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Income Taxes (Details Narrative)	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Acquisition outstanding common stock ownership percentage	4.99%

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- Definition

Business acquisition outstanding common stock ownership percentage.

+ References

No definition available.

+ Details

Name:	OPTT_BusinessAcquisitionOutstandingCommonStockOwnershipPercentage
Namespace Prefix:	OPTT_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration