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Schedule of Significant Changes in Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Accounts Receivable Contract Assets And Contract Liabilities
Revenue recognized	$ (115)	$ (545)
Payments collected for which revenue has not been recognized	250	689
Net change in contract liabilities	$ 135	$ 144

X

- Definition

Contract with customer liability revenue recognized including opening balance.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Revenue recognized and not billed as of the end of the period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ 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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 912
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478345/912-310-45-11

+ Details

Name:	us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration