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Schedule of Significant Changes in Contract Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	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)

X

- References

No definition available.

+ Details

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Namespace Prefix:	OPTT_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revenue recognized and not billed.

+ References

No definition available.

+ Details

Name:	OPTT_RevenueRecognizedAndNotBilled
Namespace Prefix:	OPTT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Transferred to receivables from contract assets recognized.

+ References

No definition available.

+ Details

Name:	OPTT_TransferredToReceivablesFromContractAssetsRecognized
Namespace Prefix:	OPTT_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration