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Accounts Receivable, Contract Assets and Contract Liabilities | 3 Months Ended
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Jul. 31, 2023
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, 2023 |  |  | April 30, 2023 |  |  | April 30, 2022 |
|  | (in thousands) |
Accounts receivable |  | $ | 730 |  |  | $ | 745 |  |  | $ | 482 |
Contract assets |  | $ | 293 |  |  | $ | 152 |  |  | $ | 386 |
Contract liabilities |  | $ | 1,207 |  |  | $ | 1,378 |  |  | $ | 129 |
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 is primarily a result of consulting services projects for which revenue was recognized in the current period but has not yet been billed due to the terms of the project agreements. No impairments to contract assets were incurred during the three months ended July 31, 2023 or July 31, 2022. 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, 2023 |  |  | Three months ended July 31, 2022 |
|  | (in thousands) |
Transferred to receivables from contract assets recognized |  | $ | (377 | ) |  | $ | (434 | )
Revenue recognized and not billed |  |  | 518 |  |  |  | 714 |
Net change in contract assets |  | $ | 141 |  |  | $ | 280 |
Contract Liabilities Contract liabilities consist of amounts invoiced to customers in excess of revenue recognized. The decrease in contract liabilities is primarily due to recognizing revenue on the DOE Phase II contract for which the Company was paid in prior periods. 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, 2023 |  |  | Three months ended July 31, 2022 |
|  | (in thousands) |
Revenue recognized |  | $ | (321 | ) |  | $ | (91 | )
Payments collected for which revenue has not been recognized |  |  | 150 |  |  |  | 63 |
Net change in contract liabilities |  | $ | (171 | ) |  | $ | (28 | )

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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_
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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