="OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights" xlink:to="OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights_lbl" xml:lang="en-US">Warrant to purchase shares common stock</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:to="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xml:lang="en-US">Warrant exercise price per share</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WarrantsAndRightsOutstandingTerm" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsAndRightsOutstandingTerm" xlink:to="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xml:lang="en-US">Class of warrant or right, expiration period</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_NumberOfExercisedWarrants" xlink:label="OPTT_NumberOfExercisedWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NumberOfExercisedWarrants" xlink:to="OPTT_NumberOfExercisedWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NumberOfExercisedWarrants_lbl" xml:lang="en-US">Number of exercised warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromLoanOriginations1" xlink:label="us-gaap_ProceedsFromLoanOriginations1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromLoanOriginations1" xlink:to="us-gaap_ProceedsFromLoanOriginations1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromLoanOriginations1_lbl" xml:lang="en-US">Proceeds from loan</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xml:lang="en-US">Debt instrument, interest rate</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="us-gaap_RepaymentsOfLongTermDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfLongTermDebt" xlink:to="us-gaap_RepaymentsOfLongTermDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RepaymentsOfLongTermDebt_lbl" xml:lang="en-US">Repayments of loan</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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="optt-20210131.xsd#OPTT_PayrollProtectionFlexibilityDescription" xlink:label="OPTT_PayrollProtectionFlexibilityDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PayrollProtectionFlexibilityDescription" xlink:to="OPTT_PayrollProtectionFlexibilityDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PayrollProtectionFlexibilityDescription_lbl" xml:lang="en-US">Payroll protection flexibility, description</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_InsuranceFundingAmount" xlink:label="OPTT_InsuranceFundingAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_InsuranceFundingAmount" xlink:to="OPTT_InsuranceFundingAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_InsuranceFundingAmount_lbl" xml:lang="en-US">Insurance funding amount</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InsuranceCommissionsAndFees" xlink:label="us-gaap_InsuranceCommissionsAndFees" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InsuranceCommissionsAndFees" xlink:to="us-gaap_InsuranceCommissionsAndFees_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InsuranceCommissionsAndFees_lbl" xml:lang="en-US">Insurance monthly payment</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfDebt" xlink:to="us-gaap_RepaymentsOfDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_RepaymentsOfDebt_2_lbl" xml:lang="en-US">Repayments of loan</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockSharesAcquired" xlink:to="us-gaap_TreasuryStockSharesAcquired_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_TreasuryStockSharesAcquired_2_lbl" xml:lang="en-US">Treasury stock, shares, acquired</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xml:lang="en-US">Share-based compensation arrangement by share-based payment award, number of shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:to="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xml:lang="en-US">Stock based compensation shares, available for grant</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xml:lang="en-US">Number of shares granted during the period</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xml:lang="en-US">Share-based compensation intrinsic value of outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xml:lang="en-US">Share-based compensation options, exercisable intrinsic value</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xml:lang="en-US">Share-based compensation unvested shares of stock options</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_lbl" xml:lang="en-US">Share-based compensation unvested shares of stock options intrinsic value</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US">Share-based compensation weighted average remaining contractual term</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AllocatedShareBasedCompensationExpense" xlink:to="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xml:lang="en-US">Share-based compensation expense</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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 related to non-vested stock options</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xml:lang="en-US">Share-based compensation cost expected to recognize weighted-average term</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockOptionsVestingPeriodDescription" xlink:label="OPTT_StockOptionsVestingPeriodDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockOptionsVestingPeriodDescription" xlink:to="OPTT_StockOptionsVestingPeriodDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockOptionsVestingPeriodDescription_lbl" xml:lang="en-US">Stock options vesting period, description</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xml:lang="en-US">Restricted stock options, granted during period</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks" xlink:label="OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks" xlink:to="OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks_lbl" xml:lang="en-US">Unrecognized compensation cost remaining related to unvested restricted stock</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xml:lang="en-US">Risk-free interest rate</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xml:lang="en-US">Expected dividend yield</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xml:lang="en-US">Expected life (in years)</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xml:lang="en-US">Expected volatility</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Beginning</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_2_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Granted</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Exercised</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_lbl" xml:lang="en-US">Shares Underlying Options Outstanding, Cancelled/forfeited</link:label>
      <link: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:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" 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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Beginning Balance</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Granted</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Exercised</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_lbl" xml:lang="en-US">Weighted Average Exercise Price, Cancelled/forfeited</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" 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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xml:lang="en-US">Weighted Average Remaining Contractual Term (In Years), Beginning</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.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="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US">Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xml:lang="en-US">Number of Shares, Issued and unvested, Beginning</link:label>
      <link: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 Shares, Granted</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xml:lang="en-US">Number of Shares, Vested</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xml:lang="en-US">Number of Shares, Cancelled/forfeited</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2_lbl" xml:lang="en-US">Number of Shares, Issued and Unvested, Ending</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Price per Share, Issued and Unvested, Beginning</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Price per Share, Granted</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Price per Share, Vested</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted Average Price per Share, Cancelled/forfeited</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2_lbl" xml:lang="en-US">Weighted Average Price per Share, Issued and Unvested, Ending</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="us-gaap_LossContingencyDamagesSoughtValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingencyDamagesSoughtValue" xlink:to="us-gaap_LossContingencyDamagesSoughtValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingencyDamagesSoughtValue_lbl" xml:lang="en-US">Damages sought value</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesIssuedPricePerShare" xlink:label="us-gaap_SharesIssuedPricePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssuedPricePerShare" xlink:to="us-gaap_SharesIssuedPricePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xml:lang="en-US">Share price per share</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_NasdaqDelistingNotificationDescription" xlink:label="OPTT_NasdaqDelistingNotificationDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NasdaqDelistingNotificationDescription" xlink:to="OPTT_NasdaqDelistingNotificationDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_NasdaqDelistingNotificationDescription_lbl" xml:lang="en-US">Nasdaq delisting notification description</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued" xlink:label="us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued" xlink:to="us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued_lbl" xml:lang="en-US">Income tax examination, penalties and interest accrued</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="us-gaap_UnrecognizedTaxBenefits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnrecognizedTaxBenefits" xlink:to="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xml:lang="en-US">Uncertain tax positions</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="us-gaap_NumberOfReportableSegments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NumberOfReportableSegments" xlink:to="us-gaap_NumberOfReportableSegments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xml:lang="en-US">Number of reportable segments</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:to="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xml:lang="en-US">Number of shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned" xlink:label="us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned" xlink:to="us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_lbl" xml:lang="en-US">Agreed value</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PotentialValue" xlink:label="OPTT_PotentialValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PotentialValue" xlink:to="OPTT_PotentialValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_PotentialValue_lbl" xml:lang="en-US">Potential value</link:label>
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription_lbl" xml:lang="en-US">Stock awards description</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:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AGPMember" xlink:label="OPTT_AGPMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AGPMember" xlink:to="OPTT_AGPMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AGPMember_doc" xml:lang="en-US">AGP [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:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AllianceGlobalPartnersMember" xlink:label="OPTT_AllianceGlobalPartnersMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AllianceGlobalPartnersMember" xlink:to="OPTT_AllianceGlobalPartnersMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AllianceGlobalPartnersMember_doc" xml:lang="en-US">Alliance Global Partners [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AmountsExcludingEffectOfAdoptionMember" xlink:label="OPTT_AmountsExcludingEffectOfAdoptionMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AmountsExcludingEffectOfAdoptionMember" xlink:to="OPTT_AmountsExcludingEffectOfAdoptionMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AmountsExcludingEffectOfAdoptionMember_doc" xml:lang="en-US">Amounts Excluding Effect of Adoption [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AsiaAndAustraliaMember" xlink:label="OPTT_AsiaAndAustraliaMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AsiaAndAustraliaMember" xlink:to="OPTT_AsiaAndAustraliaMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AsiaAndAustraliaMember_doc" xml:lang="en-US">Asia and australia [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:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AtTheMarketOfferingAgreementMember" xlink:label="OPTT_AtTheMarketOfferingAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AtTheMarketOfferingAgreementMember" xlink:to="OPTT_AtTheMarketOfferingAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AtTheMarketOfferingAgreementMember_doc" xml:lang="en-US">At the Market Offering Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_AugustThirtyTwoThousandAndEighteenMember" xlink:label="OPTT_AugustThirtyTwoThousandAndEighteenMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_AugustThirtyTwoThousandAndEighteenMember" xlink:to="OPTT_AugustThirtyTwoThousandAndEighteenMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AugustThirtyTwoThousandAndEighteenMember_doc" xml:lang="en-US">August 30, 2018 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_BarclaysBankAgreementMember" xlink:label="OPTT_BarclaysBankAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BarclaysBankAgreementMember" xlink:to="OPTT_BarclaysBankAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_BarclaysBankAgreementMember_doc" xml:lang="en-US">Barclays bank agreement [member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_BarclaysBankMember" xlink:label="OPTT_BarclaysBankMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_BarclaysBankMember" xlink:to="OPTT_BarclaysBankMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_BarclaysBankMember_doc" xml:lang="en-US">Barclays Bank [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CharlesFDunleavyMember" xlink:to="OPTT_CharlesFDunleavyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_CharlesFDunleavyMember_doc" xml:lang="en-US">Charles F. Dunleavy [Member]</link:label>
      <link: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_ComputerEquipmentAndSoftwareMember" xlink:to="OPTT_ComputerEquipmentAndSoftwareMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ComputerEquipmentAndSoftwareMember_doc" xml:lang="en-US">Computer Equipment &amp;amp;amp; Software [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ConstructionInProcessMember" xlink:to="OPTT_ConstructionInProcessMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ConstructionInProcessMember_doc" xml:lang="en-US">Construction in Process [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_CostPlusMember" xlink:label="OPTT_CostPlusMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CostPlusMember" xlink:to="OPTT_CostPlusMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_CostPlusMember_doc" xml:lang="en-US">Cost Plus [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_CostSharingMember" xlink:label="OPTT_CostSharingMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_CostSharingMember" xlink:to="OPTT_CostSharingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_CostSharingMember_doc" xml:lang="en-US">Cost Sharing [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_DecemberTwentyTwoThousandandNineteenMember" xlink:label="OPTT_DecemberTwentyTwoThousandandNineteenMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_DecemberTwentyTwoThousandandNineteenMember" xlink:to="OPTT_DecemberTwentyTwoThousandandNineteenMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_DecemberTwentyTwoThousandandNineteenMember_doc" xml:lang="en-US">December 20, 2019 [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EGPMember" xlink:to="OPTT_EGPMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EGPMember_doc" xml:lang="en-US">EGP [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EURMember" xlink:to="OPTT_EURMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EURMember_doc" xml:lang="en-US">Euro [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EffectOfAdoptionMember" xlink:label="OPTT_EffectOfAdoptionMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EffectOfAdoptionMember" xlink:to="OPTT_EffectOfAdoptionMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EffectOfAdoptionMember_doc" xml:lang="en-US">Effect of Adoption [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EmployeePerformanceStockOptionsMember" xlink:label="OPTT_EmployeePerformanceStockOptionsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeePerformanceStockOptionsMember" xlink:to="OPTT_EmployeePerformanceStockOptionsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EmployeePerformanceStockOptionsMember_doc" xml:lang="en-US">Performance Stock Option [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EnelGreenPowerMember" xlink:label="OPTT_EnelGreenPowerMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EnelGreenPowerMember" xlink:to="OPTT_EnelGreenPowerMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EnelGreenPowerMember_doc" xml:lang="en-US">Enel Green Power [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EniSPAMember" xlink:to="OPTT_EniSPAMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EniSPAMember_doc" xml:lang="en-US">Eni S.p.A [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EquipmentUnderCapitalizedLeaseMember" xlink:label="OPTT_EquipmentUnderCapitalizedLeaseMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EquipmentUnderCapitalizedLeaseMember" xlink:to="OPTT_EquipmentUnderCapitalizedLeaseMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EquipmentUnderCapitalizedLeaseMember_doc" xml:lang="en-US">Equipment Under Capitalized Lease [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_FirmFixedPriceMember" xlink:label="OPTT_FirmFixedPriceMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_FirmFixedPriceMember" xlink:to="OPTT_FirmFixedPriceMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_FirmFixedPriceMember_doc" xml:lang="en-US">Firm Fixed Price [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_FixedPriceMember" xlink:label="OPTT_FixedPriceMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_FixedPriceMember" xlink:to="OPTT_FixedPriceMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_FixedPriceMember_doc" xml:lang="en-US">Fixed Price [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:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_GeorgeWTaylorMember" xlink:label="OPTT_GeorgeWTaylorMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_GeorgeWTaylorMember" xlink:to="OPTT_GeorgeWTaylorMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_GeorgeWTaylorMember_doc" xml:lang="en-US">George W. Taylor [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_IncomeTaxReformsMember" xlink:label="OPTT_IncomeTaxReformsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_IncomeTaxReformsMember" xlink:to="OPTT_IncomeTaxReformsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_IncomeTaxReformsMember_doc" xml:lang="en-US">Income Tax Reforms [Member]</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">Change in lease liability.</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:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_MarchTwentyTwentMember" xlink:label="OPTT_MarchTwentyTwentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MarchTwentyTwentMember" xlink:to="OPTT_MarchTwentyTwentMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MarchTwentyTwentMember_doc" xml:lang="en-US">March 2020 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_MarketOfferingAgreementMember" xlink:label="OPTT_MarketOfferingAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MarketOfferingAgreementMember" xlink:to="OPTT_MarketOfferingAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MarketOfferingAgreementMember_doc" xml:lang="en-US">Market Offering Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_MayOneTwoThousandNineteenMember" xlink:label="OPTT_MayOneTwoThousandNineteenMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MayOneTwoThousandNineteenMember" xlink:to="OPTT_MayOneTwoThousandNineteenMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MayOneTwoThousandNineteenMember_doc" xml:lang="en-US">May 01, 2019 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_MayTwentyTwentMember" xlink:label="OPTT_MayTwentyTwentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MayTwentyTwentMember" xlink:to="OPTT_MayTwentyTwentMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MayTwentyTwentMember_doc" xml:lang="en-US">May 2020 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_MitsuiEngineeringAndShipBuildingMember" xlink:label="OPTT_MitsuiEngineeringAndShipBuildingMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MitsuiEngineeringAndShipBuildingMember" xlink:to="OPTT_MitsuiEngineeringAndShipBuildingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MitsuiEngineeringAndShipBuildingMember_doc" xml:lang="en-US">Related to the customer Mitsui Engineering and Ship Building.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MoneyMarketAccountMember" xlink:to="OPTT_MoneyMarketAccountMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MoneyMarketAccountMember_doc" xml:lang="en-US">Money Market Account [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_MonroeTownshipMember" xlink:to="OPTT_MonroeTownshipMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_MonroeTownshipMember_doc" xml:lang="en-US">Monroe Township [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_NavalResearchMember" xlink:label="OPTT_NavalResearchMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NavalResearchMember" xlink:to="OPTT_NavalResearchMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NavalResearchMember_doc" xml:lang="en-US">Naval Research [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_NewJerseyBoardOfPublicUtilities1Member" xlink:label="OPTT_NewJerseyBoardOfPublicUtilities1Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NewJerseyBoardOfPublicUtilities1Member" xlink:to="OPTT_NewJerseyBoardOfPublicUtilities1Member_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NewJerseyBoardOfPublicUtilities1Member_doc" xml:lang="en-US">New Jersey Board of Public Utilities 1 [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NonVestedRestrictedStockMember" xlink:to="OPTT_NonVestedRestrictedStockMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NonVestedRestrictedStockMember_doc" xml:lang="en-US">Non-vested Restricted Stock [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OPTAMember" xlink:label="OPTT_OPTAMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OPTAMember" xlink:to="OPTT_OPTAMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OPTAMember_doc" xml:lang="en-US">OPTA [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OfferingAgreementMember" xlink:label="OPTT_OfferingAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OfferingAgreementMember" xlink:to="OPTT_OfferingAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OfferingAgreementMember_doc" xml:lang="en-US">Offering Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OfficeFurnitureAndEquipmentMember" xlink:to="OPTT_OfficeFurnitureAndEquipmentMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OfficeFurnitureAndEquipmentMember_doc" xml:lang="en-US">Represents office furniture and equipment.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OfficeFurnitureAndFixturesMember" xlink:label="OPTT_OfficeFurnitureAndFixturesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OfficeFurnitureAndFixturesMember" xlink:to="OPTT_OfficeFurnitureAndFixturesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OfficeFurnitureAndFixturesMember_doc" xml:lang="en-US">Office Furniture &amp;amp;amp; Fixtures [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OfficeOfNavalResearchMember" xlink:label="OPTT_OfficeOfNavalResearchMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OfficeOfNavalResearchMember" xlink:to="OPTT_OfficeOfNavalResearchMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OfficeOfNavalResearchMember_doc" xml:lang="en-US">Office of Naval Research [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OneAgreementMember" xlink:label="OPTT_OneAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OneAgreementMember" xlink:to="OPTT_OneAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OneAgreementMember_doc" xml:lang="en-US">One Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OtherAgreementMember" xlink:label="OPTT_OtherAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OtherAgreementMember" xlink:to="OPTT_OtherAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OtherAgreementMember_doc" xml:lang="en-US">Other Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OtherMember" xlink:to="OPTT_OtherMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OtherMember_doc" xml:lang="en-US">Other [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_OvernightRepurchaseAccountMember" xlink:label="OPTT_OvernightRepurchaseAccountMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OvernightRepurchaseAccountMember" xlink:to="OPTT_OvernightRepurchaseAccountMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OvernightRepurchaseAccountMember_doc" xml:lang="en-US">Overnight Repurchase Account [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PBThreePowerBuoyMember" xlink:label="OPTT_PBThreePowerBuoyMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PBThreePowerBuoyMember" xlink:to="OPTT_PBThreePowerBuoyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PBThreePowerBuoyMember_doc" xml:lang="en-US">PB 3 PowerBuoy [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PerformancceBasedStockOptionsMember" xlink:to="OPTT_PerformancceBasedStockOptionsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PerformancceBasedStockOptionsMember_doc" xml:lang="en-US">Performance-based Stock Options [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PerformanceBasedVestingMember" xlink:label="OPTT_PerformanceBasedVestingMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PerformanceBasedVestingMember" xlink:to="OPTT_PerformanceBasedVestingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PerformanceBasedVestingMember_doc" xml:lang="en-US">Performance-based Vesting [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-20210131.xsd#OPTT_PlacementAgentFeesMember" xlink:label="OPTT_PlacementAgentFeesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PlacementAgentFeesMember" xlink:to="OPTT_PlacementAgentFeesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PlacementAgentFeesMember_doc" xml:lang="en-US">Placement Agent Fees [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PlacementAgentsMember" xlink:label="OPTT_PlacementAgentsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PlacementAgentsMember" xlink:to="OPTT_PlacementAgentsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PlacementAgentsMember_doc" xml:lang="en-US">Placement Agents [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_PocketAndLegalExpensesMember" xlink:label="OPTT_PocketAndLegalExpensesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PocketAndLegalExpensesMember" xlink:to="OPTT_PocketAndLegalExpensesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PocketAndLegalExpensesMember_doc" xml:lang="en-US">Pocket and Legal Expenses [Member]</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_PremierOilUKLimitedMember" xlink:to="OPTT_PremierOilUKLimitedMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PremierOilUKLimitedMember_doc" xml:lang="en-US">Premier Oil UK Limited [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses" xlink:to="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PrepaidFinancingCostsReportedInAccruedExpenses_doc" xml:lang="en-US">Prepaid financing costs reported in accrued expenses.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ProductDevelopmentMember" xlink:label="OPTT_ProductDevelopmentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProductDevelopmentMember" xlink:to="OPTT_ProductDevelopmentMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ProductDevelopmentMember_doc" xml:lang="en-US">Primary financial statement caption encompassing product development.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_RestrictedCashMember" xlink:label="OPTT_RestrictedCashMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_RestrictedCashMember" xlink:to="OPTT_RestrictedCashMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_RestrictedCashMember_doc" xml:lang="en-US">Restricted Cash [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ReverseStockSplitMember" xlink:label="OPTT_ReverseStockSplitMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ReverseStockSplitMember" xlink:to="OPTT_ReverseStockSplitMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ReverseStockSplitMember_doc" xml:lang="en-US">Reverse Stock Split [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">Cash on deposit at Santander Bank which serves as security for letter of credit.</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_SecondAmendedPurchaseAgreementMember" xlink:to="OPTT_SecondAmendedPurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SecondAmendedPurchaseAgreementMember_doc" xml:lang="en-US">Second Amended Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SecuritiesPurchaseAgreementMember" xlink:to="OPTT_SecuritiesPurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SecuritiesPurchaseAgreementMember_doc" xml:lang="en-US">Securities Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_SeptemberEleventhTwoThousandandEighteenMember" xlink:label="OPTT_SeptemberEleventhTwoThousandandEighteenMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SeptemberEleventhTwoThousandandEighteenMember" xlink:to="OPTT_SeptemberEleventhTwoThousandandEighteenMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SeptemberEleventhTwoThousandandEighteenMember_doc" xml:lang="en-US">September 11th, 2018 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_ServiceBasedVestingMember" xlink:label="OPTT_ServiceBasedVestingMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ServiceBasedVestingMember" xlink:to="OPTT_ServiceBasedVestingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ServiceBasedVestingMember_doc" xml:lang="en-US">Service-based Vesting [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_SettlementAgreementAndReleaseMember" xlink:label="OPTT_SettlementAgreementAndReleaseMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SettlementAgreementAndReleaseMember" xlink:to="OPTT_SettlementAgreementAndReleaseMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SettlementAgreementAndReleaseMember_doc" xml:lang="en-US">Settlement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_SternLawsuitMember" xlink:label="OPTT_SternLawsuitMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SternLawsuitMember" xlink:to="OPTT_SternLawsuitMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SternLawsuitMember_doc" xml:lang="en-US">Stern Lawsuit [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StipulationMember" xlink:label="OPTT_StipulationMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StipulationMember" xlink:to="OPTT_StipulationMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StipulationMember_doc" xml:lang="en-US">Stipulation [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIncentivePlanMember" xlink:to="OPTT_StockIncentivePlanMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIncentivePlanMember_doc" xml:lang="en-US">Stock Incentive Plan [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockIncentivePlanTwoThousandAndFifteenMember" xlink:label="OPTT_StockIncentivePlanTwoThousandAndFifteenMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIncentivePlanTwoThousandAndFifteenMember" xlink:to="OPTT_StockIncentivePlanTwoThousandAndFifteenMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIncentivePlanTwoThousandAndFifteenMember_doc" xml:lang="en-US">Stock Incentive Plan 2015 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_StockIncentivePlanTwoThousandAndSixMember" xlink:label="OPTT_StockIncentivePlanTwoThousandAndSixMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIncentivePlanTwoThousandAndSixMember" xlink:to="OPTT_StockIncentivePlanTwoThousandAndSixMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIncentivePlanTwoThousandAndSixMember_doc" xml:lang="en-US">Stock Incentive Plan 2006 [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne" xlink:to="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIssuedDuringPeriodSharesNewIssuesOne_doc" xml:lang="en-US">Issuance of common stock at the market offering, net of issuance costs, shares.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockIssuedDuringPeriodValueNewIssuesOne" xlink:to="OPTT_StockIssuedDuringPeriodValueNewIssuesOne_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIssuedDuringPeriodValueNewIssuesOne_doc" xml:lang="en-US">Issuance of common stock at the market offering, net of issuance costs.</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:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_TideRunnerMarineIncMember" xlink:label="OPTT_TideRunnerMarineIncMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TideRunnerMarineIncMember" xlink:to="OPTT_TideRunnerMarineIncMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_TideRunnerMarineIncMember_doc" xml:lang="en-US">Tide Runner Marine, Inc. [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_TwoExecutivesMember" xlink:to="OPTT_TwoExecutivesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_TwoExecutivesMember_doc" xml:lang="en-US">Two Executives [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_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_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_TwoThousandNinteenATMFacilityMember" xlink:to="OPTT_TwoThousandNinteenATMFacilityMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_TwoThousandNinteenATMFacilityMember_doc" xml:lang="en-US">2019 ATM Facility [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_USDepartmentOfDefenseOfficeOfNavalResearchMember" xlink:label="OPTT_USDepartmentOfDefenseOfficeOfNavalResearchMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_USDepartmentOfDefenseOfficeOfNavalResearchMember" xlink:to="OPTT_USDepartmentOfDefenseOfficeOfNavalResearchMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_USDepartmentOfDefenseOfficeOfNavalResearchMember_doc" xml:lang="en-US">Related to the customer U.S. Department of Defense Office of Naval Research.</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_UndesignatedPreferredSharesMember" xlink:label="OPTT_UndesignatedPreferredSharesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_UndesignatedPreferredSharesMember" xlink:to="OPTT_UndesignatedPreferredSharesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_UndesignatedPreferredSharesMember_doc" xml:lang="en-US">Undesignated Preferred Shares [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_UndesignatedPreferredStockMember" xlink:label="OPTT_UndesignatedPreferredStockMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_UndesignatedPreferredStockMember" xlink:to="OPTT_UndesignatedPreferredStockMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_UndesignatedPreferredStockMember_doc" xml:lang="en-US">Undesignated Preferred Stock [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_UnitedStatesNavyMember" xlink:label="OPTT_UnitedStatesNavyMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_UnitedStatesNavyMember" xlink:to="OPTT_UnitedStatesNavyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_UnitedStatesNavyMember_doc" xml:lang="en-US">US Navy [Member]</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">Warrants [Text Block]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_WarrantLiabilityMember" xlink:label="OPTT_WarrantLiabilityMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_WarrantLiabilityMember" xlink:to="OPTT_WarrantLiabilityMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_WarrantLiabilityMember_doc" xml:lang="en-US">Warrant Liability[Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_WittichBrosMarineIncMember" xlink:label="OPTT_WittichBrosMarineIncMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_WittichBrosMarineIncMember" xlink:to="OPTT_WittichBrosMarineIncMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_WittichBrosMarineIncMember_doc" xml:lang="en-US">Wittich [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts" xlink:to="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts_doc" xml:lang="en-US">Exercise of prefunded warrants, net of issuance costs.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares" xlink:to="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares_doc" xml:lang="en-US">Exercise of prefunded warrants, net of issuance costs shares.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProceedsFromRepaymentsOfPrefundedWarrants" xlink:to="OPTT_ProceedsFromRepaymentsOfPrefundedWarrants_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ProceedsFromRepaymentsOfPrefundedWarrants_doc" xml:lang="en-US">Proceeds (costs) associated with exercise of pre-funded warrants.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeeMember" xlink:to="OPTT_EmployeeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EmployeeMember_doc" xml:lang="en-US">Employee [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaycheckProtectionProgramLoanCurrent" xlink:to="OPTT_PaycheckProtectionProgramLoanCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PaycheckProtectionProgramLoanCurrent_doc" xml:lang="en-US">Paycheck protection program loan- current.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaycheckProtectionProgramLoanNonCurrent" xlink:to="OPTT_PaycheckProtectionProgramLoanNonCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PaycheckProtectionProgramLoanNonCurrent_doc" xml:lang="en-US">Paycheck protection program loan less current portion.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProceedsFromPaycheckProtectionProgramLoan" xlink:to="OPTT_ProceedsFromPaycheckProtectionProgramLoan_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ProceedsFromPaycheckProtectionProgramLoan_doc" xml:lang="en-US">Proceeds from paycheck protection program loan.</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:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_USNavyMember" xlink:label="OPTT_USNavyMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_USNavyMember" xlink:to="OPTT_USNavyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_USNavyMember_doc" xml:lang="en-US">U.S. Navy [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EngineeringAndProductDevelopmentMember" xlink:to="OPTT_EngineeringAndProductDevelopmentMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EngineeringAndProductDevelopmentMember_doc" xml:lang="en-US">Engineering and Product Development [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SixMonthsAfterDisbursementDateMember" xlink:to="OPTT_SixMonthsAfterDisbursementDateMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SixMonthsAfterDisbursementDateMember_doc" xml:lang="en-US">6 Months After Disbursement Date [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_SubjectToServiceBasedVestingRequirementsMember" xlink:to="OPTT_SubjectToServiceBasedVestingRequirementsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_SubjectToServiceBasedVestingRequirementsMember_doc" xml:lang="en-US">Subject to Service- Based Vesting Requirements [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_RecordedAdditionalPenaltyMember" xlink:to="OPTT_RecordedAdditionalPenaltyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_RecordedAdditionalPenaltyMember_doc" xml:lang="en-US">Recorded Additional Penalty [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_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee" xlink:to="OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee_doc" xml:lang="en-US">Common stock issued for payment of commitment fee.</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.</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">Two Thousand Twenty ATM Facility [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_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable" xlink:to="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable_doc" xml:lang="en-US">Acquisition of property, plant and equipment through accounts payable.</link:label>
      <link: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_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram_doc" xml:lang="en-US">Outstanding receivable for sale of shares through AGP at the Market program.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises_doc" xml:lang="en-US">Outstanding receivable for sale of shares from warrant exercises.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises" xlink:to="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises_doc" xml:lang="en-US">Outstanding receivable for sale of shares from stock option exercises.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ExerciseOfCommonWarrantsNetOfCosts" xlink:to="OPTT_ExerciseOfCommonWarrantsNetOfCosts_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCosts_doc" xml:lang="en-US">Exercise of common warrants, net of costs.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares" xlink:to="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ExerciseOfCommonWarrantsNetOfCostsShares_doc" xml:lang="en-US">Exercise of common warrants, net of costs, shares.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NoncashFinancingItemsAbstract" xlink:to="OPTT_NoncashFinancingItemsAbstract_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NoncashFinancingItemsAbstract_doc" xml:lang="en-US">Supplemental disclosure of noncash financing activities.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_UnitPurchaseAgreementMember" xlink:to="OPTT_UnitPurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_UnitPurchaseAgreementMember_doc" xml:lang="en-US">Unit Purchase Agreement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ThreedentTechnologyLLCMember" xlink:to="OPTT_ThreedentTechnologyLLCMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ThreedentTechnologyLLCMember_doc" xml:lang="en-US">3dent Technology, LLC.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PotentialValue" xlink:to="OPTT_PotentialValue_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PotentialValue_doc" xml:lang="en-US">Potential value.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_FormerOwnersMember" xlink:to="OPTT_FormerOwnersMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_FormerOwnersMember_doc" xml:lang="en-US">Former Owners.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ProceedsFromInitialPublicOffering" xlink:to="OPTT_ProceedsFromInitialPublicOffering_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ProceedsFromInitialPublicOffering_doc" xml:lang="en-US">The cash inflow associated with the amount received from entity's first offering of stock to the public.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PaymentOfSalesCommission" xlink:to="OPTT_PaymentOfSalesCommission_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PaymentOfSalesCommission_doc" xml:lang="en-US">Payment of sales commission.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_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_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_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_ContractReceivablesDueAfterNextRollingTwelveMonths" xlink:to="OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths_doc" xml:lang="en-US">Amount billed to customers under long-term contracts or programs to be collected after the next rolling twelve months following the latest balance sheet. Excludes amounts due that have been withheld because of retainage provisions in a contract. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ACETMember" xlink:to="OPTT_ACETMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ACETMember_doc" xml:lang="en-US">ACET [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_PrepaidOfferingCosts" xlink:to="OPTT_PrepaidOfferingCosts_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PrepaidOfferingCosts_doc" xml:lang="en-US">Amount of asset related to consideration paid in advance for offering costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights" xlink:to="OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights_doc" xml:lang="en-US">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.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NumberOfExercisedWarrants" xlink:to="OPTT_NumberOfExercisedWarrants_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NumberOfExercisedWarrants_doc" xml:lang="en-US">Number of exercised warrants.</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_PayrollProtectionFlexibilityDescription" xlink:to="OPTT_PayrollProtectionFlexibilityDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_PayrollProtectionFlexibilityDescription_doc" xml:lang="en-US">Payroll protection flexibility, description.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_InsuranceFundingAmount" xlink:to="OPTT_InsuranceFundingAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_InsuranceFundingAmount_doc" xml:lang="en-US">Insurance funding amount.</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:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EmployeeStockOptionTwoMember" xlink:label="OPTT_EmployeeStockOptionTwoMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeeStockOptionTwoMember" xlink:to="OPTT_EmployeeStockOptionTwoMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EmployeeStockOptionTwoMember_doc" xml:lang="en-US">Employee Stock Option Two [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="optt-20210131.xsd#OPTT_EmployeeStockOptionThreeMember" xlink:label="OPTT_EmployeeStockOptionThreeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_EmployeeStockOptionThreeMember" xlink:to="OPTT_EmployeeStockOptionThreeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_EmployeeStockOptionThreeMember_doc" xml:lang="en-US">Employee Stock Option Three [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockOptionsVestingPeriodDescription" xlink:to="OPTT_StockOptionsVestingPeriodDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockOptionsVestingPeriodDescription_doc" xml:lang="en-US">Stock options vesting period, description.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks" xlink:to="OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks_doc" xml:lang="en-US">Unrecognized compensation cost remaining related to unvested restricted stock.</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 for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_NasdaqDelistingNotificationDescription" xlink:to="OPTT_NasdaqDelistingNotificationDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_NasdaqDelistingNotificationDescription_doc" xml:lang="en-US">Nasdaq delisting notification description.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockSubscriptionReceivable" xlink:to="OPTT_StockSubscriptionReceivable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockSubscriptionReceivable_doc" xml:lang="en-US">Stock subscription receivable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockSubscriptionReceivableMember" xlink:to="OPTT_StockSubscriptionReceivableMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockSubscriptionReceivableMember_doc" xml:lang="en-US">Stock Subscription Receivable [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock" xlink:to="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionTableTextBlock_doc" xml:lang="en-US">Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.</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_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_StockPurchaseAgreementOneMember" xlink:to="OPTT_StockPurchaseAgreementOneMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="OPTT_StockPurchaseAgreementOneMember_doc" xml:lang="en-US">Stock Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="currency_EUR" xlink:to="currency_EUR_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="currency_EUR_2_lbl" xml:lang="en-US">Euro Member Countries, Euro</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OPTT_StockPurchaseAgreementOneMember" xlink:to="OPTT_StockPurchaseAgreementOneMember_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OPTT_StockPurchaseAgreementOneMember_3_lbl" xml:lang="en-US">StockPurchaseAgreementOneMember</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PerformanceSharesMember" xlink:to="us-gaap_PerformanceSharesMember_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PerformanceSharesMember_2_lbl" xml:lang="en-US">Performance Shares [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrent_2_lbl" xml:lang="en-US">Assets, Current</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_2_lbl" xlink:type="arc" />
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<TYPE>EX-101.PRE
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801031468360">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Document and Entity Information - shares<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Mar. 03, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DocumentAndEntityInformationAbstract', window );"><strong>Document And Entity Information</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">Ocean Power Technologies, Inc.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001378140<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">10-Q<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Jan. 31,  2021<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="top.Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
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<td class="text">&#160;<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CurrentFiscalYearEndDate', window );">Current Fiscal Year End Date</a></td>
<td class="text">--04-30<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCurrentReportingStatus', window );">Entity's Reporting Status 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="top.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="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.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="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntitySmallBusiness', window );">Entity Small Business Flag</a></td>
<td class="text">true<span></span>
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<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_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="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.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>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCommonStockSharesOutstanding', window );">Entity Common Stock, Shares Outstanding</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">50,985,760<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentFiscalPeriodFocus', window );">Document Fiscal Period Focus</a></td>
<td class="text">Q3<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentFiscalYearFocus', window );">Document Fiscal Year Focus</a></td>
<td class="text">2021<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_OPTT_DocumentAndEntityInformationAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_DocumentAndEntityInformationAbstract</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td>na</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ 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>
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<td>xbrli:booleanItemType</td>
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<td>na</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_dei_CurrentFiscalYearEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.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="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CurrentFiscalYearEndDate</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<td>na</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_dei_DocumentFiscalPeriodFocus">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentFiscalPeriodFocus</td>
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<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>This is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentFiscalYearFocus</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
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<td><strong> Balance Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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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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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCommonStockSharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCommonStockSharesOutstanding</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCurrentReportingStatus">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCurrentReportingStatus</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<td><strong> Data Type:</strong></td>
<td>dei:yesNoItemType</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>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFilerCategory">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFilerCategory</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:filerCategoryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityInteractiveDataCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation S-T<br> -Number 232<br> -Section 405<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityInteractiveDataCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:yesNoItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityShellCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityShellCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntitySmallBusiness">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicates that the company is a Smaller Reporting Company (SRC).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntitySmallBusiness</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>13
<FILENAME>R2.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801027430440">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Balance Sheets - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetsCurrentAbstract', window );"><strong>Current assets:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 79,801<span></span>
</td>
<td class="nump">$ 10,002<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCashCurrent', window );">Restricted cash, short-term</a></td>
<td class="nump">384<span></span>
</td>
<td class="nump">707<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsReceivableNetCurrent', window );">Accounts receivable</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">105<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNetCurrent', window );">Contract assets</a></td>
<td class="nump">63<span></span>
</td>
<td class="nump">251<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAssetsCurrent', window );">Other current assets</a></td>
<td class="nump">1,001<span></span>
</td>
<td class="nump">588<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AssetsCurrent', window );">Total current assets</a></td>
<td class="nump">81,249<span></span>
</td>
<td class="nump">11,653<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentNet', window );">Property and equipment, net</a></td>
<td class="nump">417<span></span>
</td>
<td class="nump">499<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAsset', window );">Right-of-use asset, net</a></td>
<td class="nump">1,005<span></span>
</td>
<td class="nump">1,165<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCashNoncurrent', window );">Restricted cash, long-term</a></td>
<td class="nump">222<span></span>
</td>
<td class="nump">221<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Assets', window );">Total assets</a></td>
<td class="nump">82,893<span></span>
</td>
<td class="nump">13,538<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_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="top.Show.showAR( this, 'defref_us-gaap_LoansPayableCurrent', window );">Loan payable</a></td>
<td class="nump">175<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsPayableCurrent', window );">Accounts payable</a></td>
<td class="nump">74<span></span>
</td>
<td class="nump">220<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedLiabilitiesCurrent', window );">Accrued expenses</a></td>
<td class="nump">2,340<span></span>
</td>
<td class="nump">1,353<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiabilityCurrent', window );">Contract liabilities, current portion</a></td>
<td class="nump">75<span></span>
</td>
<td class="nump">100<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityCurrent', window );">Right-of-use liability, current portion</a></td>
<td class="nump">252<span></span>
</td>
<td class="nump">229<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DerivativeLiabilitiesCurrent', window );">Warrant liabilities</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PaycheckProtectionProgramLoanCurrent', window );">Paycheck protection program loan- current</a></td>
<td class="nump">396<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LiabilitiesCurrent', window );">Total current liabilities</a></td>
<td class="nump">3,312<span></span>
</td>
<td class="nump">1,902<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PaycheckProtectionProgramLoanNonCurrent', window );">Paycheck protection program loan, less current portion</a></td>
<td class="nump">495<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityNoncurrent', window );">Right-of-use liability, less current portion</a></td>
<td class="nump">887<span></span>
</td>
<td class="nump">1,078<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CapitalLeaseObligationsCurrent', window );">Contract liabilities, less current portion</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">65<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Liabilities', window );">Total liabilities</a></td>
<td class="nump">4,694<span></span>
</td>
<td class="nump">3,045<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingencies', window );">Commitments and contingencies (Note 16)</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquityAbstract', window );"><strong>Stockholders' 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="top.Show.showAR( this, 'defref_us-gaap_PreferredStockValue', window );">Preferred stock, $0.001 par value; authorized 5,000,000 shares, none issued or outstanding</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockValue', window );">Common stock, $0.001 par value; authorized 100,000,000 shares, issued 50,589,809 and 12,939,420 shares, respectively</a></td>
<td class="nump">51<span></span>
</td>
<td class="nump">13<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockValue', window );">Treasury stock, at cost; 21,040 and 4,251 shares, respectively</a></td>
<td class="num">(338)<span></span>
</td>
<td class="num">(302)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdditionalPaidInCapital', window );">Additional paid-in capital</a></td>
<td class="nump">310,342<span></span>
</td>
<td class="nump">231,101<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockSubscriptionReceivable', window );">Stock subscription receivable</a></td>
<td class="num">(1,983)<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RetainedEarningsAccumulatedDeficit', window );">Accumulated deficit</a></td>
<td class="num">(229,696)<span></span>
</td>
<td class="num">(220,136)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax', window );">Accumulated other comprehensive loss</a></td>
<td class="num">(177)<span></span>
</td>
<td class="num">(183)<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Total stockholders' equity</a></td>
<td class="nump">78,199<span></span>
</td>
<td class="nump">10,493<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LiabilitiesAndStockholdersEquity', window );">Total liabilities and stockholders' equity</a></td>
<td class="nump">$ 82,893<span></span>
</td>
<td class="nump">$ 13,538<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PaycheckProtectionProgramLoanCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Paycheck protection program loan- current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PaycheckProtectionProgramLoanCurrent</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_PaycheckProtectionProgramLoanNonCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Paycheck protection program loan less current portion.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PaycheckProtectionProgramLoanNonCurrent</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_StockSubscriptionReceivable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Stock subscription receivable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockSubscriptionReceivable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountsPayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsPayableCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountsReceivableNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=121593590&amp;loc=d3e4428-111522<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=121593590&amp;loc=d3e4531-111522<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsReceivableNetCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedLiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(4))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 11<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=d3e637-108580<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14A<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669686-108580<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (h)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=121370832&amp;loc=SL117420844-207641<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=121370832&amp;loc=SL117420844-207641<br><br>Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=d3e681-108580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdditionalPaidInCapital">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 65<br> -Paragraph 15<br> -Subparagraph (g)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=121322162&amp;loc=SL121327923-165333<br><br>Reference 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 http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdditionalPaidInCapital</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Assets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(11))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&amp;loc=d3e14064-108612<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (bb)<br> -URI http://asc.fasb.org/extlink&amp;oid=121559654&amp;loc=d3e5710-111685<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=116870748&amp;loc=SL6758485-165988<br><br>Reference 6: 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 (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8933-108599<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8736-108599<br><br>Reference 8: 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)(12))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 10: 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 (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8906-108599<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Assets</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6801-107765<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&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 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=116870748&amp;loc=SL6758485-165988<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (bb)<br> -URI http://asc.fasb.org/extlink&amp;oid=121559654&amp;loc=d3e5710-111685<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 210.5-02.9)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AssetsCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AssetsCurrentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AssetsCurrentAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></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>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CapitalLeaseObligationsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of capital lease obligation due within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 840<br> -SubTopic 30<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=121569800&amp;loc=d3e45023-112735<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 840<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121616839&amp;loc=d3e45280-112737<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef<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))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CapitalLeaseObligationsCurrent</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>
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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_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommitmentsAndContingencies">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.25)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03.(a),19)<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03.17)<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommitmentsAndContingencies</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerAssetNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130531-203044<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130533-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121604090&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerAssetNetCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130531-203044<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130532-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121604090&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerLiabilityCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DerivativeLiabilitiesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 20<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=51824906&amp;loc=SL20225862-175312<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DerivativeLiabilitiesCurrent</td>
</tr>
<tr>
<td style="padding-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_Liabilities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=116870748&amp;loc=SL6758485-165988<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&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 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (bb)<br> -URI http://asc.fasb.org/extlink&amp;oid=121559654&amp;loc=d3e5710-111685<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 210.5-02.19-26)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121559654&amp;loc=d3e5710-111685<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 7: http://www.xbrl.org/2003/role/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 http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8906-108599<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 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(23))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<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)(25))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 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(32))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&amp;loc=d3e14064-108612<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (bb)<br> -URI http://asc.fasb.org/extlink&amp;oid=121559654&amp;loc=d3e5710-111685<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&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 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=116870748&amp;loc=SL6758485-165988<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(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<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 210.5-02.21)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121559654&amp;loc=d3e5710-111685<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><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>
</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_LiabilitiesCurrentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LiabilitiesCurrentAbstract</td>
</tr>
<tr>
<td style="padding-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_LoansPayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of portion of long-term loans payable due within one year or the operating cycle if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LoansPayableCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121603541&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiabilityNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121603541&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseRightOfUseAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's right to use underlying asset under operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121603541&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseRightOfUseAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherAssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of current assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.8)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherAssetsCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><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">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(14))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(8))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(13))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentNet</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>
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<tr>
<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
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</div></td></tr>
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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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121583591&amp;loc=SL98516268-108586<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedCashCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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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_RestrictedCashNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6812-107765<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(17))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121583591&amp;loc=SL98516268-108586<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 210<br> -Section 45<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120413173&amp;loc=SL116631458-115580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedCashNoncurrent</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RetainedEarningsAccumulatedDeficit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cumulative amount of the reporting entity's undistributed earnings or deficit.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 65<br> -Paragraph 15<br> -Subparagraph (g)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=121322162&amp;loc=SL121327923-165333<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(4))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 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 http://asc.fasb.org/extlink&amp;oid=121370832&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 http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=121370832&amp;loc=SL117420844-207641<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RetainedEarningsAccumulatedDeficit</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockholdersEquity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SAB Topic 4.E)<br> -URI http://asc.fasb.org/extlink&amp;oid=27010918&amp;loc=d3e74512-122707<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(31))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&amp;loc=d3e14064-108612<br><br>Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockholdersEquity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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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_StockholdersEquityAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockholdersEquityAbstract</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 50<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=6405834&amp;loc=d3e23315-112656<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29,30)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockValue</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
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<td><strong> Balance Type:</strong></td>
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<td>instant</td>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801031470344">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Balance Sheets (Parenthetical) - $ / shares<br></strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementOfFinancialPositionAbstract', window );"><strong>Statement of Financial Position [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockParOrStatedValuePerShare', window );">Preferred stock, par value</a></td>
<td class="nump">$ 0.001<span></span>
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<td class="nump">$ 0.001<span></span>
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<td class="nump">5,000,000<span></span>
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<td class="nump">5,000,000<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesIssued', window );">Preferred stock, shares issued</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesOutstanding', window );">Preferred stock, shares 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="top.Show.showAR( this, 'defref_us-gaap_CommonStockParOrStatedValuePerShare', window );">Common stock, par value</a></td>
<td class="nump">$ 0.001<span></span>
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<td class="nump">$ 0.001<span></span>
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<tr class="re">
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<td class="nump">100,000,000<span></span>
</td>
<td class="nump">100,000,000<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockSharesIssued', window );">Common stock, shares issued</a></td>
<td class="nump">50,589,809<span></span>
</td>
<td class="nump">12,939,420<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockShares', window );">Treasury stock, shares</a></td>
<td class="nump">21,040<span></span>
</td>
<td class="nump">4,251<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockParOrStatedValuePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face amount or stated value per share of common stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockParOrStatedValuePerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum number of common shares permitted to be issued by an entity's charter and bylaws.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockSharesIssued</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockParOrStatedValuePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><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>num:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesIssued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesIssued</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementOfFinancialPositionAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementOfFinancialPositionAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29,30)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801024968280">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Consolidated Statements of Operations (Unaudited) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementAbstract', window );"><strong>Income Statement [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="nump">$ 317<span></span>
</td>
<td class="nump">$ 725<span></span>
</td>
<td class="nump">$ 604<span></span>
</td>
<td class="nump">$ 1,131<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CostOfRevenue', window );">Cost of revenues</a></td>
<td class="nump">698<span></span>
</td>
<td class="nump">681<span></span>
</td>
<td class="nump">1,248<span></span>
</td>
<td class="nump">1,335<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GrossProfit', window );">Gross profit/(loss)</a></td>
<td class="num">(381)<span></span>
</td>
<td class="nump">44<span></span>
</td>
<td class="num">(644)<span></span>
</td>
<td class="num">(204)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingExpensesAbstract', window );"><strong>Operating expenses:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost', window );">Engineering and product development costs</a></td>
<td class="nump">1,019<span></span>
</td>
<td class="nump">896<span></span>
</td>
<td class="nump">3,334<span></span>
</td>
<td class="nump">3,403<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SellingGeneralAndAdministrativeExpense', window );">Selling, general and administrative costs</a></td>
<td class="nump">1,763<span></span>
</td>
<td class="nump">2,093<span></span>
</td>
<td class="nump">5,591<span></span>
</td>
<td class="nump">5,629<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingExpenses', window );">Total operating expenses</a></td>
<td class="nump">2,782<span></span>
</td>
<td class="nump">2,989<span></span>
</td>
<td class="nump">8,925<span></span>
</td>
<td class="nump">9,032<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingIncomeLoss', window );">Operating loss</a></td>
<td class="num">(3,163)<span></span>
</td>
<td class="num">(2,945)<span></span>
</td>
<td class="num">(9,569)<span></span>
</td>
<td class="num">(9,236)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueAdjustmentOfWarrants', window );">Gain due to the change in fair value of warrant liabilities</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">6<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InterestIncomeExpenseNet', window );">Interest income, net</a></td>
<td class="nump">25<span></span>
</td>
<td class="nump">27<span></span>
</td>
<td class="nump">45<span></span>
</td>
<td class="nump">102<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherNonoperatingIncomeExpense', window );">Other expense, net</a></td>
<td class="num">(16)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(49)<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax', window );">Foreign exchange gain/(loss)</a></td>
<td class="nump">3<span></span>
</td>
<td class="num">(1)<span></span>
</td>
<td class="nump">13<span></span>
</td>
<td class="num">(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="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (3,151)<span></span>
</td>
<td class="num">$ (2,919)<span></span>
</td>
<td class="num">$ (9,560)<span></span>
</td>
<td class="num">$ (9,133)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EarningsPerShareBasicAndDiluted', window );">Basic and diluted net loss per share</a></td>
<td class="num">$ (0.09)<span></span>
</td>
<td class="num">$ (0.46)<span></span>
</td>
<td class="num">$ (0.41)<span></span>
</td>
<td class="num">$ (1.40)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted', window );">Weighted average shares used to compute basic and diluted net loss per share</a></td>
<td class="nump">33,715,334<span></span>
</td>
<td class="nump">6,318,162<span></span>
</td>
<td class="nump">23,160,885<span></span>
</td>
<td class="nump">6,543,500<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CostOfRevenue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate cost of goods produced and sold and services rendered during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&amp;loc=d3e14064-108612<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120395209&amp;loc=SL114868664-224227<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CostOfRevenue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EarningsPerShareBasicAndDiluted">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements.  Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period.  Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 45<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=121326447&amp;loc=d3e1337-109256<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EarningsPerShareBasicAndDiluted</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num: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_FairValueAdjustmentOfWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expense (income) related to adjustment to fair value of warrant liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&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 480<br> -SubTopic 10<br> -Section 25<br> -Paragraph 13<br> -URI http://asc.fasb.org/extlink&amp;oid=109262497&amp;loc=d3e20148-110875<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueAdjustmentOfWarrants</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=109240200&amp;loc=d3e30690-110894<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 35<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121605123&amp;loc=d3e30226-110892<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 10<br> -Section 45<br> -Paragraph 17<br> -URI http://asc.fasb.org/extlink&amp;oid=120253306&amp;loc=d3e28228-110885<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6450222&amp;loc=d3e30840-110895<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ForeignCurrencyTransactionGainLossBeforeTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GrossProfit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 31<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8924-108599<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 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8906-108599<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(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8736-108599<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&amp;loc=d3e14064-108612<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8933-108599<br><br>Reference 8: 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 210.5-03.1,2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120395209&amp;loc=SL114868664-224227<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8933-108599<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_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_IncomeStatementAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_InterestIncomeExpenseNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The net amount of operating interest income (expense).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04.10)<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InterestIncomeExpenseNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://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 (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669619-108580<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 31<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8924-108599<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 11<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=109234566&amp;loc=d3e22694-107794<br><br>Reference 4: 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingExpenses</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingExpensesAbstract</td>
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<td><strong> Data Type:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The net result for the period of deducting operating expenses from operating revenues.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<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>
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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_OtherNonoperatingIncomeExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of income (expense) related to nonoperating activities, classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.9)<br> -URI http://asc.fasb.org/extlink&amp;oid=120395209&amp;loc=SL114868664-224227<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherNonoperatingIncomeExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
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</tr>
<tr>
<td><strong> Balance Type:</strong></td>
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</tr>
<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_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The costs incurred in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 730<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6420194&amp;loc=d3e21568-108373<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
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</tr>
<tr>
<td><strong> Period Type:</strong></td>
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</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_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>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SellingGeneralAndAdministrativeExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03.4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120395209&amp;loc=SL114868664-224227<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801025332552">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract', window );"><strong>Statement of Comprehensive Income [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (3,151)<span></span>
</td>
<td class="num">$ (2,919)<span></span>
</td>
<td class="num">$ (9,560)<span></span>
</td>
<td class="num">$ (9,133)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax', window );">Foreign currency translation adjustment</a></td>
<td class="num">(2)<span></span>
</td>
<td class="num">(11)<span></span>
</td>
<td class="nump">6<span></span>
</td>
<td class="num">(12)<span></span>
</td>
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<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest', window );">Total comprehensive loss</a></td>
<td class="num">$ (3,153)<span></span>
</td>
<td class="num">$ (2,930)<span></span>
</td>
<td class="num">$ (9,554)<span></span>
</td>
<td class="num">$ (9,145)<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 55<br> -Paragraph 4K<br> -URI http://asc.fasb.org/extlink&amp;oid=120409616&amp;loc=SL4591552-111686<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1A<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669619-108580<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-04(20))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400993&amp;loc=SL114874131-224263<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 810<br> -SubTopic 10<br> -Section 45<br> -Paragraph 19<br> -URI http://asc.fasb.org/extlink&amp;oid=108774443&amp;loc=SL4569616-111683<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1B<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669625-108580<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03(22))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395209&amp;loc=SL114868664-224227<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(24))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 10A<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669646-108580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<FILENAME>R6.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801020939384">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Common Shares [Member]</div></th>
<th class="th"><div>Treasury Shares [Member]</div></th>
<th class="th"><div>Additional Paid-In Capital [Member]</div></th>
<th class="th"><div>Stock Subscription Receivable [Member]</div></th>
<th class="th"><div>Accumulated Deficit [Member]</div></th>
<th class="th"><div>Accumulated Other Comprehensive Loss [Member]</div></th>
<th class="th"><div>Total</div></th>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Apr. 30, 2019</a></td>
<td class="nump">$ 5<span></span>
</td>
<td class="num">$ (301)<span></span>
</td>
<td class="nump">$ 226,026<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">$ (209,784)<span></span>
</td>
<td class="num">$ (171)<span></span>
</td>
<td class="nump">$ 15,775<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Apr. 30, 2019</a></td>
<td class="nump">5,425,517<span></span>
</td>
<td class="num">(3,770)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(9,133)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(9,133)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Share-based compensation</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">225<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">225<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures', window );">Issuance (forfeiture) of restricted stock, net</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>
<td class="text"> <span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures', window );">Issuance (forfeiture) of restricted stock, net, shares</a></td>
<td class="nump">64,928<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts', window );">Exercise of prefunded warrants, net of issuance costs</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(16)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(15)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares', window );">Exercise of prefunded warrants, net of issuance costs shares</a></td>
<td class="nump">614,280<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueNewIssues', window );">Common stock issued for commitment fee</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">294<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">295<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues', window );">Common stock issued for commitment fee, shares</a></td>
<td class="nump">194,805<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">849<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">850<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs, shares</a></td>
<td class="nump">1,024,205<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">1,790<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">1,791<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs, shares</a></td>
<td class="nump">1,375,584<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockValueAcquiredCostMethod', window );">Acquisition of treasury stock</a></td>
<td class="text"> <span></span>
</td>
<td class="num">$ (1)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">$ (1)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockSharesAcquired', window );">Acquisition of treasury stock, shares</a></td>
<td class="text"> <span></span>
</td>
<td class="num">(481)<span></span>
</td>
<td class="text">&#160;<span></span>
</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">481<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax', window );">Other comprehensive gain/(loss)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(12)<span></span>
</td>
<td class="num">$ (12)<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Jan. 31, 2020</a></td>
<td class="nump">$ 9<span></span>
</td>
<td class="num">$ (302)<span></span>
</td>
<td class="nump">229,167<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(218,917)<span></span>
</td>
<td class="num">(184)<span></span>
</td>
<td class="nump">9,774<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Jan. 31, 2020</a></td>
<td class="nump">8,699,319<span></span>
</td>
<td class="num">(4,251)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Oct. 31, 2019</a></td>
<td class="nump">$ 7<span></span>
</td>
<td class="num">$ (302)<span></span>
</td>
<td class="nump">227,214<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(215,998)<span></span>
</td>
<td class="num">(173)<span></span>
</td>
<td class="nump">10,749<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Oct. 31, 2019</a></td>
<td class="nump">6,489,668<span></span>
</td>
<td class="num">(4,251)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(2,919)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(2,919)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Share-based compensation</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">56<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">56<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures', window );">Issuance (forfeiture) of restricted stock, net</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>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures', window );">Issuance (forfeiture) of restricted stock, net, shares</a></td>
<td class="nump">65,060<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts', window );">Exercise of prefunded warrants, net of issuance costs</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">2<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">2<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares', window );">Exercise of prefunded warrants, net of issuance costs shares</a></td>
<td class="nump">264,280<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">849<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">850<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs, shares</a></td>
<td class="nump">1,024,205<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">1,045<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 1,046<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs, shares</a></td>
<td class="nump">856,106<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockSharesAcquired', window );">Acquisition of treasury stock, shares</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax', window );">Other comprehensive gain/(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="num">(11)<span></span>
</td>
<td class="num">$ (11)<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Jan. 31, 2020</a></td>
<td class="nump">$ 9<span></span>
</td>
<td class="num">$ (302)<span></span>
</td>
<td class="nump">229,167<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(218,917)<span></span>
</td>
<td class="num">(184)<span></span>
</td>
<td class="nump">9,774<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Jan. 31, 2020</a></td>
<td class="nump">8,699,319<span></span>
</td>
<td class="num">(4,251)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Apr. 30, 2020</a></td>
<td class="nump">$ 13<span></span>
</td>
<td class="num">$ (302)<span></span>
</td>
<td class="nump">231,101<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(220,136)<span></span>
</td>
<td class="num">(183)<span></span>
</td>
<td class="nump">10,493<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Apr. 30, 2020</a></td>
<td class="nump">12,939,420<span></span>
</td>
<td class="num">(4,251)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(9,560)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(9,560)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Share-based compensation</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">338<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">338<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised', window );">Proceeds from stock options exercises</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">184<span></span>
</td>
<td class="num">(144)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">40<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Proceeds from stock options exercises, shares</a></td>
<td class="nump">175,500<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="top.Show.showAR( this, 'defref_OPTT_ExerciseOfCommonWarrantsNetOfCosts', window );">Exercise of common warrants, net of costs</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">2,607<span></span>
</td>
<td class="num">(1,839)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">769<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfCommonWarrantsNetOfCostsShares', window );">Exercise of common warrants, net of costs, shares</a></td>
<td class="nump">677,500<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="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs</a></td>
<td class="nump">$ 7<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">9,976<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">9,983<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs, shares</a></td>
<td class="nump">7,275,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs</a></td>
<td class="nump">$ 30<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">66,136<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">66,166<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs, shares</a></td>
<td class="nump">29,522,389<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockValueAcquiredCostMethod', window );">Acquisition of treasury stock</a></td>
<td class="text"> <span></span>
</td>
<td class="num">$ (36)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">$ (36)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockSharesAcquired', window );">Acquisition of treasury stock, shares</a></td>
<td class="text"> <span></span>
</td>
<td class="num">(16,789)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">16,789<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax', window );">Other comprehensive gain/(loss)</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">6<span></span>
</td>
<td class="nump">$ 6<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Jan. 31, 2021</a></td>
<td class="nump">$ 51<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">310,342<span></span>
</td>
<td class="num">(1,983)<span></span>
</td>
<td class="num">(229,696)<span></span>
</td>
<td class="num">(177)<span></span>
</td>
<td class="nump">78,199<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Jan. 31, 2021</a></td>
<td class="nump">50,589,809<span></span>
</td>
<td class="num">(21,040)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Oct. 31, 2020</a></td>
<td class="nump">$ 24<span></span>
</td>
<td class="num">$ (302)<span></span>
</td>
<td class="nump">240,782<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(226,545)<span></span>
</td>
<td class="num">(175)<span></span>
</td>
<td class="nump">13,784<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Oct. 31, 2020</a></td>
<td class="nump">24,153,554<span></span>
</td>
<td class="num">(4,251)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(3,151)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(3,151)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue', window );">Share-based compensation</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">115<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">115<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised', window );">Proceeds from stock options exercises</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">184<span></span>
</td>
<td class="num">(144)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">40<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Proceeds from stock options exercises, shares</a></td>
<td class="nump">175,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfCommonWarrantsNetOfCosts', window );">Exercise of common warrants, net of costs</a></td>
<td class="nump">$ 1<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">2,607<span></span>
</td>
<td class="num">(1,839)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">769<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ExerciseOfCommonWarrantsNetOfCostsShares', window );">Exercise of common warrants, net of costs, shares</a></td>
<td class="nump">677,500<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs</a></td>
<td class="nump">$ 2<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">6,740<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">6,742<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesNewIssuesOne', window );">Issuance of common stock- Aspire financing, net of issuance costs, shares</a></td>
<td class="nump">1,750,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodValueOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs</a></td>
<td class="nump">$ 24<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">59,914<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">59,938<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesOther', window );">Issuance of common stock- AGP At The Market offering, net of issuance costs, shares</a></td>
<td class="nump">23,833,255<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockValueAcquiredCostMethod', window );">Acquisition of treasury stock</a></td>
<td class="text"> <span></span>
</td>
<td class="num">$ (36)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">$ (36)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockSharesAcquired', window );">Acquisition of treasury stock, shares</a></td>
<td class="text"> <span></span>
</td>
<td class="num">(16,789)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">16,789<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax', window );">Other comprehensive gain/(loss)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(2)<span></span>
</td>
<td class="num">$ (2)<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockholdersEquity', window );">Balance at Jan. 31, 2021</a></td>
<td class="nump">$ 51<span></span>
</td>
<td class="num">$ (338)<span></span>
</td>
<td class="nump">$ 310,342<span></span>
</td>
<td class="num">$ (1,983)<span></span>
</td>
<td class="num">$ (229,696)<span></span>
</td>
<td class="num">$ (177)<span></span>
</td>
<td class="nump">$ 78,199<span></span>
</td>
</tr>
<tr class="rc">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesOutstanding', window );">Balance, shares at Jan. 31, 2021</a></td>
<td class="nump">50,589,809<span></span>
</td>
<td class="num">(21,040)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ExerciseOfCommonWarrantsNetOfCosts">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise of common warrants, net of costs.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ExerciseOfCommonWarrantsNetOfCosts</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ExerciseOfCommonWarrantsNetOfCostsShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise of common warrants, net of costs, shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ExerciseOfCommonWarrantsNetOfCostsShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise of prefunded warrants, net of issuance costs.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCosts</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_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise of prefunded warrants, net of issuance costs shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ExerciseOfPrefundedWarrantsNetOfIssuanceCostsShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodSharesNewIssuesOne">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Issuance of common stock at the market offering, net of issuance costs, shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodSharesNewIssuesOne</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodValueNewIssuesOne">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Issuance of common stock at the market offering, net of issuance costs.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodValueNewIssuesOne</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 20<br> -Section 55<br> -Paragraph 12<br> -URI http://asc.fasb.org/extlink&amp;oid=120383193&amp;loc=d3e11149-113907<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5047-113901<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 20<br> -Section 55<br> -Paragraph 13<br> -URI http://asc.fasb.org/extlink&amp;oid=120383193&amp;loc=d3e11178-113907<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 35<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=121326096&amp;loc=d3e4534-113899<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetIncomeLoss">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://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 (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669619-108580<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 31<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8924-108599<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 11<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=109234566&amp;loc=d3e22694-107794<br><br>Reference 4: 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-SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8906-108599<br><br>Reference 18: 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 http://asc.fasb.org/extlink&amp;oid=109234566&amp;loc=d3e22583-107794<br><br>Reference 19: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 20: http://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 (a)<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetIncomeLoss</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherComprehensiveIncomeLossNetOfTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after tax and reclassification adjustments of other comprehensive income (loss).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1A<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669619-108580<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 30<br> -Section 45<br> -Paragraph 17<br> -URI http://asc.fasb.org/extlink&amp;oid=118261656&amp;loc=d3e32136-110900<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SX 210.5-03(21))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395209&amp;loc=SL114868664-224227<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 55<br> -Paragraph 15<br> -URI http://asc.fasb.org/extlink&amp;oid=121640130&amp;loc=d3e1436-108581<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 30<br> -Section 45<br> -Paragraph 20<br> -URI http://asc.fasb.org/extlink&amp;oid=118261656&amp;loc=d3e32211-110900<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 30<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6450520&amp;loc=d3e32583-110901<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 220<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1B<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669625-108580<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04(23))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-04(19))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400993&amp;loc=SL114874131-224263<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherComprehensiveIncomeLossNetOfTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharesOutstanding">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares issued which are neither cancelled nor held in the treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharesOutstanding</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesNewIssues">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of new stock issued during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesNewIssues</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesOther">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares of stock issued attributable to transactions classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesOther</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of share options (or share units) exercised during the current period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueNewIssues">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueNewIssues</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueOther">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Value of shares of stock issued attributable to transactions classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueOther</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Value of stock issued as a result of the exercise of stock options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29-31)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockholdersEquity">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section S99<br> -Paragraph 2<br> -Subparagraph (SAB Topic 4.E)<br> -URI http://asc.fasb.org/extlink&amp;oid=27010918&amp;loc=d3e74512-122707<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(31))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&amp;loc=d3e14064-108612<br><br>Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 323<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=114001798&amp;loc=d3e33918-111571<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockholdersEquity</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockSharesAcquired">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares that have been repurchased during the period and are being held in treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockSharesAcquired</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TreasuryStockValueAcquiredCostMethod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6405813&amp;loc=d3e23239-112655<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockValueAcquiredCostMethod</td>
</tr>
<tr>
<td style="padding-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>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022591880">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Consolidated Statements of Cash Flows (Unaudited) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
<th class="th" colspan="1">12 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract', window );"><strong>Cash flows from operating activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetIncomeLoss', window );">Net loss</a></td>
<td class="num">$ (3,151)<span></span>
</td>
<td class="num">$ (2,919)<span></span>
</td>
<td class="num">$ (9,560)<span></span>
</td>
<td class="num">$ (9,133)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract', window );"><strong>Adjustments to reconcile net loss to net cash used in operating activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax', window );">Foreign exchange (gain)/loss</a></td>
<td class="num">(3)<span></span>
</td>
<td class="nump">1<span></span>
</td>
<td class="num">(13)<span></span>
</td>
<td class="nump">5<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DepreciationDepletionAndAmortization', window );">Depreciation of fixed assets</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">106<span></span>
</td>
<td class="nump">117<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense', window );">Amortization of right of use asset</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">159<span></span>
</td>
<td class="nump">146<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Compensation expense related to stock option grants and restricted stock</a></td>
<td class="nump">115<span></span>
</td>
<td class="nump">56<span></span>
</td>
<td class="nump">338<span></span>
</td>
<td class="nump">225<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueAdjustmentOfWarrants', window );">Gain due to the change in fair value of warrant liabilities</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(6)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_GainLossOnSaleOfPropertyPlantEquipment', window );">Loss on disposal of property, plant and equipment</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract', window );"><strong>Changes in operating assets and liabilities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccountsReceivable', window );">Accounts receivable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">105<span></span>
</td>
<td class="num">(7)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerAsset', window );">Contract assets</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">188<span></span>
</td>
<td class="num">(20)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInOtherOperatingAssets', window );">Other assets</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(310)<span></span>
</td>
<td class="nump">19<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccountsPayable', window );">Accounts payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(473)<span></span>
</td>
<td class="num">(194)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInAccruedLiabilities', window );">Accrued expenses</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,192<span></span>
</td>
<td class="nump">257<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_IncreaseDecreaseInLeaseLiability', window );">Change in lease liability</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(169)<span></span>
</td>
<td class="num">(147)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerLiability', window );">Contract liabilities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(90)<span></span>
</td>
<td class="nump">107<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInOperatingActivities', window );">Net cash used in operating activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(8,525)<span></span>
</td>
<td class="num">(8,631)<span></span>
</td>
<td class="nump">$ 10,500<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract', window );"><strong>Cash flows from investing activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsToAcquireProductiveAssets', window );">Purchase of property, plant and equipment</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(17)<span></span>
</td>
<td class="num">(61)<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="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInInvestingActivities', window );">Net cash used in investing activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(17)<span></span>
</td>
<td class="num">(61)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract', window );"><strong>Cash flows from financing activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ProceedsFromPaycheckProtectionProgramLoan', window );">Proceeds from Paycheck Protection Program Loan</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">890<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromConstructionLoansPayable', window );">Proceeds from loan payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">467<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RepaymentsOfDebt', window );">Payment of loan payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(292)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromStockOptionsExercised', window );">Proceeds from stock option exercises</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">40<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceOfCommonStock', window );">Proceeds from issuance of common stock- Aspire financing net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">9,983<span></span>
</td>
<td class="nump">850<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromIssuanceInitialPublicOffering', window );">Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">66,166<span></span>
</td>
<td class="nump">1,520<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromWarrantExercises', window );">Proceeds associated with exercise of common stock warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">769<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ProceedsFromRepaymentsOfPrefundedWarrants', window );">Proceeds (costs) associated with exercise of pre-funded warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(16)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PaymentsForRepurchaseOfCommonStock', window );">Acquisition of treasury stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(36)<span></span>
</td>
<td class="num">(1)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NetCashProvidedByUsedInFinancingActivities', window );">Net cash provided by financing activities</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">77,987<span></span>
</td>
<td class="nump">2,353<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents', window );">Effect of exchange rate changes on cash, cash equivalents and restricted cash</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">32<span></span>
</td>
<td class="num">(15)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect', window );">Net increase/(decrease) in cash, cash equivalents and restricted cash</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">69,477<span></span>
</td>
<td class="num">(6,354)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash, cash equivalents and restricted cash, beginning of period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">10,930<span></span>
</td>
<td class="nump">17,159<span></span>
</td>
<td class="nump">17,159<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations', window );">Cash, cash equivalents and restricted cash, end of period</a></td>
<td class="nump">$ 80,407<span></span>
</td>
<td class="nump">$ 10,805<span></span>
</td>
<td class="nump">80,407<span></span>
</td>
<td class="nump">10,805<span></span>
</td>
<td class="nump">$ 10,930<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SupplementalCashFlowElementsAbstract', window );"><strong>Supplemental disclosure of noncash operating activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PrepaidFinancingCostsReportedInAccruedExpenses', window );">Prepaid financing costs reported in accrued expenses</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">62<span></span>
</td>
<td class="nump">13<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NoncashInvestingAndFinancingItemsAbstract', window );"><strong>Supplemental disclosure of noncash investing activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable', window );">Acquisition of property, plant and equipment through accounts payable</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">9<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NoncashFinancingItemsAbstract', window );"><strong>Supplemental disclosure of noncash financing activities:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee', window );">Common stock issued for payment of commitment fee</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">295<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram', window );">Outstanding receivable for sale of shares through AGP at the Market program</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">271<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises', window );">Outstanding receivable for sale of shares from warrant exercises</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,838<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises', window );">Outstanding receivable for sale of shares from stock option exercises</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 144<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Acquisition of property, plant and equipment through accounts payable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_AcquisitionOfPropertyPlantAndEquipmentThroughAccountsPayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_IncreaseDecreaseInLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Change in lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_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_NoncashFinancingItemsAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Supplemental disclosure of noncash financing activities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_NoncashFinancingItemsAbstract</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_OutstandingReceivableForSaleOfSharesFromStockOptionExercises">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Outstanding receivable for sale of shares from stock option exercises.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_OutstandingReceivableForSaleOfSharesFromStockOptionExercises</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Outstanding receivable for sale of shares from warrant exercises.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_OutstandingReceivableForSaleOfSharesFromWarrantExercises</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Outstanding receivable for sale of shares through AGP at the Market program.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_OutstandingReceivableForSaleOfSharesThroughAgpAtMarketProgram</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PrepaidFinancingCostsReportedInAccruedExpenses">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Prepaid financing costs reported in accrued expenses.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PrepaidFinancingCostsReportedInAccruedExpenses</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ProceedsFromPaycheckProtectionProgramLoan">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Proceeds from paycheck protection program loan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ProceedsFromPaycheckProtectionProgramLoan</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_ProceedsFromRepaymentsOfPrefundedWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Proceeds (costs) associated with exercise of pre-funded warrants.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ProceedsFromRepaymentsOfPrefundedWarrants</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_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Common stock issued for payment of commitment fee.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringThePeriodValueForPaymentOfCommitmentFee</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121583591&amp;loc=SL98516268-108586<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3521-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3044-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 230<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=98513438&amp;loc=d3e33268-110906<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DepreciationDepletionAndAmortization">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (e)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8736-108599<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DepreciationDepletionAndAmortization</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies. Excludes amounts for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 230<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=98513438&amp;loc=d3e33268-110906<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_FairValueAdjustmentOfWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expense (income) related to adjustment to fair value of warrant liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&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 480<br> -SubTopic 10<br> -Section 25<br> -Paragraph 13<br> -URI http://asc.fasb.org/extlink&amp;oid=109262497&amp;loc=d3e20148-110875<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueAdjustmentOfWarrants</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=109240200&amp;loc=d3e30690-110894<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 35<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121605123&amp;loc=d3e30226-110892<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 10<br> -Section 45<br> -Paragraph 17<br> -URI http://asc.fasb.org/extlink&amp;oid=120253306&amp;loc=d3e28228-110885<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 830<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6450222&amp;loc=d3e30840-110895<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ForeignCurrencyTransactionGainLossBeforeTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_GainLossOnSaleOfPropertyPlantEquipment">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_GainLossOnSaleOfPropertyPlantEquipment</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInAccountsPayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInAccountsPayable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInAccountsReceivable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInAccountsReceivable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInAccruedLiabilities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInAccruedLiabilities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInContractWithCustomerAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInContractWithCustomerAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInContractWithCustomerLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_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_IncreaseDecreaseInOperatingCapitalAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInOperatingCapitalAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInOtherOperatingAssets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in operating assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInOtherOperatingAssets</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInFinancingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInFinancingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInInvestingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3521-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInInvestingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3536-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3521-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInOperatingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://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 (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669619-108580<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 31<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8924-108599<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 11<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=109234566&amp;loc=d3e22694-107794<br><br>Reference 4: 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Codification<br> -Topic 205<br> -SubTopic 20<br> -Section 50<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=109222650&amp;loc=SL51721683-107760<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 4<br> -URI http://asc.fasb.org/extlink&amp;oid=109234566&amp;loc=d3e22595-107794<br><br>Reference 9: 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 (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121641772&amp;loc=SL7669625-108580<br><br>Reference 10: 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 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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 1<br> -Subparagraph (b)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=109234566&amp;loc=d3e22499-107794<br><br>Reference 15: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 250<br> -SubTopic 10<br> -Section 50<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=109234566&amp;loc=d3e22663-107794<br><br>Reference 16: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 825<br> -SubTopic 10<br> -Section 50<br> -Paragraph 28<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=75031198&amp;loc=d3e14064-108612<br><br>Reference 17: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8906-108599<br><br>Reference 18: 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 http://asc.fasb.org/extlink&amp;oid=109234566&amp;loc=d3e22583-107794<br><br>Reference 19: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(g)(1)(ii))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><br>Reference 20: http://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 (a)<br> -URI 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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_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_NoncashInvestingAndFinancingItemsAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NoncashInvestingAndFinancingItemsAbstract</td>
</tr>
<tr>
<td style="padding-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_OperatingLeaseRightOfUseAssetAmortizationExpense">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of amortization expense for right-of-use asset from operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsForRepurchaseOfCommonStock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow to reacquire common stock during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsForRepurchaseOfCommonStock</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PaymentsToAcquireProductiveAssets">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 13<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3213-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PaymentsToAcquireProductiveAssets</td>
</tr>
<tr>
<td style="padding-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_ProceedsFromConstructionLoansPayable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from borrowings to finance the cost of construction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromConstructionLoansPayable</td>
</tr>
<tr>
<td style="padding-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_ProceedsFromIssuanceInitialPublicOffering">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received from entity's first offering of stock to the public.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceInitialPublicOffering</td>
</tr>
<tr>
<td style="padding-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_ProceedsFromIssuanceOfCommonStock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow from the additional capital contribution to the entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromIssuanceOfCommonStock</td>
</tr>
<tr>
<td style="padding-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_ProceedsFromStockOptionsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow from exercise of option under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2A<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=SL79508275-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 14<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3255-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromStockOptionsExercised</td>
</tr>
<tr>
<td style="padding-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_ProceedsFromWarrantExercises">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received from holders exercising their stock warrants.</p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801031590072">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Background, Basis of Presentation and Liquidity<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock', window );">Background, Basis of Presentation and Liquidity</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(1) Background, Basis of Presentation and
Liquidity</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><b><i>a) Background</i></b></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: 0; text-align: justify">Ocean Power Technologies, Inc. (the &#8220;Company&#8221;,
&#8220;we&#8221;, &#8220;us&#8221;, &#8220;our&#8221;) was founded in 1984 in New Jersey, commenced business operations in 1994
and re-incorporated in Delaware in 2007. We are a marine power solutions provider. We control the design, manufacture, sales, installation,
operations and maintenance of our products and solutions while working closely with partners that provide payloads, integration
services, and marine installation capabilities. We believe our solutions provide persistent and reliable distributed offshore power
along with communications for remote surface and subsea applications. Our mission and purpose are to utilize our proprietary, state-of-the-art
technologies to enhance the environment by reducing the global carbon footprint through clean and renewable solutions for reliable
electrical power and, in so doing, drive demand for our products and services. Before 2015, government agencies had accounted for
a significant portion of the Company&#8217;s revenues. These revenues were largely for the support of product development efforts
relating to our technology. Today our goal is to generate the majority of our revenue from the commercialization of products and
solutions, and sales of services to support our business operations. As we continue to develop and commercialize our products and
services, we expect to use our cash on hand and cash from operating activities to support our business until we can achieve positive
cash flow from the commercialization of solutions, products and services.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt">&#160;</p>

