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Schedule of Accounts Receivable, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Account Receivable Contract Assets And Contract Liabilities
Accounts receivable	$ 745	$ 482	$ 350
Contract assets	152	386	190
Contract liabilities	$ 1,378	$ 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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