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Schedule of Accounts Receivable, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2023	Apr. 30, 2022
Account Receivable Contract Assets And Contract Liabilities
Accounts receivable	$ 706	$ 482
Contract assets	93	386
Contract liabilities	$ 1,334	$ 129

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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

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