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

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The accompanying unaudited consolidated financial
statements have been prepared in accordance with accounting principles generally accepted in the United States of America (&#8220;GAAP&#8221;)
and for interim financial information in accordance with the Securities and Exchange Commission (&#8220;SEC&#8221;), instructions
to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP
for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered
necessary for a fair presentation have been included. The interim operating results are not necessarily indicative of the results
for a full year or for any other interim period. Further information on potential factors that could affect the Company&#8217;s
financial results can be found in the Company&#8217;s Annual Report on Form 10-K for the year ended April 30, 2020 filed with the
SEC and elsewhere in this Form 10-Q.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt">&#160;</p>

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

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Our consolidated financial statements have
been prepared assuming the Company will continue as a going concern. The Company has experienced recurring losses from operations,&#160;and
has used net cash in operating activities of approximately $8.5 million through the nine months ended January 31, 2021 and approximately
$10.5 million for the fiscal year ending April 30, 2020 all of&#160;which have contributed to an accumulated deficit of $229.7
million as of January 31, 2021. These factors raise substantial doubt about the Company&#8217;s ability to continue as a going
concern. As of January 31, 2021, based in large part on the equity raises discussed below, the Company had approximately $79.8
million in&#160;unrestricted&#160;cash and cash equivalents on hand. Based on the Company&#8217;s current&#160;unrestricted&#160;cash
and cash equivalents balances, and its ability to raise additional equity under facilities currently in place, the Company believes
that it will be able to finance its capital requirements and&#160;operations&#160;for at least the next 12 months&#160;from the
date of this Report.&#160;The Company expects to continue to fund our business with sales of our securities and through generating
revenue with customers. The Company cannot provide assurances that it will be able to secure additional funding when needed or
at all, or, if secured, that such funding would be on favorable terms. The Company also cannot provide assurances that it will
generate sufficient revenue from customers to fund our business.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The consolidated financial statements have
been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the normal
course of business. The consolidated financial statements do not include any adjustments relating to the recoverability and classification
of recorded assets amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Management continues to evaluate different
strategies to obtain the required additional funding for future operations. These strategies may include, but are not limited to,
continued pursuit of business opportunities, additional funding from current and /or new investors, officers and directors; borrowings
of debt; or a public offering of the Company&#8217;s equity or debt securities, or the acquisition of third-party entities that
have similar business focuses. There can be no assurance that any of these future-funding efforts will be successful. The Company
currently has committed sources of equity financing through&#160;it&#8217;s&#160;At the Market Offering Agreement with A.G.P/Alliance
Global Partners (&#8220;AGP&#8221;) and its equity line with Aspire Capital (discussed further below), 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. Historically,
the Company has raised capital through securities sales in the public capital markets. The sale of additional equity or convertible
securities could result in dilution to stockholders. If additional funds are raised through the issuance of debt securities, these
securities could have rights senior to those associated with the Company&#8217;s common stock and could contain covenants that
would restrict its operations. Financing may not be available in amounts or on terms acceptable to the Company, or at all. If the
Company is unable to obtain required financing, the Company may be required to curtail or limit operations, product development
costs, and/or selling, general and administrative activities in order to reduce its cash expenditures, including its planned product
development and marketing efforts, which could materially and adversely harm its financial condition and operating results. If
the Company is unable to secure additional financing, it may be unable to execute its business plan, take advantage of future opportunities
or be forced to cease operations.</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: 0; text-align: justify">In fiscal year 2020 and during the first nine
months of fiscal year 2021 ended January 31, 2021, the Company has continued to make investments in ongoing product development
efforts in anticipation of future growth. The Company&#8217;s future results of operations involve significant risks and uncertainties.
Factors that could affect the Company&#8217;s future operating results and cause actual results to vary materially from expectations
include, but are not limited to, risks from lack of available financing and insufficient capital, performance of products, its
inability to market and commercialize its products and new products that it may develop, technology development, scalability of
technology and production, dependence on skills of key personnel, concentration of customers and suppliers, deployment risks and
laws, regulations and permitting.</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: 0; text-align: justify"><i>At the Market Offering Agreements</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: 0; text-align: justify">On January 7, 2019, the Company entered into
an At the Market Offering Agreement (&#8220;2019 ATM Facility&#8221;) with AGP, under which the Company may issue and sell to or
through AGP, acting as agent and/or principal, shares of the Company&#8217;s common stock having an aggregate offering price of
up to&#160;$25.0&#160;million. From inception of the program through its termination on December 8, 2020, under the 2019 ATM Facility,
the Company sold and issued an aggregate of 17,595,472 shares of its common stock with an aggregate market value of $23.4 million
at an average price of $1.33 per share and paid AGP a sales commission of approximately $0.8 million related to those shares. The
agreement was fully utilized and terminated on December 8, 2020.</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: 0; text-align: justify">On November 20, 2020, the Company entered into
a new At the Market Offering Agreement with AGP (the &#8220;2020 ATM Facility&#8221;).&#160;The Company on December 4, 2020 filed
a prospectus with Securities and Exchange Commission whereby,&#160;the Company may issue and sell to or through AGP, acting as
agent and/or principal, shares of the Company&#8217;s common stock having an aggregate offering price of up to $50.0 million. From
inception of the 2020 ATM Facility through January 31, 2021, the Company sold and issued an aggregate of 17,179,883 shares of its
common stock with an aggregate market value of $50.0 million at an average price of $2.91 per share and paid AGP a sales commission
of approximately $1.6 million related to those shares. The dollar amount&#160;reported&#160;in the&#160;prospectus filing&#160;is
fully utilized.</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: 0; text-align: justify"><i>Equity Line Common Stock Purchase Agreements</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: 0; text-align: justify">On October 24, 2019, the Company entered into
a common stock purchase agreement with Aspire Capital which provided that, subject to certain terms, conditions and limitations,
Aspire Capital is committed to purchase up to an aggregate of $10.0 million of shares of the Company&#8217;s common stock over
a 30-month period. Through September 18, 2020, the Company has sold an aggregate of 6,424,205 shares of common stock with an aggregate
market value of $4.0 million at an average price of $0.63 per share pursuant to this common stock purchase agreement. The agreement
was fully utilized and terminated on September 18, 2020.</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: 0; text-align: justify">On September 18, 2020, the Company entered
into a new common stock purchase agreement with Aspire Capital which provided that, subject to certain terms, conditions and limitations,
Aspire Capital is committed to purchase up to an aggregate of $12.5 million of shares of the Company&#8217;s common stock over
a 30-month period that does not exceed 19.99% of the outstanding common stock on the date of the agreement. The number of shares
the Company could issue within the 19.99% limit is 3,722,251 shares&#160;without shareholder approval.&#160;Shareholder approval
was received at the Company&#8217;s annual meeting of stockholders on December 23, 2020 for the sale of 9,864,706 additional shares
of common stock which is over the 19.99% limit of outstanding common stock on the date of the agreement. Through January 31, 2021,
the Company has sold an aggregate of 2,250,000 shares of common stock with an aggregate market value of $7.4 million at an average
price of $3.28 per share pursuant to this common stock purchase agreement.</p><span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for the business description and basis of presentation concepts.  Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity.  Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).</p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801027842152">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
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<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(2) Summary of Significant Accounting Policies</b></p>

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

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

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(b) Use of Estimates</i></b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white">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 and the disclosure of contingent 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 estimated costs to complete projects; and the input method used to measure completion over time of customer
contracts for purposes of revenue recognition. Actual results could differ from those estimates.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(c) Cash, Cash Equivalents, Restricted
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>&#160;</i></b></p>

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

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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<tr style="vertical-align: bottom">
    <td>&#160;</td>
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<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td>&#160;</td>
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</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><b>&#160;</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><i>Restricted Cash and Security Agreements</i></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: 0; text-align: justify">The Company has two agreements with Santander&#160;Bank,
N.A. (&#8220;Santander&#8221;).&#160;Cash 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&#160;cancellable&#160;at the discretion of the bank. Santander also issued two letters of credit to subsidiaries of Enel
Green Power (&#8220;EGP&#8221;) pursuant to the Company&#8217;s contracts with EGP. The first letter of credit was issued in the
amount of $125,690 that expires in May 2021. The second letter of credit was issued in the amount of $645,467 and reduced to $322,734
in August 2020.&#160;The&#160;second letter of credit&#160;will be&#160;reduced to $64,547&#160;once the PB3 PowerBuoy<sup>&#174;</sup>&#160;is
fully deployed and passes final acceptance testing .&#160;The remaining amount expires in December 2021.</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: 0; text-align: justify">Restricted cash includes the following:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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    <td>&#160;</td>
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<tr style="vertical-align: bottom">
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    <td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>January 31, 2021</b></font></td>
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    <td style="width: 1%">&#160;</td>
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    <td style="width: 1%">&#160;</td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 1%">&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
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    <td>&#160;</td>
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</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><b><i>&#160;</i></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The following table provides a reconciliation
of cash, cash equivalents and restricted cash reported within the Statement of Financial Position that sum to the total of the
same such amounts shown in the Statement of Cash Flows.</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>April 30, 2020</b></font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td style="border-bottom: black 1.5pt solid">&#160;</td>
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</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(d) Concentration of Credit Risk</i></b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Financial instruments that potentially subject
the Company to credit risk consist principally of accounts receivable and cash and cash equivalents. The Company believes that
its credit risk is limited because the Company&#8217;s current contracts are with companies with strong financial strength. The
Company invests its excess cash in a money market account and does not believe that it is exposed to any significant risks related
to its cash and money market accounts. Cash and cash equivalents are also maintained at foreign financial institutions. Cash and
cash equivalents in foreign financial institutions as of January 31, 2021 was $0.3 million.</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: 0; text-align: justify">The table below shows the percentage of the
Company&#8217;s revenues derived from customers whose revenues accounted for at least 10% of the Company&#8217;s consolidated revenues
for at least one of the periods indicated:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">A performance obligation is the unit of account
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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.</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The nature of the Company&#8217;s contracts
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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. Accounting Standards Update (&#8220;ASU&#8221;)
2016-10 provides a practical expedient that permits presentation of shipping and handling costs, that occur after control of the
promised goods or services transfer to the customer, as fulfillment costs rather than evaluating whether the shipping and handling
activities are promised services to the customer. The Company adopted this practical expedient, but it did not have a material
effect on its Consolidated Financial Statements.</p>

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

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and services specified in the contract, a profit or loss is recognized depending on whether actual costs are more or less than
the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the customer is only intended to fund a
portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding to the revenue is recorded in
cost of revenues, resulting in gross profit on these contracts of zero. The Company&#8217;s share of the costs is recorded as product
development expense. The Company reports its disaggregation of revenue by contract type since this method best represents the Company&#8217;s
business. For the nine-month periods ended January 31, 2021 and 2020, all of the Company&#8217;s contracts were classified as firm
fixed price.</p>

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

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company enters into lease arrangements
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operating lease term of less than 10 months. Revenue related to multiple-element arrangements is allocated to lease and non-lease
elements based on their relative standalone selling prices or expected cost plus a margin approach. Lease elements generally include
a PB3 PowerBuoy<sup>&#174;</sup>&#160;<i>(&#8220;</i>PB3&#8221;) 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
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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.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">&#160;</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(g) Net Loss per Common Share</i></b></p>

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

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stock issued to employees and non-employee directors, totaling 5,221,258 and 5,565,462 for the three and nine months ended January
31, 2021 and 2020, respectively, were excluded from each of the computations as the effect would be anti-dilutive due to the Company&#8217;s
net losses.</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In June 2016, the Financial Accounting Standards
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Measurement of Credit Losses on Financial Instruments.&#8221;&#160;</i>The amendment in this update 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,&#160;<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.</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In August 2018, the FASB issued ASU No. 2018-13,&#160;<i>&#8220;Fair
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measurements in Topic 820, Fair Value Measurement. The amendments on changes in unrealized gains and losses, the range and weighted
average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement
uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year
of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The Company
adopted this guidance effective May 1, 2020. The adoption of the guidance did not have a material effect on its Consolidated Financial
Statements.</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In August 2018, the FASB issued ASU No. 2018-15,
&#8220;<i>Intangibles&#160;</i>&#8212;&#160;<i>Goodwill and Other&#160;</i>&#8212;&#160;<i>Internal-Use Software (Subtopic 350-40):
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ASU requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance
in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. The ASU
permits two methods of adoption: prospectively to all implementation costs incurred after the date of adoption, or retrospectively
to each prior reporting period presented. The Company adopted this guidance on a prospective basis effective May 1, 2020. The
adoption of the guidance did not have a material effect on its Consolidated Financial Statements.</p><span></span>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801029276280">
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<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">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract', window );"><strong>Account Receivable Contract Assets And Contract Liabilities</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AccountReceivableContractAssetsAndContractLiabilitiesTextBlock', window );">Account Receivable, Contract Assets, and Contract Liabilities</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(3) Account Receivable, Contract Assets,
and Contract Liabilities</b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The following provides further details on the
balance sheet accounts of accounts receivable, contract assets, and contract liabilities from contracts with customers:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>January 31, 2021</b></font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>April 30, 2020</b></font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="6" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">(in thousands)</font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td style="width: 63%"><font style="font: 10pt Times New Roman, Times, Serif">Accounts receivable</font></td>
    <td style="width: 2%">&#160;</td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="width: 15%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">-</font></td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="width: 15%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">105</font></td>
    <td style="width: 1%">&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: white">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Contract assets</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">63</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">251</font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Contract liabilities</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">75</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">165</font></td>
    <td>&#160;</td></tr>
</table>
<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: 0; text-align: justify"><i>Accounts Receivable</i></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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 good has transferred to the customer. Accounts receivable represents an
unconditional right to consideration arising from the Company&#8217;s performance under contracts with customers. The carrying
value of such receivables represent their estimated realizable value.</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><i>Contract Assets</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: 0; text-align: justify">Significant changes in the contract assets
balances during the period are as follows:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>Nine months ended</b></font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>January 31, 2021</b></font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">(in thousands)</font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td style="width: 77%"><font style="font: 10pt Times New Roman, Times, Serif">Transferred to receivables from contract assets recognized at the beginning of the period</font></td>
    <td style="width: 2%">&#160;</td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="width: 19%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(251</font></td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">)</font></td></tr>
<tr style="vertical-align: bottom; background-color: white">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Revenue recognized and not billed as of the end of the period</font></td>
    <td>&#160;</td>
    <td style="border-bottom: black 1.5pt solid">&#160;</td>
    <td style="border-bottom: black 1.5pt solid; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">63</font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Net change in contract assets</font></td>
    <td>&#160;</td>
    <td style="border-bottom: black 2.25pt double"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="border-bottom: black 2.25pt double; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(188</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">)</font></td></tr>
</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><i>&#160;</i></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Contract assets include unbilled amounts typically
resulting from arrangements whereby the right to payment is conditioned on completing additional tasks or services for a performance
obligation. The decrease in contract assets is primarily a result of services performed relating to our project with EGP that was
billed during the nine months ended January 31, 2021.</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: 0; text-align: justify"><i>Contract Liabilities</i></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: 0; text-align: justify">Significant changes in the contract liabilities
balances during the period are as follows:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>Nine months ended</b></font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>January 31, 2021</b></font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">(in thousands)</font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2">&#160;</td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td style="width: 77%"><font style="font: 10pt Times New Roman, Times, Serif">Revenue recognized that was included in the contract liabilities balance as of the beginning of the period</font></td>
    <td style="width: 2%">&#160;</td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="width: 19%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(84</font></td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">)</font></td></tr>
<tr style="vertical-align: bottom; background-color: white">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Transferred to contract assets from contract liabilities recognized at the beginning of the period</font></td>
    <td>&#160;</td>
    <td style="border-bottom: black 1.5pt solid">&#160;</td>
    <td style="border-bottom: black 1.5pt solid; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(6</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">)</font></td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Net change in contract liabilities</font></td>
    <td>&#160;</td>
    <td style="border-bottom: black 2.25pt double"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="border-bottom: black 2.25pt double; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(90</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">)</font></td></tr>
</table>
<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: 0; text-align: justify">Contract liabilities consist of amounts invoiced
to customers in excess of revenue recognized. The decrease in contract liabilities is primarily due to recognition of revenue
relating to our Eni S.p.A. (&#8220;Eni&#8221;) project during the nine months ended January 31, 2021.</p><span></span>
</td>
</tr>
</table>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Account Receivable, Contract Assets, and Contract Liabilities [Text Block]</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801032199720">
<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">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_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="top.Show.showAR( this, 'defref_us-gaap_OtherCurrentAssetsTextBlock', window );">Other Current Assets</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(4) Other Current Assets</b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Other current assets consist of the following
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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    <td style="text-align: justify">&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td style="text-align: justify">&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td style="text-align: justify">&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: justify">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: justify">&#160;</td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
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    <td style="width: 1%">&#160;</td>
    <td style="width: 1%">&#160;</td>
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    <td style="text-align: justify"><font style="font: 10pt Times New Roman, Times, Serif">Other receivables</font></td>
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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td style="text-align: justify"><font style="font: 10pt Times New Roman, Times, Serif">Prepaid offering costs</font></td>
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    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
    <td>&#160;</td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p><span></span>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for other current assets.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801031599272">
<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">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentAbstract', window );"><strong>Property, Plant and Equipment [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock', window );">Property and Equipment, Net</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(5) Property and Equipment, net</b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The components of property and equipment, net
as of January 31, 2021 and April 30, 2020 consisted of the following:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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    <td colspan="6" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">(in thousands)</font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
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    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
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    <td><font style="font: 10pt Times New Roman, Times, Serif">Construction in process</font></td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Less: accumulated depreciation</font></td>
    <td>&#160;</td>
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    <td style="border-bottom: black 1.5pt solid; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(1,255</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">)</font></td>
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    <td style="border-bottom: black 1.5pt solid; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(1,157</font></td>
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<tr style="vertical-align: bottom; background-color: white">
    <td>&#160;</td>
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    <td style="border-bottom: black 2.25pt double"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="border-bottom: black 2.25pt double; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">417</font></td>
    <td>&#160;</td>
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    <td style="border-bottom: black 2.25pt double"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Depreciation expense was approximately $33,000
and $40,000 for the three-month periods ended January 31, 2021 and 2020, and approximately $106,000 and $117,000 for the nine-month
periods ended January 31, 2021 and 2020, respectively.</p><span></span>
</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentAbstract</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 958<br> -SubTopic 360<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=120429125&amp;loc=d3e99893-112916<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -URI http://asc.fasb.org/topic&amp;trid=2155823<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 958<br> -SubTopic 360<br> -Section 50<br> -Paragraph 7<br> -URI http://asc.fasb.org/extlink&amp;oid=120429125&amp;loc=SL120174063-112916<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 958<br> -SubTopic 360<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=120429125&amp;loc=d3e99779-112916<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801029291112">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeasesAbstract', window );"><strong>Leases [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeasesTextBlock', window );">Leases</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(6) Leases</b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><i>Lessor Information</i></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><i>&#160;</i></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">As of January 31, 2021, the Company
has one lease which has been classified as an operating lease per accounting guidance contained within ASC Topic 842,&#8221;&#160;<i>Leases&#8221;</i>.
The Company&#8217;s remaining term on this operating lease is less than 10 months. The maturity of lease payments remaining on
this lease is immaterial.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><i>&#160;</i></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"><i>Lessee Information</i></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify">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. The initial lease term is for 7 years with an option to extend the lease for another 5 years. 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.</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: 0 0 0 2.15pt; text-align: justify">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. Lease expense for minimum lease
payments is recognized on a straight- line basis over the lease term and consists of interest on the lease liability and the amortization
of the right of use asset. Variable lease expenses, if any, are recorded as incurred.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On June 10, 2020 the Company signed a 12-month
lease for office space in Houston, Texas. The lease can be extended by the Company by providing the lessor on or before the notice
date of the Company&#8217;s intent to renew or terminate the lease. ASC Topic 842,&#160;<i>&#8220;Leases&#8221;</i>&#160;allows
a company an accounting policy election to recognize lease payments to the Consolidated Statement of Operations on a straight-line
basis if the lease term is equal to or less 12 months and not recognize a right-of use asset and lease liability. The accounting
policy&#160;election&#160;is made on the commencement date of the lease.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">The operating lease cash flow payments
for the nine months ended January 31, 2021 and 2020 was $259,000 and $240,000, respectively.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">&#160;&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify">The components of lease expense
in the Consolidated Statement of Operations for both the three and nine months ended January 31, 2021 and 2020 was as follows:</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: center">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td>&#160;</td>
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    <td colspan="14" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">(in thousands)</font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">&#160;</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom">
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    <td>&#160;</td>
    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>&#160;</b></p>

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

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    <td>&#160;</td></tr>
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><b></b></p><span></span>
</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -URI http://asc.fasb.org/subtopic&amp;trid=77888251<br></p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801107000280">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Accrued Expenses<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
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<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(7) Accrued Expenses</b></p>

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<a href="javascript:void(0);" onclick="top.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>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(a),20,24)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801107000280">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Warrants<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
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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="top.Show.showAR( this, 'defref_OPTT_WarrantDisclosureTextBlock', window );">Warrants</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(8) Warrants</b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><i>Liability Classified Warrants</i></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: 0; text-align: justify">On June 2, 2016, the Company entered into a
securities purchase agreement, which was amended on June 7, 2016 (as amended, the &#8220;June Purchase Agreement&#8221;) with certain
institutional purchasers (the &#8220;June Purchasers&#8221;). Pursuant to the terms of the June Purchase Agreement, the Company
sold an aggregate of 20,850 shares of Common Stock together with warrants to purchase up to an aggregate of 7,298 shares of Common
Stock. The warrants have an exercise price of $121.60 per share, became exercisable on December 3, 2016 (&#8220;Initial Exercise
Date&#8221;), and will expire five years following the Initial Exercise Date. As of January 31, 2021, none of the warrants&#160;had&#160;been
exercised.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 42.9pt">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On July 22, 2016, the Company entered into
a Second Amendment to the Purchase Agreement (the &#8220;Second Amended Purchase Agreement&#8221;) with certain institutional purchasers
(the &#8220;July Purchasers&#8221;). Pursuant to the terms of the Second Amended Purchase Agreement, the Company sold an aggregate
of 29,750 shares of Common Stock together with warrants to purchase up to an aggregate of 8,925 shares of Common Stock. The Warrants
were exercisable immediately at an exercise price of $187.20 per share. The Warrants will expire on the fifth (5th) anniversary
of the initial date of issuance. As of January 31, 2021, none of the warrants&#160;had&#160;been exercised.</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: 0; text-align: justify"><i>Equity Classified Warrants</i></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: 0 0 0 2.15pt; text-align: justify">On April 8, 2019, the Company issued
and sold 1,542,000 shares of common stock and pre-funded warrants to purchase up to 3,385,680 shares of common stock and common
warrants to purchase up to 4,927,680 shares of our common stock in an underwritten public offering. The public offering price for
the pre-funded warrants was equal to the public offering price of the common stock, less the $0.01 per share exercise price of
each warrant. As of January 31, 2021, all of the pre-funded warrants&#160;had&#160;been exercised. The common stock warrants have
an exercise price of $3.85 per share and expire five years from the issuance date. From the issuance to January 31, 2021, warrants
to purchase 677,500 shares of the common stock&#160;had&#160;been exercised.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company accounted for the warrants issued
in connection with its June and July 2016 public offerings in accordance with the guidance in Topic 480 which provides that the
Company classify the warrant instruments as a liability at its fair value. The warrant liabilities are subject to re-measurement
at each balance sheet date using the Black-Scholes option pricing model. The June and July 2016 warrants contain a feature whereby
they could require the transfer of assets and therefore are classified as a liability award in accordance with the guidance in
Topic 480. The warrants have a value close to zero at January 31, 2021 and April 30, 2020 and are reflected within &#8220;Warrant
liabilities&#8221; in the Consolidated Balance Sheets. 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 stockholders&#8217; equity in the Consolidated Balance Sheets.</p><span></span>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801026088968">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Paycheck Protection Program Loan<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtDisclosureAbstract', window );"><strong>Debt Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(9) Paycheck Protection Program Loan</b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">As a result of the COVID-19 pandemic, 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;)
which included the ability to secure loans under the Paycheck Protection Program (&#8220;PPP&#8221;). On May 3, 2020, after its
application was submitted and approved, the Company signed a PPP loan with Santander as the lender for $890,347 pursuant to the
PPP under the CARES Act, as implemented by the U.S. Small Business Association (&#8220;SBA&#8221;). The PPP loan is an unsecured
note with Santander as the lender and governed by a loan agreement with Santander. The interest rate is 1% and the loan is repayable
over two years. The loan contains customary events of defaults relating to, among other things, payment defaults or breaches of
the terms of the loan. Upon the occurrence of an event of default, the lender may require immediate repayment of all outstanding
amounts under the loan. Interest and principal payments are deferred for the first 6 months from the date of the loan. Principal
and interest of approximately $49,000 are payable monthly commencing 6 months after the disbursement date and may be repaid by
the Company at any time prior to maturity with no prepayment penalties. The Company received the proceeds on May 5, 2020.</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The SBA allows loan forgiveness for eligible
costs incurred and paid which include (a) payroll costs, (b) interest on any real or personal property mortgage prior to February
15, 2020, (c) rent on any lease in force prior to February 15, 2020, and (d) utility payments for which service began before February
15, 2020. As of January 31, 2021, the Company has utilized all of the loan proceeds. The Company currently believes that the use
of the loan proceeds will meet the conditions for forgiveness of the loan and has submitted a loan forgiveness application to the
SBA asking for 100% forgiveness of the loan. No assurance can be provided that the Company will obtain forgiveness of the loan,
in whole or in part.</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: 0; text-align: justify">On June 5, 2020, the Paycheck Protection Program
Flexibility Act (&#8220;PPPFA&#8221;) was signed into law. Among other changes, the PPPFA (a) reduced the amount of the loan required
to be spent on payroll costs from 75% to 60%, (b) extended the covered period to 24 weeks from 8 weeks, (c) extended the repayment
term of the PPP loan from 2 years to 5 years, and (d) increased the deferred payment date from 6 months to 10 months. For the loans
disbursed before June 5, 2020, the PPPFA provides the option to opt for 24 weeks for spending the loan instead of 8 weeks. The
Company opted for 24 weeks to spend the loan.</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: 0; text-align: justify">The Company is accruing interest expense until
the loan is forgiven or repaid. If the loan were not forgiven by the SBA and the Company decided to repay the loan over 2 years,
the interest expense for this loan period would be immaterial.</p><span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 470<br> -URI http://asc.fasb.org/topic&amp;trid=2208564<br></p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801029196344">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Loan Payable<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In August 2020 the Company signed a commercial
premium finance agreement in the amount of $466,622 with First Insurance Funding whereas First Insurance Funding prepaid a portion
of the Company insurance premiums including principally the Directors and Officers insurance. The Company will make eight monthly
payments of $58,957, inclusive of interest charges, to repay First Insurance Funding the amount. Interest expense for the loan
period is immaterial.</p><span></span>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801029019512">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for terms, amounts, nature of changes, rights and privileges, dividends, and other matters related to preferred stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -URI http://asc.fasb.org/topic&amp;trid=2208762<br></p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801029343880">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Common Stock<br></strong></div></th>
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<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(12) Common Stock</b></p>

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a prospectus with Securities and Exchange Commission whereby,&#160;the Company may issue and sell to or through AGP, acting as
agent and/or principal, shares of the Company&#8217;s common stock having an aggregate offering price of up to $50.0 million.&#160;From&#160;inception
of the 2020 ATM Facility through January 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. The dollar amount&#160;reported&#160;in the&#160;prospectus filing&#160;is
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Aspire Capital is committed to purchase up to an aggregate of $10.0 million of shares of the Company&#8217;s common stock over
a 30-month period. Through September 18, 2020, the Company has sold an aggregate of 6,424,205 shares of common stock with an aggregate
market value of $4.0 million at an average price of $0.63 per share pursuant to this common stock purchase agreement, including
5,025,000 shares in fiscal year 2021 with an aggregate market value of $2.9 million at an average price of $0.57 per share. The
agreement was fully utilized and terminated on September 18, 2020.</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On September 18, 2020, the Company entered
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Aspire Capital is committed to purchase up to an aggregate of $12.5 million of shares of the Company&#8217;s common stock over
a 30-month period that does not exceed 19.99% of the outstanding common stock on the date of the agreement. The number of shares
the Company could issue within the 19.99% limit is 3,722,251 shares&#160;without shareholder approval.&#160;Shareholder approval
was received at the Company&#8217;s annual meeting of stockholders on December 23, 2020 for the sale of 9,864,706 additional shares
of common stock which is over the 19.99% limit of the outstanding common stock on the date of the agreement. Through January 31,
2021, the Company has sold an aggregate of 2,250,000 shares of common stock with an aggregate market value of $7.4 million at
an average price of $3.28 per share pursuant to this common stock purchase agreement.</p><span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 235<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.4-08(e)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120395691&amp;loc=d3e23780-122690<br><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 S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -URI http://asc.fasb.org/topic&amp;trid=2208762<br></p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801033243336">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 30<br> -URI http://asc.fasb.org/subtopic&amp;trid=2208821<br></p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801032803384">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Share-Based Compensation<br></strong></div></th>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In 2015, upon approval by the Company&#8217;s
stockholders, the Company&#8217;s 2015 Omnibus Incentive Plan (the &#8220;2015 Plan&#8221;) became effective. A total of 1,332,036
shares are authorized for issuance under the 2015 Omnibus Incentive Plan, including shares available for awards under the 2006
Stock Incentive Plan remaining at the time that plan terminated, or that were subject to awards under the 2006 Stock Incentive
Plan that thereafter terminated by reason of expiration, forfeiture, cancellation or otherwise. If any award under the 2006 Stock
Incentive Plan or 2015 Plan expires, is cancelled, terminates unexercised or is forfeited, those shares become again available
for grant under the 2015 Plan. The 2015 Plan will terminate ten years after its effective date, in October 2025, but is subject
to earlier termination as provided in the 2015 Plan. As of January 31, 2021, the Company has 193,928 shares available for future
issuance under the 2015 Plan.</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: 0; text-align: justify">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 25,000 shares of common stock for issuance under the Inducement Plan. In accordance with Rule 5635(c)(4)
and Rule 5635(c)(3) of the Nasdaq Listing Rules, 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. As of January 31, 2021, there were 11,487 shares available for grant under the 2018
Inducement Plan.</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: 0; text-align: justify"><i>Stock Options</i></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company estimates the fair value of each
stock option award granted with service-based vesting requirements, using the Black-Scholes option pricing model, assuming no dividends,
and using the weighted average valuation assumptions noted in the following table. The risk-free rate is based on the US Treasury
yield curve in effect at the time of grant. The expected life (estimated period of time outstanding) of the stock options granted
is estimated using the &#8220;simplified&#8221; method as permitted by the SEC&#8217;s Staff Accounting Bulletin No. 110,&#160;<i>Share-Based
Payment.</i>&#160;Expected volatility is based on the Company&#8217;s historical volatility over the expected life of the stock
option granted. The Company granted options to acquire 248,876 and 411,666 shares of common stock during the&#160;three and&#160;nine
months ended January 31, 2021 and 2020. The following assumptions were used to value the awards:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">A summary of stock options under our stock
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">As of January 31, 2021, the total intrinsic
value of outstanding and exercisable options was approximately $0.9 million and $0.6 million, respectively. As of January 31, 2021,
approximately 269,208 additional options were unvested, which had an intrinsic value of $0.3 million and a weighted average remaining
contractual term of 9.9 years.&#160;There was approximately $82,000 and $44,000 of total recognized compensation cost related to
stock options during each of the three months ended January 31, 2021 and 2020, respectively.&#160;There was approximately $0.3
million and $0.2 million of total recognized compensation cost related to stock options during each of the nine months ended January
31, 2021 and 2020, respectively. As of January 31, 2021, there was approximately $0.7 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 1.9 years.</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: 0; text-align: justify"><i>Performance Stock Options</i></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In January of 2020, the Company issued 81,334
performance-based stock options to two of its executives. The awards can vest over 2 years if there is positive total shareholder
return (e.g. share price increase) as measured to the 5-day (January 11-15, 2021) and (January 10-14, 2022) share price Volume
Weighted Average Price (&#8220;VWAP&#8221;).</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In January of 2021, the Company issued 344,723
performance-based stock options to employees and executives. The awards vest over 2 years provided there is positive total shareholder
return (e.g. share price increase) as measured to the closing share price on January 14, 2022 and January 14, 2023.</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: 0; text-align: justify">The Company determined these awards contain
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</p>

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

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

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">As of January 31, 2021, the total intrinsic
value of both outstanding and exercisable options was approximately $0.6 million and zero, respectively. As of January 31, 2021,
approximately 385,389 additional options were unvested, which had an intrinsic value of $0.5 million and a weighted average remaining
contractual term of 9.8 years.&#160;There was approximately $26,000 and $1,600 of total recognized compensation cost related to
stock options during each of the three months ended January 31, 2021 and 2020, respectively.&#160;There was approximately $43,000
and $1,600 of total recognized compensation cost related to stock options during each of the nine months ended January 31, 2021
and 2020, respectively. As of January 31, 2021, there was approximately $0.7 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 1.8
years.</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: 0; text-align: justify"><i>Restricted Stock</i></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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&#160;three and&#160;nine months ended January 31, 2021 and 2020, the Company granted 10,000 and
13,513 shares subject to service-based vesting requirements.</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">A summary of non-vested restricted stock under
our stock incentive plans is as follows:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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<tr style="vertical-align: bottom; background-color: white">
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
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</table>
<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: 0; text-align: justify">There was approximately $2,000 and $5,000 of
total recognized compensation cost related to restricted stock for the three months ended January 31, 2021 and 2020, respectively.&#160;There
was approximately $12,000 and $10,000 of total recognized compensation cost related to restricted stock for the nine months ended
January 31, 2021 and 2020, respectively. As of January 31, 2021, there is $28,000 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
1.0 years.</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In December 2019, the Company granted 51,547
shares, subject to service-based vesting requirements, to an employee that were outside the Company stock incentive plans.&#160;There
was approximately $5,000 and $7,000 of total recognized compensation cost related to this award for the three months ended January
31, 2021 and 2020, respectively.&#160;There was approximately $30,000 and $8,000 of total recognized compensation cost related
to this award for the nine months ended January 31, 2021 and 2020, respectively. As of January 31, 2021, there is no unrecognized
compensation cost remaining related to this award.</p><span></span>
</td>
</tr>
</table>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -URI http://asc.fasb.org/topic&amp;trid=2228938<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<td style="white-space:nowrap;">us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock</td>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801032925864">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Fair Value Measurements<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueDisclosuresAbstract', window );"><strong>Fair Value Disclosures [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueDisclosuresTextBlock', window );">Fair Value Measurements</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(15) Fair Value Measurements</b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">ASC Topic 820,&#8221;<i>Fair Value Measurements&#8221;</i>&#160;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.</p>

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

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    <td style="width: 72px; text-align: justify"><font style="font: 10pt Times New Roman, Times, Serif">Level 1</font></td>
    <td style="text-align: justify"><font style="font: 10pt Times New Roman, Times, Serif">Unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.</font></td></tr>
<tr style="vertical-align: top">
    <td>&#160;</td>
    <td>&#160;</td></tr>
<tr style="vertical-align: top">
    <td style="text-align: justify"><font style="font: 10pt Times New Roman, Times, Serif">Level 2</font></td>
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<tr style="vertical-align: top">
    <td>&#160;</td>
    <td>&#160;</td></tr>
<tr style="vertical-align: top">
    <td style="text-align: justify"><font style="font: 10pt Times New Roman, Times, Serif">Level 3</font></td>
    <td style="text-align: justify"><font style="font: 10pt Times New Roman, Times, Serif">Inputs that are unobservable for the asset or liability.</font></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><i>Disclosure of Fair Values</i></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: 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 carrying values of these financial instruments approximate their fair values
and are viewed as Level 1 items. The Company&#8217;s warrant liabilities represent the only asset or liability classified financial
instrument that is measured at fair value on a recurring basis.</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: 0; text-align: justify">The fair value of the Company&#8217;s warrant
liabilities (refer to Note 8) is based on the Black-Scholes option pricing model which is based on Level 3 unobservable inputs
for which there is little or no market data, requiring the Company to develop its own assumptions. The assumptions used by the
Company are the quoted price of the Company&#8217;s common stock in an active market, risk-free interest rate, volatility and expected
life, and assumes no dividends. Volatility is based on the actual market activity of the Company&#8217;s stock. The expected life
is based on the remaining contractual term of the warrants and the risk-free interest rate is based on the implied yield available
on U.S. Treasury Securities with a maturity equivalent to the warrants&#8217; expected life. The fair value on a recurring basis
as of January 31, 2021 and April 30, 2020 was near zero.</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: 0; text-align: justify">Unrealized gains of approximately zero for
the three months ended January 31, 2021 and 2020, respectively, and zero and $6,000 for the nine months ended January 31, 2021
and 2020, respectively, were included within &#8220;Gain due to change in fair value of warrant liabilities&#8221; in the Consolidated
Statements of Operations. The Company determined the fair value using the Black-Scholes option pricing model with the following
assumptions:</p>

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

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    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td style="width: 1%">&#160;</td>
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    <td><font style="font: 10pt Times New Roman, Times, Serif">Expected life (years)</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">0.5 - 0.8</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">1.3 - 1.4</font></td>
    <td>&#160;</td></tr>
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    <td><font style="font: 10pt Times New Roman, Times, Serif">Expected volatility</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">146.1</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">%</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">109.8% - 130.1</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">%</font></td></tr>
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<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: 0; text-align: justify">Besides the unrealized gain in fair value,
there was no other activity to the balances in warrant liabilities during the nine months ended January 31, 2021 and 2020, respectively.</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: 0; text-align: justify">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 nine months ended January 31, 2021 and 2020.</p><span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 820<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=117815213&amp;loc=d3e19207-110258<br></p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801032803384">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Commitments and Contingencies<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingenciesDisclosureAbstract', window );"><strong>Commitments and Contingencies Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock', window );">Commitments and Contingencies</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(16) Commitments and Contingencies</b></p>

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

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

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On June 10, 2014, the Company announced that
it had terminated Charles Dunleavy as its Chief Executive Officer and as an employee of the Company for cause, effective June 9,
2014, and that Mr. Dunleavy had also been removed from his position as Chairman of the Board of Directors. On June 17, 2014, Mr.
Dunleavy wrote to the Company stating that he had retained counsel to represent him in connection with an alleged wrongful termination
of his employment. On July 28, 2014, Mr. Dunleavy resigned from the Board and the boards of directors of the Company&#8217;s subsidiaries.</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white">On August 28, 2018,
counsel for Mr. Dunleavy filed a demand for arbitration, captioned&#160;<i>Charles F. Dunleavy v. Ocean Power Technologies, Inc.,</i>&#160;Case
No. 01-18-0003-2374, before the American Arbitration Association in New Jersey. The demand names Ocean Power Technologies, Inc.
as the respondent and alleges various claims and seeks declaratory relief and permanent injunction. The demand seeks damages in
the amount of&#160;$5.0&#160;million for compensatory and punitive damages, plus interest and attorneys&#8217; fees as well as
certain equitable relief. On November 8, 2018, the Company through counsel responded to the demand for arbitration, denied all
allegations, and asserted various affirmative defenses. The final day of hearing occurred in Princeton, New Jersey on July 15,
2020. Post-hearing briefs were filed on September 22, 2020. On December 10, 2020, the panel issued an interim award that, by its
express terms, is not a final award, is strictly confidential, and shall not be publicly disclosed. The parties are considering
next steps. As of January 31, 2021, the Company has not accrued any provision related to this matter since any possible loss cannot
be reasonably estimated. Depending on the nature of the loss, the Company believes it may be covered by insurance.</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><i>Nasdaq Delisting Notification</i></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: 0; text-align: justify">On March 3, 2020, the Company received a notification
from the Nasdaq indicating that the minimum bid price of the Company&#8217;s common stock&#160;had&#160;been below $1.00 per share
for 30 consecutive business days and as a result, the Company&#160;was&#160;not in compliance with the minimum bid price requirement
for continued listing. The Nasdaq notice&#160;had&#160;no immediate effect on the listing or trading of the Company&#8217;s common
stock. Under the Nasdaq Listing Rules, the Company&#160;had&#160;a grace period of 180 calendar days, or until August 31, 2020,
in which to regain compliance with the minimum bid price rule. To regain compliance, the closing bid price of the Company&#8217;s
common stock must meet or exceed $1.00 per share for a minimum of ten consecutive business days during this grace period. On August
21, 2020, the Company received notification from Nasdaq that, as a result of the closing bid price of the Company&#8217;s common
stock being over $1.00 for 10 consecutive trading days, the Company&#160;had&#160;regained compliance with Listing Rule 5550(a)(2)
to maintain the listing of its common stock on Nasdaq and Nasdaq considers the matter closed.</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: 0; text-align: justify"><i>Spain Income Tax Audit</i></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: 0; text-align: justify">The Company underwent an income tax audit
in Spain for the period from 2011 to 2014, when our Spanish branch was closed. In connection with the tax audit, the Spanish tax
inspector challenged the Company&#8217;s recognition of grant funds received in 2011 to 2014 from the European Commission in connection
with the Company&#8217;s Waveport project. On July 30, 2018, the 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. On August 30, 2018, the Company filed an administrative appeal of the penalty and its underlying conclusions.
During the three months ended July 31, 2020, the Company received notice from the Spanish Central Economic and Administrative
Tribunal that it agreed with the inspector and ruled that the Company owes the full amount of the penalty in the amount of &#8364;279,869.81
or approximately $331,000. In the quarter ended October 31, 2020, the Company recorded an additional reserve of &#8364;117,145.81&#160;(or
approximately $154,000)&#160;to Selling, general and administrative costs in the Statement of Operations making the total reserve
&#8364;279,869.81, which amount was paid by the Company to the Spanish Tax Administration on January 25, 2021. At this time, the
Company plans to continue appealing the decision of the Tribunal tax assessment to the Spanish National Court. As of January 31,&#160;2021,&#160;and
April 30, 2020, the Company has reserved zero and &#8364;162,724 (or approximately $177,000), respectively. The penalty was recorded
in Accrued expenses in the Consolidated Balance Sheets.</p><span></span>
</td>
</tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for commitments and contingencies.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -URI http://asc.fasb.org/topic&amp;trid=2127136<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 440<br> -URI http://asc.fasb.org/topic&amp;trid=2144648<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 440<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121559207&amp;loc=d3e25336-109308<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 (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121559207&amp;loc=d3e25336-109308<br></p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801027404296">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Income Taxes<br></strong></div></th>
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<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(17) Income Taxes</b></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: 0; text-align: justify"><i>Uncertain Tax Positions</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: 0; text-align: justify">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, as discussed above.
At January 31, 2021, the Company had no other unrecognized tax positions. The Company does not expect any material increase or
decrease in its income tax expense in the next twelve months, related to examinations or uncertain tax positions. U.S. federal
and state income tax returns were audited through fiscal 2014 and fiscal 2010 respectively. Net operating loss and credit carry
forwards since inception remain open to examination by taxing authorities and will continue to remain open for a period of time
after utilization.</p><span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.</p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801029336024">
<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="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SegmentReportingAbstract', window );"><strong>Segment Reporting [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(18) Operating Segments and Geographic Information</b></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company&#8217;s business consists of one
segment as this represents management&#8217;s view of the Company&#8217;s operations. The Company operates on a worldwide basis
with one operating company in the US and subsidiaries in the UK and in Australia. Revenues and expenses are generally attributed
to the operating unit that bills the customers. During each of the nine months ended January 31, 2021 and 2020, the Company&#8217;s
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 31<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&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 34<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8981-108599<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 21<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8721-108599<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 40<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e9031-108599<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (f)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8933-108599<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (e)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8933-108599<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 26<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8844-108599<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 41<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e9038-108599<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8933-108599<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8736-108599<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 42<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e9054-108599<br><br>Reference 12: 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 15<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8657-108599<br><br>Reference 13: 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 21<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8721-108599<br><br>Reference 14: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -URI http://asc.fasb.org/topic&amp;trid=2134510<br></p></div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801029074328">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Subsequent Events<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white"><b>(19) Subsequent
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">On February 1, 2021, the Company entered into
a unit purchase agreement (the &#8220;3dent Agreement&#8221;), pursuant to which the Company acquired all of the outstanding equity
interest of 3dent Technology, LLC&#160;(&#8220;3dent&#8221;),&#160;a Houston, Texas based company that offers offshore energy engineering
and design services that are complementary to OPT&#8217;s technology and products. In consideration for the purchase, the Company
issued 361,991 shares of its common stock to the sellers with an agreed value of $800,000 based on the closing price of the Company&#8217;s
common stock on the date that the Company agreed to terms with 3dent. In&#160;addition,&#160;the former owners of 3dent will be
eligible for awards of performance stock with a potential value of $360,000 if certain revenue targets are achieved over the next
12 months. The 3dent Agreement includes a number of other standard representations, warranties, covenants and indemnifications.</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: 0; text-align: justify">The Company is accounting for the transaction
as a business combination under ASC 805,&#160;<i>&#8220;Business Combinations.&#8221;&#160;</i>Accordingly, the assets acquired
and the liabilities assumed will be recorded at their estimated fair value on the date of acquisition. Goodwill from the acquisition
principally relates to excess value of the purchase price over the fair value of identified net assets and liabilities. Under
ASC 805, acquisition-related transaction costs (such as advisory, legal, valuation, other professional fees) have been expensed
in the statement of operations in the period incurred.</p><span></span>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801111419336">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies (Policies)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountingPoliciesAbstract', window );"><strong>Accounting Policies [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConsolidationPolicyTextBlock', window );">Consolidation</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(a) Consolidation</i></b></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: 0; text-align: justify">The accompanying consolidated financial statements
include the accounts of the Company and its majority-owned subsidiaries. All significant intercompany balances and transactions
have been eliminated in consolidation.</p><span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_UseOfEstimates', window );">Use of Estimates</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(b) Use of Estimates</i></b></p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white">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 and the disclosure of contingent 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 estimated costs to complete projects; and the input method used to measure completion over time of customer
contracts for purposes of revenue recognition. Actual results could differ from those estimates.</p><span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy', window );">Cash, Cash Equivalents, Restricted Cash and Security Agreements</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(c) Cash, Cash Equivalents, Restricted
Cash and Security Agreements</i></b></p>

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

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

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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<tr style="vertical-align: bottom">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><i>Restricted Cash and Security Agreements</i></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: 0; text-align: justify">The Company has two agreements with Santander&#160;Bank,
N.A. (&#8220;Santander&#8221;).&#160;Cash 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&#160;cancellable&#160;at the discretion of the bank. Santander also issued two letters of credit to subsidiaries of Enel
Green Power (&#8220;EGP&#8221;) pursuant to the Company&#8217;s contracts with EGP. The first letter of credit was issued in the
amount of $125,690 that expires in May 2021. The second letter of credit was issued in the amount of $645,467 and reduced to $322,734
in August 2020.&#160;The&#160;second letter of credit&#160;will be&#160;reduced to $64,547&#160;once the PB3 PowerBuoy<sup>&#174;</sup>&#160;is
fully deployed and passes final acceptance testing .&#160;The remaining amount expires in December 2021.</p>

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

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

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    <td style="width: 1%">&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><b><i>&#160;</i></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The following table provides a reconciliation
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same such amounts shown in the Statement of Cash Flows.</p>

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

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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
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    <td>&#160;</td>
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    <td style="width: 2%">&#160;</td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"></p><span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskCreditRisk', window );">Concentration of Credit Risk</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(d) Concentration of Credit Risk</i></b></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Financial instruments that potentially subject
the Company to credit risk consist principally of accounts receivable and cash and cash equivalents. The Company believes that
its credit risk is limited because the Company&#8217;s current contracts are with companies with strong financial strength. The
Company invests its excess cash in a money market account and does not believe that it is exposed to any significant risks related
to its cash and money market accounts. Cash and cash equivalents are also maintained at foreign financial institutions. Cash and
cash equivalents in foreign financial institutions as of January 31, 2021 was $0.3 million.</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: 0; text-align: justify">The table below shows the percentage of the
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for at least one of the periods indicated:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
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    <td>&#160;</td>
    <td>&#160;</td>
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</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy', window );">Share-Based Compensation</a></td>
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</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white"></p><span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock', window );">Revenue Recognition</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b>(f)&#160;<i>Revenue Recognition</i></b></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: 0; text-align: justify">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.</p>

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The nature of the Company&#8217;s contracts
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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. Accounting Standards Update (&#8220;ASU&#8221;)
2016-10 provides a practical expedient that permits presentation of shipping and handling costs, that occur after control of the
promised goods or services transfer to the customer, as fulfillment costs rather than evaluating whether the shipping and handling
activities are promised services to the customer. The Company adopted this practical expedient, but it did not have a material
effect on its Consolidated Financial Statements.</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: 0; text-align: justify">The Company recognizes revenue when or as it
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A good or service is transferred when or as the customer obtains control of it. The evaluation of whether control of each performance
obligation is transferred at a point in time or over time is made at contract inception. Input measures such as costs incurred
or time elapsed are utilized to assess progress against specific contractual performance obligations for the Company&#8217;s services.
The selection of the method to measure progress towards completion requires judgment and is based on the nature of the services
to be provided. For the Company, the input method using costs incurred or time elapsed best represents the measure of progress
against the performance obligations incorporated within the contractual agreements. When the Company&#8217;s estimate of total
costs to be incurred to satisfy the performance obligations exceed revenue, the Company recognizes the loss immediately.</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: 0; text-align: justify">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.</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: 0; text-align: justify">The Company has two types of fixed price contracts,
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and services specified in the contract, a profit or loss is recognized depending on whether actual costs are more or less than
the agreed upon amount. Under cost-sharing contracts, the fixed amount agreed upon with the customer is only intended to fund a
portion of the costs on a specific project. Under cost sharing contracts, an amount corresponding to the revenue is recorded in
cost of revenues, resulting in gross profit on these contracts of zero. The Company&#8217;s share of the costs is recorded as product
development expense. The Company reports its disaggregation of revenue by contract type since this method best represents the Company&#8217;s
business. For the nine-month periods ended January 31, 2021 and 2020, all of the Company&#8217;s contracts were classified as firm
fixed price.</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: 0; text-align: justify">As of January 31, 2021, the Company&#8217;s
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<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: 0; text-align: justify"><i>Products and Solutions Leasing</i></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: 0; text-align: justify">The Company enters into lease arrangements
with certain customers for their products and solutions. As of January 31, 2021, the Company has one lease arrangement with a remaining
operating lease term of less than 10 months. Revenue related to multiple-element arrangements is allocated to lease and non-lease
elements based on their relative standalone selling prices or expected cost plus a margin approach. Lease elements generally include
a PB3 PowerBuoy<sup>&#174;</sup>&#160;<i>(&#8220;</i>PB3&#8221;) 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.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company classifies leases as either operating
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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.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">The Company recognizes revenue from
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</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EarningsPerSharePolicyTextBlock', window );">Net Loss Per Common Share</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(g) Net Loss per Common Share</i></b></p>

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

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

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

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">In computing diluted net loss per share on
the Consolidated Statement of Operations, warrants on common stock, options to purchase shares of common stock and non-vested
restricted stock issued to employees and non-employee directors, totaling 5,221,258 and 5,565,462 for the three and nine months
ended January 31, 2021 and 2020, respectively, were excluded from each of the computations as the effect would be anti-dilutive
due to the Company&#8217;s net losses.</p><span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock', window );">Recently Issued Accounting Standards</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><b><i>(h) Recently Issued Accounting Standards</i></b></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: 0; text-align: justify">In June 2016, the Financial Accounting Standards
Board (&#8220;FASB&#8221;) issued ASU No. 2016-13, &#8220;<i>Financial Instruments&#160;</i>-&#160;<i>Credit Losses (Topic 326),
Measurement of Credit Losses on Financial Instruments.&#8221;&#160;</i>The amendment in this update 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,&#160;<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.</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: 0; text-align: justify">In August 2018, the FASB issued ASU No. 2018-13,&#160;<i>&#8220;Fair
Value Measurement (Topic 820).&#8221;&#160;</i>The ASU modifies, removes, and adds several disclosure requirements on fair value
measurements in Topic 820, Fair Value Measurement. The amendments on changes in unrealized gains and losses, the range and weighted
average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement
uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year
of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The Company
adopted this guidance effective May 1, 2020. The adoption of the guidance did not have a material effect on its Consolidated Financial
Statements.</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: 0; text-align: justify">In August 2018, the FASB issued ASU No. 2018-15,
&#8220;<i>Intangibles&#160;</i>&#8212;&#160;<i>Goodwill and Other&#160;</i>&#8212;&#160;<i>Internal-Use Software (Subtopic 350-40):
Customer&#8217;s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.&#8221;</i>&#160;The
ASU requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance
in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. The ASU
permits two methods of adoption: prospectively to all implementation costs incurred after the date of adoption, or retrospectively
to each prior reporting period presented. The Company adopted this guidance on a prospective basis effective May 1, 2020. The
adoption of the guidance did not have a material effect on its Consolidated Financial Statements.</p><span></span>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Entity's cash and cash equivalents accounting policy with respect to restricted balances.  Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for credit risk.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e5967-108592<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 825<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=108315417&amp;loc=d3e61044-112788<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting.  The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for revenue from contract with customer.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for award under share-based payment arrangement. Includes, but is not limited to, methodology and assumption used in measuring cost.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 275<br> -SubTopic 10<br> -Section 50<br> -Paragraph 12<br> -URI http://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 http://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 http://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 http://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 http://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 http://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 http://asc.fasb.org/extlink&amp;oid=99393423&amp;loc=d3e5967-108592<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801027971720">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock', window );">Schedule of Cash and Cash Equivalents</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">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.</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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<tr style="vertical-align: bottom">
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    <td style="width: 15%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">2,597</font></td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 1%">&#160;</td>
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    <td>&#160;</td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><b></b></p><span></span>
</td>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock', window );">Schedule of Cash and Cash Equivalents and Restricted Cash</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The following table provides a reconciliation
of cash, cash equivalents and restricted cash reported within the Statement of Financial Position that sum to the total of the
same such amounts shown in the Statement of Cash Flows.</p>

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

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    <td>&#160;</td>
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    <td style="width: 15%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">79,801</font></td>
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    <td>&#160;</td></tr>
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td>&#160;</td>
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    <td style="border-bottom: black 2.25pt double; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">80,407</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td style="border-bottom: black 2.25pt double; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">10,930</font></td>
    <td>&#160;</td></tr>
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</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfRevenueByMajorCustomersByReportingSegmentsTableTextBlock', window );">Schedule of Revenue by Major Customers by Reporting Segments</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The table below shows the percentage of the
Company&#8217;s revenues derived from customers whose revenues accounted for at least 10% of the Company&#8217;s consolidated revenues
for at least one of the periods indicated:</p>

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

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<tr style="vertical-align: bottom; background-color: white">
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</td>
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<tr class="ro">
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<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; background-color: white">The following table
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months ended January 31, 2021 and 2020:</p>

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

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</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white"></p><span></span>
</td>
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<tr class="rh">
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<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock', window );">Schedule of Cash and Cash Equivalents and Restricted Cash</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Restricted cash includes the following:</p>

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

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    <td>&#160;</td>
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<tr style="vertical-align: bottom">
    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
    <td style="width: 63%">&#160;</td>
    <td style="width: 2%">&#160;</td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 15%; text-align: right">&#160;</td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 15%; text-align: right">&#160;</td>
    <td style="width: 1%">&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td>&#160;</td>
    <td style="border-bottom: black 1.5pt solid">&#160;</td>
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    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
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</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><b><i></i></b></p><span></span>
</td>
</tr>
</table>
<div style="display: none;">
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the components of cash and cash equivalents.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(1)(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121583591&amp;loc=SL98516268-108586<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)(2))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801027779720">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Account Receivable, Contract Assets, and Contract Liabilities (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract', window );"><strong>Account Receivable Contract Assets And Contract Liabilities</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock', window );">Schedule of Accounts Receivable, Contract Assets and Contract Liabilities</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The following provides further details on the
balance sheet accounts of accounts receivable, contract assets, and contract liabilities from contracts with customers:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td style="width: 2%">&#160;</td>
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    <td style="width: 15%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">-</font></td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
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    <td style="width: 1%">&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
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</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p><span></span>
</td>
</tr>
<tr class="re">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td style="width: 77%"><font style="font: 10pt Times New Roman, Times, Serif">Transferred to receivables from contract assets recognized at the beginning of the period</font></td>
    <td style="width: 2%">&#160;</td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="width: 19%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(251</font></td>
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
    <td style="border-bottom: black 1.5pt solid">&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td>&#160;</td>
    <td style="border-bottom: black 2.25pt double"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="border-bottom: black 2.25pt double; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(188</font></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><i>&#160;</i></p>

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

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

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>January 31, 2021</b></font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">(in thousands)</font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2">&#160;</td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td style="width: 77%"><font style="font: 10pt Times New Roman, Times, Serif">Revenue recognized that was included in the contract liabilities balance as of the beginning of the period</font></td>
    <td style="width: 2%">&#160;</td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="width: 19%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(84</font></td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">)</font></td></tr>
<tr style="vertical-align: bottom; background-color: white">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Transferred to contract assets from contract liabilities recognized at the beginning of the period</font></td>
    <td>&#160;</td>
    <td style="border-bottom: black 1.5pt solid">&#160;</td>
    <td style="border-bottom: black 1.5pt solid; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(6</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">)</font></td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Net change in contract liabilities</font></td>
    <td>&#160;</td>
    <td style="border-bottom: black 2.25pt double"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="border-bottom: black 2.25pt double; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(90</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">)</font></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p><span></span>
</td>
</tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Schedule of Accounts Receivable,Contract Assets , And Contract Liabilities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>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="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 10<br> -URI http://asc.fasb.org/extlink&amp;oid=121604090&amp;loc=SL49130551-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock</td>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801033189592">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Other Current Assets (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract', window );"><strong>Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock', window );">Schedule of Other Current Assets</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">Other current assets consist of the following
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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<tr style="vertical-align: bottom">
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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
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    <td>&#160;</td>
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<a href="javascript:void(0);" onclick="top.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="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801032985240">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Property and Equipment, net (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentAbstract', window );"><strong>Property, Plant and Equipment [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentTextBlock', window );">Schedule of Components of Property and Equipment</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The components of property and equipment, net
as of January 31, 2021 and April 30, 2020 consisted of the following:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom">
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
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    <td style="border-bottom: black 1.5pt solid; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">(1,255</font></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.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="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(13))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentTextBlock</td>
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<DOCUMENT>
<TYPE>XML
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<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;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801027858600">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeasesAbstract', window );"><strong>Leases [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeaseCostTableTextBlock', window );">Schedule of Operating Lease Costs</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: justify">The components of lease expense
in the Consolidated Statement of Operations for both the three and nine months ended January 31, 2021 and 2020 was as follows:</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2.15pt; text-align: center">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
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    <td style="border-bottom: black 1.5pt solid">&#160;</td>
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    <td style="border-bottom: black 2.25pt double; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">86</font></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify"></p><span></span>
</td>
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<tr class="re">
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<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">Information related to the Company&#8217;s
right-of use assets and lease liabilities as of January 31, 2021 was as follows:</p>

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

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    <td>&#160;</td></tr>
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<tr style="vertical-align: bottom">
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    <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: white">
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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<tr style="vertical-align: bottom; background-color: white">
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td>&#160;</td>
    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock', window );">Schedule of Future Minimum Lease Payments Under Operating Lease</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 2pt; text-align: justify">Total remaining lease payments under
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
    <td style="border-bottom: black 2.25pt double"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="border-bottom: black 2.25pt double; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">1,139</font></td>
    <td>&#160;</td></tr>
</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"><b></b></p><span></span>
</td>
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<a href="javascript:void(0);" onclick="top.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="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>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="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LeaseCostTableTextBlock</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LeasesAbstract</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 840<br> -SubTopic 20<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=121573735&amp;loc=d3e41502-112717<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801032861672">
<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">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PayablesAndAccrualsAbstract', window );"><strong>Payables and Accruals [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock', window );">Schedule of Accrued Expenses</a></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
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    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the components of accrued liabilities.</p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801028999192">
<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">9 Months Ended</th>
</tr>
<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock', window );">Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The following assumptions were used to value
the awards:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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<tr style="vertical-align: bottom">
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    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
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    <td colspan="2" style="text-align: center">&#160;</td>
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    <td style="width: 2%">&#160;</td>
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    <td style="width: 1%">&#160;</td>
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    <td style="width: 1%">&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0"></p><span></span>
</td>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock', window );">Schedule of Stock Option Activity</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">A summary of stock options under our stock
incentive plans is detailed in the following table.</p>

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

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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>Price</b></font></td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td style="width: 2%">&#160;</td>
    <td style="width: 1%">&#160;</td>
    <td style="width: 12%; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">474,128</font></td>
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    <td style="width: 2%">&#160;</td>
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    <td style="width: 1%">&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right">&#160;</td>
    <td>&#160;</td></tr>
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
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    <td><font style="font: 10pt Times New Roman, Times, Serif">Exercisable as of January 31, 2021</font></td>
    <td>&#160;</td>
    <td style="border-bottom: black 2.25pt double">&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></p><span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock', window );">Schedule of Non-vested Restricted Stock Activity</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">A summary of non-vested restricted stock under
our stock incentive plans is as follows:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
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    <td colspan="2">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2">&#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: #CCEEFF">
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<tr style="vertical-align: bottom; background-color: white">
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    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">-</font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
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</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p><span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember', window );">Performance Stock Options [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock', window );">Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The Company determined these awards contain
a market- based condition and estimated the fair value using the Monte Carlo simulation model with the following assumptions:</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom">
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<tr style="vertical-align: bottom">
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    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td style="width: 1%">&#160;</td>
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    <td style="width: 1%">&#160;</td>
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    <td style="width: 1%">&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Expected dividend yield</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td><font style="font: 10pt Times New Roman, Times, Serif">%</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td><font style="font: 10pt Times New Roman, Times, Serif">%</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
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</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></p><span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock', window );">Schedule of Stock Option Activity</a></td>
<td class="text"><p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">A summary of performance stock options under
our stock incentive plans is detailed in the following table.</p>

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

<table cellspacing="0" cellpadding="0" style="font: 11pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>Weighted</b></font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center">&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>Average</b></font></td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif"><b>Price</b></font></td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
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    <td style="width: 2%">&#160;</td>
    <td style="width: 1%">&#160;</td>
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    <td style="width: 2%">&#160;</td>
    <td style="width: 1%"><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
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    <td style="width: 1%">&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right">&#160;</td>
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<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Exercised</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">-</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">-</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right">&#160;</td>
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<tr style="vertical-align: bottom; background-color: white">
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    <td>&#160;</td>
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    <td style="border-bottom: black 1.5pt solid; text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">-</font></td>
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    <td><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">-</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td>&#160;</td>
    <td style="text-align: right">&#160;</td>
    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: #CCEEFF">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Outstanding as of January 31, 2021</font></td>
    <td>&#160;</td>
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    <td>&#160;</td>
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    <td><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">2.57</font></td>
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    <td>&#160;</td>
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    <td>&#160;</td></tr>
<tr style="vertical-align: bottom; background-color: white">
    <td><font style="font: 10pt Times New Roman, Times, Serif">Exercisable as of January 31, 2021</font></td>
    <td>&#160;</td>
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    <td>&#160;</td>
    <td>&#160;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">$</font></td>
    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">1.05</font></td>
    <td>&#160;</td>
    <td>&#160;</td>
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    <td style="text-align: right"><font style="font: 10pt Times New Roman, Times, Serif">9.0</font></td>
    <td>&#160;</td></tr>
</table>
<p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></p><span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (d)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>nonnum:textBlockItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Fair Value Measurements (Tables)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
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<tr><th class="th"><div>Jan. 31, 2021</div></th></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022659576">
<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">9 Months Ended</th>
<th class="th" colspan="1">12 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Dec. 23, 2020</div></th>
<th class="th"><div>Nov. 20, 2020</div></th>
<th class="th"><div>Sep. 18, 2020</div></th>
<th class="th"><div>Oct. 24, 2019</div></th>
<th class="th"><div>Jan. 07, 2019</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Apr. 30, 2020</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="top.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>
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<td class="text">&#160;<span></span>
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<td class="num">$ (229,696)<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="num">$ (220,136)<span></span>
</td>
</tr>
<tr class="ro">
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(8,525)<span></span>
</td>
<td class="num">$ (8,631)<span></span>
</td>
<td class="nump">10,500<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Unrestricted cash and cash equivalents</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">$ 79,801<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,002<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandNinteenATMFacilityMember', window );">2019 ATM Facility [Member] | 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>
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<tr class="re">
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<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>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">17,595,472<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="nump">$ 23,400<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.33<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PaymentOfSalesCommission', window );">Payment of sales commission</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 800<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember', window );">2020 ATM Facility [Member] | 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>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ProceedsFromInitialPublicOffering', window );">Aggregate offering price</a></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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="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="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="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="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="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="top.Show.showAR( this, 'defref_OPTT_PaymentOfSalesCommission', window );">Payment of sales commission</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="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="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember', window );">Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">6,424,205<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,250,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 4,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 7,400<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.63<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 3.28<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_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="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>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval', window );">Percentage of outstanding common stock limit for shareholder approval</a></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>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage', window );">Number of 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="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>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval', window );">Number of additional shares that can be issued upon shareholder approval</a></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>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember', window );">Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member] | Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee', window );">Aggregate purchase of common stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of additional shares that can be issued upon shareholder approval.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PaymentOfSalesCommission">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Payment of sales commission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PaymentOfSalesCommission</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Percentage of outstanding common stock limit for shareholder approval.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ProceedsFromInitialPublicOffering">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received from entity's first offering of stock to the public.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ProceedsFromInitialPublicOffering</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares can be issued based upon outstanding percentage.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate purchase of common stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_NetCashProvidedByUsedInOperatingActivities">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 25<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3536-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3521-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NetCashProvidedByUsedInOperatingActivities</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RetainedEarningsAccumulatedDeficit">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cumulative amount of the reporting entity's undistributed earnings or deficit.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(30)(a)(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 65<br> -Paragraph 15<br> -Subparagraph (g)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=121322162&amp;loc=SL121327923-165333<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(23)(a)(4))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 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 http://asc.fasb.org/extlink&amp;oid=121370832&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 http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 40<br> -Section 65<br> -Paragraph 2<br> -Subparagraph (g)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=121370832&amp;loc=SL117420844-207641<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RetainedEarningsAccumulatedDeficit</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockConsiderationReceivedPerTransaction</td>
</tr>
<tr>
<td style="padding-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>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction</td>
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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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<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_SaleOfStockPricePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockPricePerShare</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td>num:perShareItemType</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>instant</td>
</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandNinteenATMFacilityMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandNinteenATMFacilityMember</td>
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<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>
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<td><strong> Period Type:</strong></td>
<td></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LegalEntityAxis=OPTT_AGPAllianceGlobalPartnersMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=OPTT_AGPAllianceGlobalPartnersMember</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>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember</td>
</tr>
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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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<td><strong> Period Type:</strong></td>
<td></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember</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>
</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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=OPTT_AspireCapitalFundLLCMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<td><strong> Period Type:</strong></td>
<td></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MaximumMember</td>
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<td></td>
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<td>na</td>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022364680">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Aug. 31, 2020</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 79,801,000<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 79,801,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,002,000<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueRemainingPerformanceObligation', window );">Revenue remaining performance obligation</a></td>
<td class="nump">500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_RevenueRemainingPerformancesObligationPercentage', window );">Revenue remaining performance obligation, percentage</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">89.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths', window );">Performance obligation revenue of next twelve months</a></td>
<td class="nump">$ 400,000<span></span>
</td>
<td class="text">&#160;<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>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount', window );">Antidilutive securities excluded from computation of earnings per share, shares</a></td>
<td class="nump">5,221,258<span></span>
</td>
<td class="nump">5,565,462<span></span>
</td>
<td class="nump">5,221,258<span></span>
</td>
<td class="nump">5,565,462<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_SantanderBankMember', window );">Santander Bank, N.A. [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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_LettersOfCreditIssuedAmount', window );">Letters of credit issued, amount</a></td>
<td class="nump">$ 64,547<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 64,547<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_SantanderBankMember', window );">Santander Bank, N.A. [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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LettersOfCreditOutstandingAmount', window );">Letters of credit outstanding, amount</a></td>
<td class="text">&#160;<span></span>
</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">$ 322,734<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">300,000<span></span>
</td>
<td class="text">&#160;<span></span>
</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="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_RestrictedCashAndSecurityAgreementsMember', window );">Restricted Cash and Security Agreements [Member] | Santander Bank, N.A. [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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LettersOfCreditOutstandingAmount', window );">Letters of credit outstanding, amount</a></td>
<td class="nump">125,690<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 125,690<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LineOfCreditFacilityExpirationDate1', window );">Line of credit expiration period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">May 31,  2021<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_RestrictedCashAndSecurityAgreementsMember', window );">Restricted Cash and Security Agreements [Member] | Santander Bank, N.A. [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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LettersOfCreditOutstandingAmount', window );">Letters of credit outstanding, amount</a></td>
<td class="nump">$ 645,467<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 645,467<span></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_ContractReceivablesDueAfterNextRollingTwelveMonths">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount billed to customers under long-term contracts or programs to be collected after the next rolling twelve months following the latest balance sheet. Excludes amounts due that have been withheld because of retainage provisions in a contract. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ContractReceivablesDueAfterNextRollingTwelveMonths</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_LettersOfCreditIssuedAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Letters of credit issued, amount.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_LettersOfCreditIssuedAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_RevenueRemainingPerformancesObligationPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_RevenueRemainingPerformancesObligationPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 260<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=6371337&amp;loc=d3e3550-109257<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LettersOfCreditOutstandingAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LettersOfCreditOutstandingAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LineOfCreditFacilityExpirationDate1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Date the credit facility terminates, in CCYY-MM-DD format.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://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 http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LineOfCreditFacilityExpirationDate1</td>
</tr>
<tr>
<td style="padding-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_RevenueRemainingPerformanceObligation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of transaction price allocated to performance obligation that has not been recognized as revenue.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 13<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121604090&amp;loc=SL49130556-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RevenueRemainingPerformanceObligation</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_SantanderBankMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_SantanderBankMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShortTermDebtTypeAxis=OPTT_LetterTwoMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShortTermDebtTypeAxis=OPTT_LetterTwoMember</td>
</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_AwardDateAxis=OPTT_AugustTwentyTwentyMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardDateAxis=OPTT_AugustTwentyTwentyMember</td>
</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_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_ForeignFinancialInstitutionsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=OPTT_ForeignFinancialInstitutionsMember</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>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_RestrictedCashAndSecurityAgreementsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<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_ShortTermDebtTypeAxis=OPTT_LetterOneMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShortTermDebtTypeAxis=OPTT_LetterOneMember</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>
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<DOCUMENT>
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<SEQUENCE>49
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<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801025089592">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 79,801<span></span>
</td>
<td class="nump">$ 10,002<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAxis=OPTT_CheckingAndSavingsAccountsMember', window );">Checking and Savings Accounts [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">2,597<span></span>
</td>
<td class="nump">1,551<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAxis=OPTT_MoneyMarketAccountMember', window );">Money Market Account [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and cash equivalents</a></td>
<td class="nump">$ 77,204<span></span>
</td>
<td class="nump">$ 8,451<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_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAxis=OPTT_CheckingAndSavingsAccountsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAxis=OPTT_CheckingAndSavingsAccountsMember</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_CashAndCashEquivalentsAxis=OPTT_MoneyMarketAccountMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAxis=OPTT_MoneyMarketAccountMember</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>
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</div></td></tr>
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<DOCUMENT>
<TYPE>XML
<SEQUENCE>50
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<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022589272">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCash', window );">Restricted Cash</a></td>
<td class="nump">$ 606<span></span>
</td>
<td class="nump">$ 928<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashAndCashEquivalentsAtCarryingValue', window );">Cash and Cash Equivalents</a></td>
<td class="nump">79,801<span></span>
</td>
<td class="nump">10,002<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCashCurrent', window );">Restricted cash- short term</a></td>
<td class="nump">384<span></span>
</td>
<td class="nump">707<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCashNoncurrent', window );">Restricted cash- long term</a></td>
<td class="nump">222<span></span>
</td>
<td class="nump">221<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents', window );">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents</a></td>
<td class="nump">80,407<span></span>
</td>
<td class="nump">10,930<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=OPTT_SantanderBankMember', window );">Santander Bank, N.A. [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RestrictedCash', window );">Restricted Cash</a></td>
<td class="nump">$ 606<span></span>
</td>
<td class="nump">$ 928<span></span>
</td>
</tr>
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<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashAndCashEquivalentsAtCarryingValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3044-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CashAndCashEquivalentsAtCarryingValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 24<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3521-108585<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3044-108585<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121583591&amp;loc=SL98516268-108586<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<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>
</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_RestrictedCash">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121583591&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 942<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-03(1)(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<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)(2))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedCash</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RestrictedCashCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121583591&amp;loc=SL98516268-108586<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedCashCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
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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_RestrictedCashNoncurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6812-107765<br><br>Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(17))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121583591&amp;loc=SL98516268-108586<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 954<br> -SubTopic 210<br> -Section 45<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=120413173&amp;loc=SL116631458-115580<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedCashNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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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>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=OPTT_SantanderBankMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
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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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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022293912">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies - Schedule of Revenue by Major Customers by Reporting Segments (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="nump">$ 317<span></span>
</td>
<td class="nump">$ 725<span></span>
</td>
<td class="nump">$ 604<span></span>
</td>
<td class="nump">$ 1,131<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Eni S.P.A [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="nump">34<span></span>
</td>
<td class="nump">42<span></span>
</td>
<td class="nump">135<span></span>
</td>
<td class="nump">118<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Premier Oil UK Limited [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">5<span></span>
</td>
<td class="nump">27<span></span>
</td>
<td class="nump">126<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | EGP [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="nump">223<span></span>
</td>
<td class="nump">678<span></span>
</td>
<td class="nump">379<span></span>
</td>
<td class="nump">774<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | ACET [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="nump">33<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">37<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember', window );">Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Other [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax', window );">Revenues</a></td>
<td class="nump">$ 27<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 26<span></span>
</td>
<td class="nump">$ 113<span></span>
</td>
</tr>
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<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 30<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8906-108599<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 40<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e9031-108599<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 41<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e9038-108599<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8933-108599<br><br>Reference 5: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 32<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8933-108599<br><br>Reference 6: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121604090&amp;loc=SL49130543-203045<br><br>Reference 7: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8736-108599<br><br>Reference 8: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 22<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8736-108599<br><br>Reference 9: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 42<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e9054-108599<br><br>Reference 10: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 5<br> -URI http://asc.fasb.org/extlink&amp;oid=121604090&amp;loc=SL49130545-203045<br><br>Reference 11: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 924<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 11.L)<br> -URI http://asc.fasb.org/extlink&amp;oid=6472922&amp;loc=d3e499488-122856<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember</td>
</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_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_EniSPAMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_EniSPAMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_PremierOilUKLimitedMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_PremierOilUKLimitedMember</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_srt_MajorCustomersAxis=OPTT_EGPMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_EGPMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_ACETMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_ACETMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_MajorCustomersAxis=OPTT_OtherMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_MajorCustomersAxis=OPTT_OtherMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>52
<FILENAME>R41.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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</head>
<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022622728">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Summary of Significant Accounting Policies - Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Total share-based compensation expense</a></td>
<td class="nump">$ 115<span></span>
</td>
<td class="nump">$ 56<span></span>
</td>
<td class="nump">$ 338<span></span>
</td>
<td class="nump">$ 225<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=OPTT_EngineeringAndProductDevelopmentMember', window );">Engineering and Product Development [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Total share-based compensation expense</a></td>
<td class="nump">32<span></span>
</td>
<td class="nump">12<span></span>
</td>
<td class="nump">91<span></span>
</td>
<td class="nump">52<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember', window );">Selling, General and Administrative [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensation', window );">Total share-based compensation expense</a></td>
<td class="nump">$ 83<span></span>
</td>
<td class="nump">$ 44<span></span>
</td>
<td class="nump">$ 247<span></span>
</td>
<td class="nump">$ 173<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of noncash expense for share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensation</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeStatementLocationAxis=OPTT_EngineeringAndProductDevelopmentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementLocationAxis=OPTT_EngineeringAndProductDevelopmentMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>53
<FILENAME>R42.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
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</head>
<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801027859160">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Account Receivable, Contract Assets, and Contract Liabilities - Schedule of Accounts Receivable, Contract Assets and Contract Liabilities (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract', 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="top.Show.showAR( this, 'defref_us-gaap_AccountsReceivableNetCurrent', window );">Accounts receivable</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 105<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNetCurrent', window );">Contract assets</a></td>
<td class="nump">63<span></span>
</td>
<td class="nump">251<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiabilityCurrent', window );">Contract liabilities</a></td>
<td class="nump">$ 75<span></span>
</td>
<td class="nump">$ 100<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract</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_AccountsReceivableNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=121593590&amp;loc=d3e4428-111522<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(3))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br><br>Reference 4: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 310<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=121593590&amp;loc=d3e4531-111522<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccountsReceivableNetCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerAssetNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130531-203044<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130533-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121604090&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerAssetNetCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerLiabilityCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130531-203044<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130532-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121604090&amp;loc=SL49130549-203045<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerLiabilityCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>54
<FILENAME>R43.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
							}</script>
</head>
<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801024925672">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Account Receivable, Contract Assets, and Contract Liabilities - Schedule of Significant Changes in Contract assets and Contract Liabilities (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract', 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="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNet', window );">Transferred to receivables from contract assets recognized at the beginning of the period</a></td>
<td class="num">$ (251)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerAssetNet', window );">Revenue recognized and not billed as of the end of the period</a></td>
<td class="nump">63<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerAsset', window );">Net change in contract assets</a></td>
<td class="num">(188)<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="top.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">(84)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ContractWithCustomerLiability', window );">Transferred to contract assets from contract liabilities recognized at the beginning of the period</a></td>
<td class="num">(6)<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncreaseDecreaseInContractWithCustomerLiability', window );">Net change in contract liabilities</a></td>
<td class="nump">$ 90<span></span>
</td>
<td class="num">$ (107)<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract</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_ContractWithCustomerAssetNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 50<br> -Paragraph 8<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121604090&amp;loc=SL49130549-203045<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130531-203044<br><br>Reference 3: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130533-203044<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ContractWithCustomerAssetNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ContractWithCustomerLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 606<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121556615&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 http://asc.fasb.org/extlink&amp;oid=121604090&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 http://asc.fasb.org/extlink&amp;oid=121556615&amp;loc=SL49130532-203044<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_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_IncreaseDecreaseInContractWithCustomerAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncreaseDecreaseInContractWithCustomerAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncreaseDecreaseInContractWithCustomerLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_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>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801024925672">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Other Current Assets - Schedule of Other Current Assets (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract', window );"><strong>Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DepositsAssetsCurrent', window );">Deposits</a></td>
<td class="nump">$ 126<span></span>
</td>
<td class="nump">$ 60<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherReceivablesNetCurrent', window );">Other receivables</a></td>
<td class="nump">244<span></span>
</td>
<td class="nump">2<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PrepaidInsurance', window );">Prepaid insurance</a></td>
<td class="nump">411<span></span>
</td>
<td class="nump">124<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PrepaidOfferingCosts', window );">Prepaid offering costs</a></td>
<td class="nump">56<span></span>
</td>
<td class="nump">275<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherPrepaidExpenseCurrent', window );">Prepaid expenses- other</a></td>
<td class="nump">164<span></span>
</td>
<td class="nump">127<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAssetsCurrent', window );">Other current assets</a></td>
<td class="nump">$ 1,001<span></span>
</td>
<td class="nump">$ 588<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PrepaidOfferingCosts">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of asset related to consideration paid in advance for offering costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PrepaidOfferingCosts</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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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_DepositsAssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.17)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DepositsAssetsCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherAssetsCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of current assets classified as other.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.8)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherAssetsCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherPrepaidExpenseCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of asset related to consideration paid in advance for other costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 340<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6387103&amp;loc=d3e6435-108320<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (g)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6787-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherPrepaidExpenseCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OtherReceivablesNetCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherReceivablesNetCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PrepaidInsurance">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 340<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6387103&amp;loc=d3e6435-108320<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 340<br> -SubTopic 10<br> -Section 05<br> -Paragraph 5<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=68074540&amp;loc=d3e5879-108316<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (g)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6676-107765<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6787-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PrepaidInsurance</td>
</tr>
<tr>
<td style="padding-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>
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<DOCUMENT>
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<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801027808296">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Property and Equipment, net (Details Narrative) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_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>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_Depreciation', window );">Depreciation expense</a></td>
<td class="nump">$ 33<span></span>
</td>
<td class="nump">$ 40<span></span>
</td>
<td class="nump">$ 106<span></span>
</td>
<td class="nump">$ 117<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_Depreciation">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3602-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_Depreciation</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
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</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>57
<FILENAME>R46.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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</head>
<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022634424">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Property and Equipment, net - Schedule of Components of Property and Equipment (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">$ 1,672<span></span>
</td>
<td class="nump">$ 1,656<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment', window );">Less: accumulated depreciation</a></td>
<td class="num">(1,255)<span></span>
</td>
<td class="num">(1,157)<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentNet', window );">Property and equipment, net</a></td>
<td class="nump">417<span></span>
</td>
<td class="nump">499<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember', window );">Equipment [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">342<span></span>
</td>
<td class="nump">342<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_ComputerEquipmentAndSoftwareMember', window );">Computer Equipment &amp; Software [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">502<span></span>
</td>
<td class="nump">486<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_OfficeFurnitureAndEquipmentMember', window );">Office Furniture &amp; Equipment [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">339<span></span>
</td>
<td class="nump">339<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember', window );">Leasehold Improvements [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">474<span></span>
</td>
<td class="nump">474<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_ConstructionInProcessMember', window );">Construction in Process [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PropertyPlantAndEquipmentGross', window );">Property and equipment, gross</a></td>
<td class="nump">$ 15<span></span>
</td>
<td class="nump">$ 15<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.14)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.13)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentGross</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentNet">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(14))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 360<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(8))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(13))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentNet</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_ComputerEquipmentAndSoftwareMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_ComputerEquipmentAndSoftwareMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_OfficeFurnitureAndEquipmentMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_OfficeFurnitureAndEquipmentMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_ConstructionInProcessMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PropertyPlantAndEquipmentByTypeAxis=OPTT_ConstructionInProcessMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
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</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>58
<FILENAME>R47.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801029346136">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases (Details Narrative) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeasePayments', window );">Operating leases cash payments</a></td>
<td class="nump">$ 259<span></span>
</td>
<td class="nump">$ 240<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_StatementGeographicalAxis=OPTT_MonroeTownshipMember', window );">Monroe Township [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseTermOfContract', window );">Term of lease</a></td>
<td class="text">7 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseOptionToExtend', window );">Option to extend lease</a></td>
<td class="text">The initial lease term is for 7 years with an option to extend the lease for another 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_LesseeOperatingLeaseOptionToExtend">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (a)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918673-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseOptionToExtend</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseTermOfContract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 3<br> -Subparagraph (a)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918673-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseTermOfContract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeasePayments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 5<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121603541&amp;loc=SL77918643-209977<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeasePayments</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_StatementGeographicalAxis=OPTT_MonroeTownshipMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementGeographicalAxis=OPTT_MonroeTownshipMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>59
<FILENAME>R48.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801031558200">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Leases - Schedule of Operating Lease Costs (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeasesAbstract', window );"><strong>Leases [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseCost', window );">Operating lease cost</a></td>
<td class="nump">$ 79<span></span>
</td>
<td class="nump">$ 79<span></span>
</td>
<td class="nump">$ 238<span></span>
</td>
<td class="nump">$ 238<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShortTermLeaseCost', window );">Short-term lease cost</a></td>
<td class="nump">7<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">12<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rou">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeaseCost', window );">Total lease cost</a></td>
<td class="nump">$ 86<span></span>
</td>
<td class="nump">$ 79<span></span>
</td>
<td class="nump">$ 250<span></span>
</td>
<td class="nump">$ 238<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_LeaseCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lease cost recognized by lessee for lease contract.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918686-209980<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=121568110&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LeaseCost</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LeasesAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseCost">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=121568110&amp;loc=SL77918982-209971<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseCost</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of short-term lease cost, excluding expense for lease with term of one month or less.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918686-209980<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=121568110&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<td style="white-space:nowrap;">us-gaap_ShortTermLeaseCost</td>
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<html>
<head>
<title></title>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801111865096">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Leases - Schedule of Right-of Use Assets and Lease Liabilities (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeasesAbstract', window );"><strong>Leases [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseRightOfUseAsset', window );">Operating right-of-use asset, net</a></td>
<td class="nump">$ 1,005<span></span>
</td>
<td class="nump">$ 1,165<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityCurrent', window );">Right-of-use liability- current</a></td>
<td class="nump">252<span></span>
</td>
<td class="nump">229<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiabilityNoncurrent', window );">Right-of-use liability- long term</a></td>
<td class="nump">887<span></span>
</td>
<td class="nump">$ 1,078<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiability', window );">Total lease liability</a></td>
<td class="nump">$ 1,139<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1', window );">Weighted average remaining lease term- operating leases</a></td>
<td class="text">3 years 8 months 19 days<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent', window );">Weighted average discount rate- operating leases</a></td>
<td class="nump">8.50%<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_LeasesAbstract">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LeasesAbstract</td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121603541&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiability</td>
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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>instant</td>
</tr>
</table></div>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121603541&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityCurrent</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121603541&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiabilityNoncurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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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_OperatingLeaseRightOfUseAsset">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's right to use underlying asset under operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121603541&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseRightOfUseAsset</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average discount rate for operating lease calculated at point in time.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918686-209980<br><br>Reference 2: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=121568110&amp;loc=SL77918982-209971<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent</td>
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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>num:percentItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</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_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/exampleRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 55<br> -Paragraph 53<br> -URI http://asc.fasb.org/extlink&amp;oid=121568110&amp;loc=SL77918982-209971<br><br>Reference 2: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (g)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918686-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1</td>
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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>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801107296264">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Leases - Schedule of Future Minimum Lease Payments Under Operating Lease (Details)<br> $ in Thousands</strong></div></th>
<th class="th">
<div>Jan. 31, 2021 </div>
<div>USD ($)</div>
</th>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LeasesAbstract', window );"><strong>Leases [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear', window );">Remainder of fiscal year 2021</a></td>
<td class="nump">$ 84<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths', window );">2022</a></td>
<td class="nump">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="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo', window );">2023</a></td>
<td class="nump">352<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree', window );">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="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour', 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="top.Show.showAR( this, 'defref_us-gaap_OperatingLeasesFutureMinimumPaymentsDue', window );">Total future minimum lease payments</a></td>
<td class="nump">1,323<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount', window );">Less imputed interest</a></td>
<td class="num">(184)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OperatingLeaseLiability', window );">Total</a></td>
<td class="nump">$ 1,139<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_LeasesAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LeasesAbstract</td>
</tr>
<tr>
<td style="padding-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_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 50<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=121609121&amp;loc=SL77918701-209980<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeaseLiability">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Present value of lessee's discounted obligation for lease payments from operating lease.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 842<br> -SubTopic 20<br> -Section 45<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121603541&amp;loc=SL77918627-209977<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeaseLiability</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_OperatingLeasesFutureMinimumPaymentsDue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 840<br> -SubTopic 20<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121573735&amp;loc=d3e41502-112717<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 840<br> -SubTopic 10<br> -Section 55<br> -Paragraph 40<br> -Subparagraph (Note 3)<br> -URI http://asc.fasb.org/extlink&amp;oid=121580752&amp;loc=d3e38371-112697<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OperatingLeasesFutureMinimumPaymentsDue</td>
</tr>
<tr>
<td style="padding-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>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022366552">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PayablesAndAccrualsAbstract', window );"><strong>Payables and Accruals [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ConstructionPayableCurrent', window );">Project costs</a></td>
<td class="nump">$ 95<span></span>
</td>
<td class="nump">$ 48<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LossContingencyAccrualCarryingValueCurrent', window );">Contract loss reserve</a></td>
<td class="nump">425<span></span>
</td>
<td class="nump">216<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherEmployeeRelatedLiabilitiesCurrent', window );">Employee incentive payments</a></td>
<td class="nump">407<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedSalariesCurrent', window );">Accrued salary and benefits</a></td>
<td class="nump">831<span></span>
</td>
<td class="nump">483<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedProfessionalFeesCurrent', window );">Legal and accounting fees</a></td>
<td class="nump">403<span></span>
</td>
<td class="nump">283<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedIncomeTaxesCurrent', window );">Accrued taxes payable</a></td>
<td class="text"> <span></span>
</td>
<td class="nump">177<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_OtherAccruedLiabilitiesCurrent', window );">Other</a></td>
<td class="nump">179<span></span>
</td>
<td class="nump">146<span></span>
</td>
</tr>
<tr class="reu">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AccruedLiabilitiesCurrent', window );">Accrued expenses total</a></td>
<td class="nump">$ 2,340<span></span>
</td>
<td class="nump">$ 1,353<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_AccruedIncomeTaxesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 944<br> -SubTopic 210<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-03(a)(15)(b)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120400017&amp;loc=d3e572229-122910<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(15)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120398452&amp;loc=d3e534808-122878<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(20))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedIncomeTaxesCurrent</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedLiabilitiesCurrent">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedLiabilitiesCurrent</td>
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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>credit</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AccruedProfessionalFeesCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6911-107765<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6935-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedProfessionalFeesCurrent</td>
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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>credit</td>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6911-107765<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6935-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AccruedSalariesCurrent</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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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>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ConstructionPayableCurrent">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Carrying value as of the balance sheet date of obligations incurred and payable for the acquisition of merchandise, materials, supplies and services pertaining to construction projects such as a housing development or factory expansion not classified as trade payables. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.19(a))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ConstructionPayableCurrent</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td>xbrli:monetaryItemType</td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
<td>instant</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LossContingencyAccrualCarryingValueCurrent</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 6<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6911-107765<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 9<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e7018-107765<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section 45<br> -Paragraph 8<br> -URI http://asc.fasb.org/extlink&amp;oid=121566466&amp;loc=d3e6935-107765<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherAccruedLiabilitiesCurrent</td>
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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 class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of obligations incurred for employer-related costs classified as other, payable within one year or the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.20)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_OtherEmployeeRelatedLiabilitiesCurrent</td>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022321528">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Warrants (Details Narrative) - $ / shares<br></strong></div></th>
<th class="th"><div>Apr. 08, 2019</div></th>
<th class="th"><div>Jul. 22, 2016</div></th>
<th class="th"><div>Jun. 02, 2016</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementEquityComponentsAxis=OPTT_PreFundedWarrantsMember', window );">Pre-funded Warrants [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<tr class="ro">
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<td class="nump">3,385,680<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Warrant exercise price per share</a></td>
<td class="nump">$ 0.01<span></span>
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<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_SecondAmendedPurchaseAgreementMember', window );">Second Amended Purchase Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<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="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">29,750<span></span>
</td>
<td class="nump">20,850<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights', window );">Warrant to purchase shares common stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">8,925<span></span>
</td>
<td class="nump">7,298<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Warrant exercise price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 187.20<span></span>
</td>
<td class="nump">$ 121.60<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WarrantsAndRightsOutstandingTerm', window );">Class of warrant or right, expiration period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">5 years<span></span>
</td>
<td class="text">5 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NumberOfExercisedWarrants', window );">Number of exercised warrants</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_SecuritiesPurchaseAgreementMember', window );">Securities Purchase Agreement [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="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>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights', window );">Warrant to purchase shares common stock</a></td>
<td class="nump">4,927,680<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1', window );">Warrant exercise price per share</a></td>
<td class="nump">$ 3.85<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_WarrantsAndRightsOutstandingTerm', window );">Class of warrant or right, expiration period</a></td>
<td class="text">5 years<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NumberOfExercisedWarrants', window );">Number of exercised warrants</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">677,500<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_NumberOfExercisedWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of exercised warrants.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_NumberOfExercisedWarrants</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Exercise price per share or per unit of warrants or rights outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 3<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21475-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num: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_SaleOfStockNumberOfSharesIssuedInTransaction">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_WarrantsAndRightsOutstandingTerm">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 820<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (bbb)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=117815213&amp;loc=d3e19207-110258<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_WarrantsAndRightsOutstandingTerm</td>
</tr>
<tr>
<td style="padding-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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementEquityComponentsAxis=OPTT_PreFundedWarrantsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_SecondAmendedPurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_SecondAmendedPurchaseAgreementMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_SecuritiesPurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_SecuritiesPurchaseAgreementMember</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>
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<DESCRIPTION>IDEA: XBRL DOCUMENT
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<head>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801031575144">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Paycheck Protection Program Loan (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th"><div>Jun. 05, 2020</div></th>
<th class="th"><div>May 05, 2020</div></th>
<th class="th"><div>May 05, 2020</div></th>
<th class="th"><div>May 03, 2020</div></th>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PayrollProtectionFlexibilityDescription', window );">Payroll protection flexibility, description</a></td>
