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Schedule of Significant Changes in Contract Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Accounts Receivable Contract Assets And Contract Liabilities
Transferred to receivables from contract assets recognized	$ (377)	$ (434)
Revenue recognized and not billed	518	714
Net change in contract assets	$ 141	$ 280

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

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

X

- Definition

Transferred to receivables from contract assets recognized.

+ References

No definition available.

+ Details

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

X

- 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

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