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Schedule of Significant Changes in Contract Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2024 | Apr. 30, 2023
Account Receivable Contract Assets And Contract Liabilities |  |
Transferred to receivables from contract assets recognized during the period | $ (1,879) | $ (1,768)
Revenue recognized and not billed during the period | 1,745 | 1,534
Net change in contract assets | $ (134) | $ (234)

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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Namespace Prefix: | OPTT_
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- Definition Transferred to receivables from contract assets recognized. + References No definition available. + Details
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Namespace Prefix: | OPTT_
Data Type: | xbrli:monetaryItemType
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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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