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Account Receivable, Contract Assets, and Contract Liabilities (Tables) | 12 Months Ended
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Apr. 30, 2024
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
|  | 2024 |  |  | 2023 |  |  | 2022 |
|  | Fiscal year ended April 30, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
|  | (in thousands) |
Accounts receivable |  | $ | 796 |  |  | $ | 745 |  |  | $ | 482 |
Contract assets |  |  | 18 |  |  |  | 152 |  |  |  | 386 |
Contract liabilities |  |  | 302 |  |  |  | 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
|  | 2024 |  |  | 2023 |
|  | Fiscal year ended April 30, |
|  | 2024 |  |  | 2023 |
|  | (in thousands) |
Transferred to receivables from contract assets recognized during the period |  | $ | (1,879 | ) |  | $ | (1,768 | )
Revenue recognized and not billed during the period |  |  | 1,745 |  |  |  | 1,534 |
Net change in contract assets |  | $ | (134 | ) |  | $ | (234 | )
Schedule of Significant Changes in Contract Liabilities | Significant changes in the contract liabilities balances during the period are as follows: Schedule of Significant Changes in Contract Liabilities
|  | 2024 |  |  | 2023 |
|  | Fiscal year ended April 30, |
|  | 2024 |  |  | 2023 |
|  | (in thousands) |
Revenue recognized |  | $ | (2,424 | ) |  | $ | (574 | )
Payments collected for which revenue has not been recognized |  |  | 1,348 |  |  |  | 1,823 |
Net change in contract liabilities |  | $ | (1,076 | ) |  | $ | 1,249 |

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- Definition Contract With Customer Asset [Table Text Block] + References No definition available. + Details
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Period Type: | duration

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

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- References No definition available. + Details
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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