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Schedule of Significant Changes in Contract assets and Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	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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Increase decrease in contract with customer assets.

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Revenue recognized and not billed as of the end of the period.

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Revenue recognized and not billed as of the end of the period.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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