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Income Taxes (Details Narrative) | Jun. 30, 2023
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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
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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