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Accounts Receivable, Contract Assets and Contract Liabilities | 3 Months Ended
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Jul. 31, 2025
Accounts Receivable Contract Assets And Contract Liabilities |
Accounts Receivable, Contract Assets and Contract Liabilities | (3) 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
|  | July 31, 2025 |  |  | April 30, 2025 |  |  | April 30, 2024 |
|  | (in thousands) |
Accounts receivable |  | $ | 2,207 |  |  | $ | 1,191 |  |  | $ | 796 |
Contract assets |  | $ | 555 |  |  | $ | 1,088 |  |  | $ | 18 |
Contract liabilities |  | $ | 135 |  |  | $ | — |  |  | $ | 302 |
Contract Assets Contract assets include unbilled amounts typically resulting from arrangements whereby the right to payment is conditional on completing additional tasks or services for a performance obligation. The decrease in contract assets from year end is primarily a result of being able to contractually bill on active projects for which revenue was recognized in the prior period but was not yet been billed as of the beginning of the period. No impairments to contract assets were incurred during the three months ended July 31, 2025 and 2024. Significant changes in the contract assets balances during the period were as follows: Schedule of Significant Changes in Contract Assets
|  | Three months ended July 31, 2025 |  |  | Three months ended July 31, 2024 |
|  | (in thousands) |
Transferred to receivables from contract assets recognized |  | $ | (644 | ) |  | $ | (104 | )
Revenue recognized and not billed |  |  | 111 |  |  |  | 563 |
Net change in contract assets |  | $ | (533 | ) |  | $ | 459 |
Contract Liabilities Contract liabilities consist of amounts invoiced to customers in excess of revenue recognized. The increase in contract liabilities from year end is primarily due to collecting payments for jobs we cannot contractually recognize revenue on the current year. Significant changes in the contract liabilities balances during the period are as follows: Schedule of Significant Changes in Contract Liabilities
|  | Three months ended July 31, 2025 |  |  | Three months ended July 31, 2024 |
|  | (in thousands) |
Revenue recognized |  | $ | (115 | ) |  | $ | (545 | )
Payments collected for which revenue has not been recognized |  |  | 250 |  |  |  | 689 |
Net change in contract liabilities |  | $ | 135 |  |  | $ | 144 |

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- Definition Account receivable contract assets and contract liabilities [Text Block] + References No definition available. + Details
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Namespace Prefix: | OPTT_
Data Type: | dtr-types:textBlockItemType
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Period Type: | duration

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