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Account Receivable, Contract Assets, and Contract Liabilities (Tables) | 12 Months Ended
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Apr. 30, 2023
Account Receivable Contract Assets And Contract Liabilities |
Schedule of Accounts Receivable, Contract Assets and Contract Liabilities | The following provides further details on the balance sheet accounts of accounts receivable, contract assets and contract liabilities from contracts with customers: Schedule of Accounts Receivable, Contract Assets and Contract Liabilities
|  | 2023 |  |  | 2022 |  |  |  |  |
|  | Fiscal year ended April 30, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | (in thousands) |  |  |  |  |
Accounts receivable |  | $ | 745 |  |  | $ | 482 |  |  | $ | 350 |
Contract assets |  |  | 152 |  |  |  | 386 |  |  |  | 190 |
Contract liabilities |  |  | 1,378 |  |  |  | 129 |  |  |  | — |
Schedule of Significant Changes in Contract assets | Significant changes in the contract assets balances during the period are as follows: Schedule of Significant Changes in Contract assets
|  | 2023 |  |  | 2022 |
|  | Fiscal year ended April 30, |
|  | 2023 |  |  | 2022 |
|  | (in thousands) |
Transferred to receivables from contract assets recognized at the beginning of the period |  | $ | (1,768 | ) |  | $ | (190 | )
Revenue recognized and not billed as of the end of the period |  |  | 1,534 |  |  |  | 386 |
Net change in contract assets |  | $ | (234 | ) |  | $ | 196 |
Schedule of Significant Changes in Contract Liabilities | Schedule of Significant Changes in Contract Liabilities Significant changes in the contract liabilities balances during the period are as follows:
|  | 2023 |  |  | 2022 |
|  | Fiscal year ended April 30, |
|  | 2023 |  |  | 2022 |
|  | (in thousands) |
Revenue recognized that was included in the contract liabilities balance as of the beginning of the period |  | $ | (574 | ) |  | $ | — |
Contract liabilities obtained in acquisition of MAR |  |  | — |  |  |  | (203 | )
Payments collected for which revenue has not been recognized |  |  | 1,823 |  |  |  | 129 |
Net change in contract liabilities |  | $ | 1,249 |  |  | $ | (74 | )

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- Definition Contract With Customer Asset [Table Text Block] + References No definition available. + Details
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- Definition Contract With Customer Liabilities [Table Text Block] + References No definition available. + Details
Name: | OPTT_ContractWithCustomerLiabilitiesTableTextBlock
Namespace Prefix: | OPTT_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | OPTT_DisclosureAccountReceivableContractAssetsAndContractLiabilitiesAbstract
Namespace Prefix: | OPTT_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Schedule of accounts receivable contract assets and contract liabilities [Table Text Block] + References No definition available. + Details
Name: | OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock
Namespace Prefix: | OPTT_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration