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Accounts Receivable, Contract Assets and Contract Liabilities | 9 Months Ended
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Jan. 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
|  | January 31, 2025 |  |  | April 30, 2024 |  |  | April 30, 2023 |
|  | (in thousands) |
Accounts receivable |  | $ | 1,626 |  |  | $ | 796 |  |  | $ | 745 |
Contract assets |  | $ | 478 |  |  | $ | 18 |  |  | $ | 152 |
Contract liabilities |  | $ | — |  |  | $ | 302 |  |  | $ | 1,378 |
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 increase in contract assets from year end is primarily a result of consulting services projects for which revenue was recognized in the current period but has not yet been billed. No impairments to contract assets were incurred during the nine months ended January 31, 2025 and 2024. Significant changes in the contract assets balances during the period were as follows: Schedule of Significant Changes in Contract Assets
|  | Nine months ended January 31, 2025 |  |  | Nine months ended January 31, 2024 |
|  | (in thousands) |
Transferred to receivables from contract assets recognized |  | $ | (600 | ) |  | $ | (1,469 | )
Revenue recognized and not billed |  |  | 1,060 |  |  |  | 1,598 |
Net change in contract assets |  | $ | 460 |  |  | $ | 129 |
Contract Liabilities Contract liabilities consist of amounts invoiced to customers in excess of revenue recognized. The decrease in contract liabilities from year end is primarily due to converting previous payments collected to recognized revenue in the current year. Significant changes in the contract liabilities balances during the period are as follows: Schedule of Significant Changes in Contract Liabilities
|  | Nine months ended January 31, 2025 |  |  | Nine months ended January 31, 2024 |
|  | (in thousands) |
Revenue recognized |  | $ | (1,830 | ) |  | $ | (1,312 | )
Payments collected for which revenue has not been recognized |  |  | 1,528 |  |  |  | 802 |
Net change in contract liabilities |  | $ | (302 | ) |  | $ | (510 | )

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