<td class="text">Paycheck Protection Program Flexibility Act ("PPPFA") was signed into law. Among other changes, the PPPFA (a) reduced the amount of the loan required to be spent on payroll costs from 75% to 60%, (b) extended the covered period to 24 weeks from 8 weeks, (c) extended the repayment term of the PPP loan from 2 years to 5 years, and (d) increased the deferred payment date from 6 months to 10 months. For the loans disbursed before June 5, 2020, the PPPFA provides the option to opt for 24 weeks for spending the loan instead of 8 weeks. The Company opted for 24 weeks to spend the loan.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_PaycheckProtectionProgramMember', window );">Paycheck Protection Program [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ProceedsFromLoanOriginations1', window );">Proceeds from loan</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 890,347<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtInstrumentInterestRateStatedPercentage', window );">Debt instrument, interest rate</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">1.00%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_DebtForgivenessDescription', window );">Debt forgiveness, description</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">The SBA allows loan forgiveness for eligible costs incurred and paid which include (a) payroll costs, (b) interest on any real or personal property mortgage prior to February 15, 2020, (c) rent on any lease in force prior to February 15, 2020, and (d) utility payments for which service began before February 15, 2020. As of January 31, 2021, the Company has utilized all of the loan proceeds. The Company currently believes that the use of the loan proceeds will meet the conditions for forgiveness of the loan and has submitted a loan forgiveness application to the SBA asking for 100% forgiveness of the loan. No assurance can be provided that the Company will obtain forgiveness of the loan, in whole or in part.<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_PaycheckProtectionProgramMember', window );">Paycheck Protection Program [Member] | 6 Months After Disbursement Date [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RepaymentsOfLongTermDebt', window );">Repayments of loan</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 49,000<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_DebtForgivenessDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Description for the amount decreases as the indebtedness forgiven by the holder of the debt instrument.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_DebtForgivenessDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</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_PayrollProtectionFlexibilityDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Payroll protection flexibility, description.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PayrollProtectionFlexibilityDescription</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_DebtInstrumentInterestRateStatedPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Contractual interest rate for funds borrowed, under the debt agreement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.22(a)(1))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentInterestRateStatedPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num: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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Cash inflow associated with loan origination (the process when securing a mortgage for a piece of real property) or lease origination.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 12<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3179-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ProceedsFromLoanOriginations1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RepaymentsOfLongTermDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RepaymentsOfLongTermDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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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>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_PaycheckProtectionProgramMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_PaycheckProtectionProgramMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_StatementScenarioAxis=OPTT_SixMonthsAfterDisbursementDateMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementScenarioAxis=OPTT_SixMonthsAfterDisbursementDateMember</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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</div>
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<DOCUMENT>
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<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801103619144">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Loan Payable (Details Narrative) - USD ($)<br></strong></div></th>
<th class="th" colspan="1">1 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Aug. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_DebtDisclosureAbstract', window );"><strong>Debt Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_InsuranceFundingAmount', window );">Insurance funding amount</a></td>
<td class="nump">$ 466,622<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_InsuranceCommissionsAndFees', window );">Insurance monthly payment</a></td>
<td class="nump">$ 58,957<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RepaymentsOfDebt', window );">Repayments of loan</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 292,000<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_InsuranceFundingAmount">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Insurance funding amount.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_InsuranceFundingAmount</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_DebtDisclosureAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtDisclosureAbstract</td>
</tr>
<tr>
<td style="padding-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_InsuranceCommissionsAndFees">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 942<br> -SubTopic 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.9-04.13(c),(d))<br> -URI http://asc.fasb.org/extlink&amp;oid=120399700&amp;loc=SL114874048-224260<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 220<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.7-04.4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120400993&amp;loc=SL114874131-224263<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_InsuranceCommissionsAndFees</td>
</tr>
<tr>
<td style="padding-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_RepaymentsOfDebt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 15<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&amp;loc=d3e3291-108585<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RepaymentsOfDebt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
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<head>
<title></title>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801031597352">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Preferred Stock (Details Narrative) - $ / shares<br></strong></div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EquityAbstract', window );"><strong>Equity [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesAuthorized', window );">Preferred stock, shares authorized</a></td>
<td class="nump">5,000,000<span></span>
</td>
<td class="nump">5,000,000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockParOrStatedValuePerShare', window );">Preferred stock, par value</a></td>
<td class="nump">$ 0.001<span></span>
</td>
<td class="nump">$ 0.001<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PreferredStockSharesIssued', window );">Preferred stock, shares issued</a></td>
<td class="text"> <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_us-gaap_EquityAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EquityAbstract</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockParOrStatedValuePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><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>num:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PreferredStockSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_PreferredStockSharesIssued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><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>
</div>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801021106472">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Common Stock (Details Narrative) - USD ($)<br> $ / shares in Units, $ in Thousands</strong></div></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1">9 Months Ended</th>
<th class="th" colspan="1">12 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Dec. 23, 2020</div></th>
<th class="th"><div>Nov. 20, 2020</div></th>
<th class="th"><div>Sep. 18, 2020</div></th>
<th class="th"><div>Oct. 24, 2019</div></th>
<th class="th"><div>Jan. 07, 2019</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Apr. 30, 2021</div></th>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandNinteenATMFacilityMember', window );">2019 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>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ProceedsFromInitialPublicOffering', window );">Aggregate offering price</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">$ 25,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_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">17,595,472<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 23,400<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.33<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PaymentOfSalesCommission', window );">Payment of sales commission</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 800<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandNinteenATMFacilityMember', window );">2019 ATM Facility [Member] | Alliance Global Partners [Member] | Forecast [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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">12,342,506<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 18,700<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.51<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PaymentOfSalesCommission', window );">Payment of sales commission</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 800<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember', window );">2020 ATM Facility [Member] | 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>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_ProceedsFromInitialPublicOffering', window );">Aggregate offering price</a></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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">17,179,883<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 50,000<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="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2.91<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PaymentOfSalesCommission', window );">Payment of sales commission</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1,600<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember', window );">Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">6,424,205<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,250,000<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="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 4,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 7,400<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockPricePerShare', window );">Combined purchase price per share</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 0.63<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 3.28<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee', window );">Aggregate purchase of common stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="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>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval', window );">Percentage of outstanding common stock limit for shareholder approval</a></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>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage', window );">Number of 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="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 custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval', window );">Number of additional shares that can be issued upon shareholder approval</a></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>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember', window );">Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member] | Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee', window );">Aggregate purchase of common stock</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementOneMember', window );">Stock Purchase Agreement [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>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction', window );">Number of common stock shares sold</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">5,025,000<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="top.Show.showAR( this, 'defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction', window );">Proceeds from issuance or sale of equity, net of issuance costs</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2,900,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_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">$ 0.57<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of additional shares that can be issued upon shareholder approval.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PaymentOfSalesCommission">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Payment of sales commission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PaymentOfSalesCommission</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Percentage of outstanding common stock limit for shareholder approval.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_PercentageOfOutstandingCommonStockLimitForShareholderApproval</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_ProceedsFromInitialPublicOffering">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The cash inflow associated with the amount received from entity's first offering of stock to the public.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_ProceedsFromInitialPublicOffering</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares can be issued based upon outstanding percentage.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate purchase of common stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockIssuedDuringPeriodValueIssuedForCommitmentFee</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>credit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SaleOfStockConsiderationReceivedPerTransaction">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockConsiderationReceivedPerTransaction</td>
</tr>
<tr>
<td style="padding-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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SaleOfStockPricePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SaleOfStockPricePerShare</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num: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_TypeOfArrangementAxis=OPTT_TwoThousandNinteenATMFacilityMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandNinteenATMFacilityMember</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_dei_LegalEntityAxis=OPTT_AGPAllianceGlobalPartnersMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=OPTT_AGPAllianceGlobalPartnersMember</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_StatementScenarioAxis=srt_ScenarioForecastMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementScenarioAxis=srt_ScenarioForecastMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_TwoThousandTwentyATMFacilityMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementMember</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_dei_LegalEntityAxis=OPTT_AspireCapitalFundLLCMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LegalEntityAxis=OPTT_AspireCapitalFundLLCMember</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td>na</td>
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<tr>
<td><strong> Balance Type:</strong></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
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</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MaximumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MaximumMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementOneMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TypeOfArrangementAxis=OPTT_StockPurchaseAgreementOneMember</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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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801027799800">
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<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Treasury Shares (Details Narrative) - shares<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EquityAbstract', window );"><strong>Equity [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="text">&#160;<span></span>
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<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_TreasuryStockSharesAcquired', window );">Treasury stock, shares, acquired</a></td>
<td class="num">(16,789)<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="num">(16,789)<span></span>
</td>
<td class="num">(481)<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="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EquityAbstract</td>
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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>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares that have been repurchased during the period and are being held in treasury.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_TreasuryStockSharesAcquired</td>
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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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<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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<html>
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<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801021649704">
<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="3">1 Months Ended</th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
<th class="th" colspan="1"></th>
<th class="th" colspan="1"></th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Dec. 31, 2019</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</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="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Restricted stock options, granted during period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">10,000<span></span>
</td>
<td class="nump">10,000<span></span>
</td>
<td class="nump">13,513<span></span>
</td>
<td class="nump">13,513<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Employee Stock Option [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Number of shares granted during the period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">248,876<span></span>
</td>
<td class="nump">248,876<span></span>
</td>
<td class="nump">411,666<span></span>
</td>
<td class="nump">411,666<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue', window );">Share-based compensation intrinsic value of outstanding</a></td>
<td class="nump">$ 900,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 900,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 900,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1', window );">Share-based compensation options, exercisable intrinsic value</a></td>
<td class="nump">$ 600,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 600,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 600,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares', window );">Share-based compensation unvested shares of stock options</a></td>
<td class="nump">269,208<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">269,208<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">269,208<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1', window );">Share-based compensation weighted average remaining contractual term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">9 years 10 months 25 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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based compensation expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 82,000<span></span>
</td>
<td class="nump">$ 44,000<span></span>
</td>
<td class="nump">$ 300,000<span></span>
</td>
<td class="nump">$ 200,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Employee Stock Option [Member] | Performance-based Stock Options [Member] | Two Executives [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Number of shares granted during the period</a></td>
<td class="nump">344,723<span></span>
</td>
<td class="nump">81,334<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_StockOptionsVestingPeriodDescription', window );">Stock options vesting period, description</a></td>
<td class="text">The awards vest over 2 years provided there is positive total shareholder return (e.g. share price increase) as measured to the closing share price on Jannuary 14, 2022 and January 14, 2023.<span></span>
</td>
<td class="text">The awards can vest over 2 years if there is positive total shareholder return (e.g. share price increase) as measured to the 5-day (January 11-15, 2021) and (January 10-14, 2022) share price Volume Weighted Average Price ("VWAP").<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Employee Stock Option [Member] | Subject to Service- Based Vesting Requirements [Member] | Employee [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>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions', window );">Unrecognized compensation cost related to non-vested stock options</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="nump">0<span></span>
</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>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Restricted stock options, granted during period</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">51,547<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_EmployeeStockOptionOneMember', window );">Employee Stock Option One [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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue', window );">Share-based compensation intrinsic value of outstanding</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="nump">300,000<span></span>
</td>
<td class="text">&#160;<span></span>
</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="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_NonVestedStockMember', window );">Non-vested Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions', window );">Unrecognized compensation cost related to non-vested stock options</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="nump">700,000<span></span>
</td>
<td class="text">&#160;<span></span>
</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>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based compensation cost expected to recognize weighted-average term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">1 year 10 months 25 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>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember', window );">Performance Stock Options [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue', window );">Share-based compensation intrinsic value of outstanding</a></td>
<td class="nump">600,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">600,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 600,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1', window );">Share-based compensation options, exercisable 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="nump">$ 0<span></span>
</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>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares', window );">Share-based compensation unvested shares of stock options</a></td>
<td class="nump">385,389<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">385,389<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">385,389<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested', window );">Share-based compensation unvested shares of stock options intrinsic value</a></td>
<td class="nump">$ 500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 500,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1', window );">Share-based compensation weighted average remaining contractual term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">9 years 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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based compensation expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">26,000<span></span>
</td>
<td class="nump">1,600<span></span>
</td>
<td class="nump">$ 43,000<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="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions', window );">Unrecognized compensation cost related to non-vested stock options</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="nump">700,000<span></span>
</td>
<td class="text">&#160;<span></span>
</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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based compensation cost expected to recognize weighted-average term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</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>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember', window );">Restricted Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based compensation expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2,000<span></span>
</td>
<td class="nump">5,000<span></span>
</td>
<td class="nump">$ 12,000<span></span>
</td>
<td class="nump">10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1', window );">Share-based compensation cost expected to recognize weighted-average term</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">1 year<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks', window );">Unrecognized compensation cost remaining related to unvested restricted stock</a></td>
<td class="nump">$ 28,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">28,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 28,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_StockOptionMember', window );">Stock Option [Member] | Subject to Service- Based Vesting Requirements [Member] | Employee [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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AllocatedShareBasedCompensationExpense', window );">Share-based compensation expense</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,000<span></span>
</td>
<td class="nump">$ 7,000<span></span>
</td>
<td class="nump">$ 30,000<span></span>
</td>
<td class="nump">$ 8,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember', window );">2015 Omnibus Incentive Plan [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized', window );">Share-based compensation arrangement by share-based payment award, number of shares authorized</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1,332,036<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance', window );">Stock based compensation shares, available for grant</a></td>
<td class="nump">193,928<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">193,928<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">193,928<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_PlanNameAxis=OPTT_TwoThousandAndEighteenInducementPlanMember', window );">2018 Inducement Plan [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance', window );">Stock based compensation shares, available for grant</a></td>
<td class="nump">11,487<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">11,487<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">11,487<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_StockOptionsVestingPeriodDescription">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Stock options vesting period, description.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_StockOptionsVestingPeriodDescription</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Unrecognized compensation cost remaining related to unvested restricted stock.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_UnrecognizedCompensationCostRemainingRelatedToUnvestedRestrictedStocks</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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 1<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5047-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 14.F)<br> -URI http://asc.fasb.org/extlink&amp;oid=115993241&amp;loc=d3e301413-122809<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (h)(1)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AllocatedShareBasedCompensationExpense</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Aggregate number of common shares reserved for future issuance.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02.29)<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_CommonStockCapitalSharesReservedForFutureIssuance</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of cost to be recognized for option under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of shares authorized for issuance under share-based payment arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (a)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Gross number of share options (or share units) granted during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested</td>
</tr>
<tr>
<td style="padding-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_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:monetaryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>debit</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of non-vested options outstanding.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_StatementScenarioAxis=OPTT_PerformancceBasedStockOptionsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementScenarioAxis=OPTT_PerformancceBasedStockOptionsMember</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_TitleOfIndividualAxis=OPTT_TwoExecutivesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_TitleOfIndividualAxis=OPTT_TwoExecutivesMember</td>
</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_StatementScenarioAxis=OPTT_SubjectToServiceBasedVestingRequirementsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementScenarioAxis=OPTT_SubjectToServiceBasedVestingRequirementsMember</td>
</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_TitleOfIndividualAxis=OPTT_EmployeeMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_TitleOfIndividualAxis=OPTT_EmployeeMember</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=OPTT_EmployeeStockOptionOneMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_EmployeeStockOptionOneMember</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=OPTT_NonVestedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_NonVestedStockMember</td>
</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_PerformanceSharesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember</td>
</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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember</td>
</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_StockOptionMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_StockOptionMember</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_PlanNameAxis=OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PlanNameAxis=OPTT_TwoThousandAndFifteenOmnibusIncentivePlanMember</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_PlanNameAxis=OPTT_TwoThousandAndEighteenInducementPlanMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_PlanNameAxis=OPTT_TwoThousandAndEighteenInducementPlanMember</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>70
<FILENAME>R59.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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</head>
<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022207992">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Share-Based Compensation - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</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">1.50%<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate', window );">Expected dividend yield</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">146.10%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MinimumMember', window );">Minimum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0.07%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">6 months<span></span>
</td>
<td class="text">1 year 3 months 19 days<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">109.80%<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MaximumMember', window );">Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">0.08%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">9 months<span></span>
</td>
<td class="text">1 year 4 months 24 days<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</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">130.10%<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Employee Stock 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>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="nump">0.60%<span></span>
</td>
<td class="nump">1.70%<span></span>
</td>
<td class="nump">0.60%<span></span>
</td>
<td class="nump">1.70%<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate', window );">Expected dividend yield</a></td>
<td class="nump">0.00%<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="nump">136.50%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">136.50%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Employee Stock Option [Member] | Minimum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">5 years 6 months<span></span>
</td>
<td class="text">5 years 6 months<span></span>
</td>
<td class="text">5 years 6 months<span></span>
</td>
<td class="text">5 years 6 months<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">127.60%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">127.60%<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember', window );">Employee Stock Option [Member] | Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">5 years 8 months 12 days<span></span>
</td>
<td class="text">5 years 8 months 12 days<span></span>
</td>
<td class="text">5 years 8 months 12 days<span></span>
</td>
<td class="text">5 years 8 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="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">128.20%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">128.20%<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember', window );">Performance Stock Options [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="nump">1.20%<span></span>
</td>
<td class="nump">2.30%<span></span>
</td>
<td class="nump">1.20%<span></span>
</td>
<td class="nump">2.30%<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate', window );">Expected dividend yield</a></td>
<td class="nump">0.00%<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">10 years<span></span>
</td>
<td class="text">10 years<span></span>
</td>
<td class="text">10 years<span></span>
</td>
<td class="text">10 years<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">115.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">115.00%<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember', window );">Performance Stock Options [Member] | Minimum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="nump">76.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">76.00%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember', window );">Performance Stock Options [Member] | Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="nump">136.50%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">136.50%<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_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The risk-free interest rate assumption that is used in valuing an option on its own shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iv)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num: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_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 14.D.2)<br> -URI http://asc.fasb.org/extlink&amp;oid=115993241&amp;loc=d3e301413-122809<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MinimumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MinimumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</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_RangeAxis=srt_MaximumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MaximumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</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_EmployeeStockOptionMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
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<DOCUMENT>
<TYPE>XML
<SEQUENCE>71
<FILENAME>R60.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801022138872">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Share-Based Compensation - Schedule of Stock Option Activity (Details)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th">
<div>Jan. 31, 2021 </div>
<div>$ / shares </div>
<div>shares</div>
</th></tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_StockIncentivePlanMember', window );">Stock Incentive Plan [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares Underlying Options Outstanding, Beginning | shares</a></td>
<td class="nump">474,128<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Shares Underlying Options Outstanding, Granted | shares</a></td>
<td class="nump">248,876<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Shares Underlying Options Outstanding, Exercised | shares</a></td>
<td class="num">(175,500)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod', window );">Shares Underlying Options Outstanding, Cancelled/forfeited | shares</a></td>
<td class="num">(28,719)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares Underlying Options Outstanding, Ending | shares</a></td>
<td class="nump">518,785<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber', window );">Shares Underlying Options Outstanding, Exercisable at Ending | shares</a></td>
<td class="nump">249,577<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Beginning Balance | $ / shares</a></td>
<td class="nump">$ 3.56<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Granted | $ / shares</a></td>
<td class="nump">2.93<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercised | $ / shares</a></td>
<td class="nump">1.05<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Cancelled/forfeited | $ / shares</a></td>
<td class="nump">6.29<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Ending Balance | $ / shares</a></td>
<td class="nump">3.96<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercisable at Ending | $ / shares</a></td>
<td class="nump">$ 5.21<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2', window );">Weighted Average Remaining Contractual Term (In Years), Beginning</a></td>
<td class="text">9 years 4 months 24 days<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm', window );">Weighted Average Remaining Contractual Term (In Years), Ending</a></td>
<td class="text">9 years 2 months 12 days<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1', window );">Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending</a></td>
<td class="text">8 years 6 months<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_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="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares Underlying Options Outstanding, Beginning | shares</a></td>
<td class="nump">81,347<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross', window );">Shares Underlying Options Outstanding, Granted | shares</a></td>
<td class="nump">344,723<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised', window );">Shares Underlying Options Outstanding, Exercised | 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="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod', window );">Shares Underlying Options Outstanding, Cancelled/forfeited | shares</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="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber', window );">Shares Underlying Options Outstanding, Ending | shares</a></td>
<td class="nump">426,070<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber', window );">Shares Underlying Options Outstanding, Exercisable at Ending | shares</a></td>
<td class="nump">40,681<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Beginning Balance | $ / shares</a></td>
<td class="nump">$ 1.05<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Granted | $ / shares</a></td>
<td class="nump">2.93<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercised | $ / 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="top.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="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Ending Balance | $ / shares</a></td>
<td class="nump">2.57<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice', window );">Weighted Average Exercise Price, Exercisable at Ending | $ / shares</a></td>
<td class="nump">$ 1.05<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2', window );">Weighted Average Remaining Contractual Term (In Years), Beginning</a></td>
<td class="text">9 years 8 months 12 days<span></span>
</td>
</tr>
<tr class="re">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm', window );">Weighted Average Remaining Contractual Term (In Years), Ending</a></td>
<td class="text">9 years 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="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1', window );">Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending</a></td>
<td class="text">9 years<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>OPTT_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(3)-(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price of options that were either forfeited or expired.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(3)-(4)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Gross number of share options (or share units) granted during the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of options outstanding, including both vested and non-vested options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)-(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>instant</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average price at which option holders acquired shares when converting their stock options into shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:perShareItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (e)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<td><strong> Data Type:</strong></td>
<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>
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</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of share options (or share units) exercised during the current period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.3-04)<br> -URI http://asc.fasb.org/extlink&amp;oid=120397183&amp;loc=d3e187085-122770<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(28))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 210<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SX 210.5-02(29))<br> -URI http://asc.fasb.org/extlink&amp;oid=120391452&amp;loc=d3e13212-122682<br><br>Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 505<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -URI http://asc.fasb.org/extlink&amp;oid=109259400&amp;loc=d3e21463-112644<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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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 class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_StockIncentivePlanMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<tr>
<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_PerformanceStockOptionsMember</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
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<td><strong> Period Type:</strong></td>
<td></td>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801021573208">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Share-Based Compensation - Schedule of Non-vested Restricted Stock Activity (Details) - $ / shares<br></strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</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="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Number of Shares, Granted</a></td>
<td class="nump">10,000<span></span>
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<td class="nump">10,000<span></span>
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<td class="nump">13,513<span></span>
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<td class="nump">13,513<span></span>
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<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_AwardTypeAxis=OPTT_NonVestedRestrictedStockMember', window );">Non-vested Restricted Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Number of Shares, Issued and unvested, Beginning</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">13,513<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod', window );">Number of Shares, Granted</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod', window );">Number of Shares, Vested</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="num">(13,513)<span></span>
</td>
<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod', window );">Number of Shares, Cancelled/forfeited</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber', window );">Number of Shares, Issued and Unvested, Ending</a></td>
<td class="nump">10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">10,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Issued and Unvested, Beginning</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 1.48<span></span>
</td>
<td class="text">&#160;<span></span>
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<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Granted</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">2.93<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="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Vested</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1.48<span></span>
</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="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Cancelled/forfeited</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</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="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue', window );">Weighted Average Price per Share, Issued and Unvested, Ending</a></td>
<td class="nump">$ 2.93<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 2.93<span></span>
</td>
<td class="text">&#160;<span></span>
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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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(1)(iv)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:sharesItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(3)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:perShareItemType</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>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod</td>
</tr>
<tr>
<td style="padding-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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(1)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num: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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(i)-(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber</td>
</tr>
<tr>
<td style="padding-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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(i)-(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num: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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</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="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (c)(2)(iii)(2)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num: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_AwardTypeAxis=OPTT_NonVestedRestrictedStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_NonVestedRestrictedStockMember</td>
</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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</div>
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<head>
<title></title>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801023042152">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Fair Value Measurements (Details Narrative) - USD ($)<br> $ in Thousands</strong></div></th>
<th class="th" colspan="2">3 Months Ended</th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueDisclosuresAbstract', window );"><strong>Fair Value Disclosures [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_FairValueAdjustmentOfWarrants', window );">Gain due to the change in fair value of warrant liabilities</a></td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="text"> <span></span>
</td>
<td class="nump">$ 6<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_FairValueAdjustmentOfWarrants">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of expense (income) related to adjustment to fair value of warrant liability.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 230<br> -SubTopic 10<br> -Section 45<br> -Paragraph 28<br> -Subparagraph (b)<br> -URI http://asc.fasb.org/extlink&amp;oid=121586364&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 480<br> -SubTopic 10<br> -Section 25<br> -Paragraph 13<br> -URI http://asc.fasb.org/extlink&amp;oid=109262497&amp;loc=d3e20148-110875<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueAdjustmentOfWarrants</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>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_FairValueDisclosuresAbstract</td>
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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: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>
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<DOCUMENT>
<TYPE>XML
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<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801023027224">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Fair Value Measurements - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)<br></strong></div></th>
<th class="th" colspan="2">9 Months Ended</th>
</tr>
<tr>
<th class="th"><div>Jan. 31, 2021</div></th>
<th class="th"><div>Jan. 31, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate', window );">Expected dividend yield</a></td>
<td class="nump">0.00%<span></span>
</td>
<td class="nump">0.00%<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">1.50%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="nump">146.10%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MinimumMember', window );">Minimum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="nump">0.07%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">6 months<span></span>
</td>
<td class="text">1 year 3 months 19 days<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">109.80%<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_srt_RangeAxis=srt_MaximumMember', window );">Maximum [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate', window );">Risk-free interest rate</a></td>
<td class="nump">0.08%<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1', window );">Expected life (in years)</a></td>
<td class="text">9 months<span></span>
</td>
<td class="text">1 year 4 months 24 days<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate', window );">Expected volatility</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">130.10%<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(ii)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The risk-free interest rate assumption that is used in valuing an option on its own shares.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(iv)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>num: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_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section 50<br> -Paragraph 2<br> -Subparagraph (f)(2)(i)<br> -URI http://asc.fasb.org/extlink&amp;oid=120381028&amp;loc=d3e5070-113901<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 718<br> -SubTopic 10<br> -Section S99<br> -Paragraph 1<br> -Subparagraph (SAB Topic 14.D.2)<br> -URI http://asc.fasb.org/extlink&amp;oid=115993241&amp;loc=d3e301413-122809<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>us-gaap_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:durationItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_RangeAxis=srt_MinimumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MinimumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</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_srt_RangeAxis=srt_MaximumMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_RangeAxis=srt_MaximumMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</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>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801020967384">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Commitments and Contingencies (Details Narrative)<br></strong></div></th>
<th class="th">
<div>Mar. 03, 2020 </div>
<div>$ / shares</div>
</th>
<th class="th">
<div>Aug. 28, 2018 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Jan. 25, 2021 </div>
<div>EUR (&#8364;)</div>
</th>
<th class="th">
<div>Oct. 31, 2020 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Oct. 31, 2020 </div>
<div>EUR (&#8364;)</div>
</th>
<th class="th">
<div>Apr. 30, 2020 </div>
<div>USD ($)</div>
</th>
<th class="th">
<div>Apr. 30, 2020 </div>
<div>EUR (&#8364;)</div>
</th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SharesIssuedPricePerShare', window );">Share price per share | $ / shares</a></td>
<td class="nump">$ 1.00<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl custom" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_OPTT_NasdaqDelistingNotificationDescription', window );">Nasdaq delisting notification description</a></td>
<td class="text">The Company received notification from Nasdaq that, as a result of the closing bid price of the Company's common stock being over $1.00 for 10 consecutive trading days, the Company has regained compliance with Listing Rule 5550(a)(2) to maintain the listing of its common stock on Nasdaq and Nasdaq considers the matter closed.<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember', window );">Selling, General and Administrative [Member] | Recorded Additional Penalty [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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued', window );">Income tax examination, penalties and interest accrued | $</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 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="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember', window );">Selling, General and Administrative [Member] | Euro [Member] | Recorded Additional Penalty [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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued', window );">Income tax examination, penalties and interest accrued | &#8364;</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">&#8364; 117,146<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember', window );">Selling, General and Administrative [Member] | Tax Authority, Spain [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued', window );">Income tax examination, penalties and interest accrued | $</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 331,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 177,000<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="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember', window );">Selling, General and Administrative [Member] | Tax Authority, Spain [Member] | Euro [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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued', window );">Income tax examination, penalties and interest accrued | &#8364;</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">&#8364; 279,870<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember', window );">Selling, General and Administrative [Member] | Tax Authority, Spain [Member] | Euro [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>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued', window );">Income tax examination, penalties and interest accrued | &#8364;</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">&#8364; 279,870<span></span>
</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">&#8364; 162,724<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=OPTT_CharlesFDunleavyMember', window );">Charles F. Dunleavy [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_LossContingencyDamagesSoughtValue', window );">Damages sought value | $</a></td>
<td class="text">&#160;<span></span>
</td>
<td class="nump">$ 5,000,000<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
<td class="text">&#160;<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_OPTT_NasdaqDelistingNotificationDescription">
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Nasdaq delisting notification description.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">OPTT_NasdaqDelistingNotificationDescription</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>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>
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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_IncomeTaxExaminationPenaltiesAndInterestAccrued">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 50<br> -Paragraph 15<br> -Subparagraph (c)<br> -URI http://asc.fasb.org/extlink&amp;oid=84230637&amp;loc=d3e32718-109319<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<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>
</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_LossContingencyDamagesSoughtValue">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The value (monetary amount) of the award the plaintiff seeks in the legal matter.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 9<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14557-108349<br><br>Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 4<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14435-108349<br><br>Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 450<br> -SubTopic 20<br> -Section 50<br> -Paragraph 1<br> -URI http://asc.fasb.org/extlink&amp;oid=121557415&amp;loc=d3e14326-108349<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_LossContingencyDamagesSoughtValue</td>
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<tr>
<td style="padding-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>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_SharesIssuedPricePerShare">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Per share or per unit amount of equity securities issued.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_SharesIssuedPricePerShare</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember</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>
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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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</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_srt_StatementScenarioAxis=OPTT_RecordedAdditionalPenaltyMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">srt_StatementScenarioAxis=OPTT_RecordedAdditionalPenaltyMember</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=OPTT_EURMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=OPTT_EURMember</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_IncomeTaxAuthorityNameAxis=us-gaap_TaxAuthoritySpainMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_TaxAuthoritySpainMember</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=currency_EUR">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_AwardTypeAxis=currency_EUR</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>
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</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=OPTT_CharlesFDunleavyMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=OPTT_CharlesFDunleavyMember</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;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801029015672">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Income Taxes (Details Narrative)<br></strong></div></th>
<th class="th">
<div>Jan. 31, 2021 </div>
<div>USD ($)</div>
</th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_IncomeTaxDisclosureAbstract', window );"><strong>Income Tax Disclosure [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_UnrecognizedTaxBenefits', window );">Uncertain tax positions</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_us-gaap_IncomeTaxDisclosureAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_IncomeTaxDisclosureAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></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>
</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_UnrecognizedTaxBenefits">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Amount of unrecognized tax benefits.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/disclosureRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 740<br> -SubTopic 10<br> -Section 45<br> -Paragraph 10B<br> -URI http://asc.fasb.org/extlink&amp;oid=120406818&amp;loc=SL37586934-109318<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 50<br> -Paragraph 15A<br> -Subparagraph (a)<br> -URI http://asc.fasb.org/extlink&amp;oid=84230637&amp;loc=SL6600010-109319<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_UnrecognizedTaxBenefits</td>
</tr>
<tr>
<td style="padding-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>
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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>instant</td>
</tr>
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<head>
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<link rel="stylesheet" type="text/css" href="report.css">
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801033244216">
<tr>
<th class="tl" colspan="1" rowspan="2"><div style="width: 200px;"><strong>Operating Segments and Geographic Information (Details Narrative)<br></strong></div></th>
<th class="th" colspan="1">9 Months Ended</th>
</tr>
<tr><th class="th">
<div>Jan. 31, 2021 </div>
<div>segments</div>
</th></tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SegmentReportingAbstract', window );"><strong>Segment Reporting [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_NumberOfReportableSegments', window );">Number of reportable segments</a></td>
<td class="nump">1<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_NumberOfReportableSegments">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef<br> -Publisher FASB<br> -Name Accounting Standards Codification<br> -Topic 280<br> -SubTopic 10<br> -Section 50<br> -Paragraph 18<br> -URI http://asc.fasb.org/extlink&amp;oid=120311839&amp;loc=d3e8672-108599<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_NumberOfReportableSegments</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:integerItemType</td>
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<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm139801107296264">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Subsequent Events (Details Narrative) - Subsequent Event [Member] - Unit Purchase Agreement [Member] - 3dent Technology, LLC [Member]<br></strong></div></th>
<th class="th">
<div>Feb. 01, 2021 </div>
<div>USD ($) </div>
<div>shares</div>
</th>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember', window );">Performance Stock Options [Member] | Former Owners [Member]</a></td>
<td class="text">&#160;<span></span>
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<td class="text">In addition the former owners of 3dent will be eligible for awards of performance stock with a potential value of $360,000 if certain revenue targets are achieved over the next 12 months.<span></span>
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<td class="nump">361,991<span></span>
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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
