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Schedule of Significant Changes in Contract assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Account Receivable Contract Assets And Contract Liabilities    
Transferred to receivables from contract assets recognized at the beginning of the period $ (190) $ (251)
Revenue recognized and not billed as of the end of the period 386 190
Net change in contract assets 196 (61)
Revenue recognized that was included in the contract liabilities balance as of the beginning of the period (159)
Transferred to contract assets from contract liabilities recognized at the beginning of the period (6)
Contract liabilities obtained in acquisition on MAR (203)
Payments collected for which revenue has not been recognized 129
Net change in contract liabilities $ (74) $ (165)