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Schedule of Significant Changes in Contract assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2022 | Jul. 31, 2021
Account Receivable Contract Assets And Contract Liabilities |  |
Transferred to receivables from contract assets recognized at the beginning of the period | $ (434) |
Revenue recognized and not billed as of the end of the period | 714 |
Net change in contract assets | 280 |
Revenue recognized that was included in the contract liabilities balance as of the beginning of the period | (91) |
Payments collected for which revenue has not been recognized | 63 |
Net change in contract liabilities | $ (28) |

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