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Schedule of Accounts Receivable, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021
Account Receivable And Contract Assets
Accounts receivable	$ 446	$ 350
Contract assets	$ 304	$ 190

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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, 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, classified as current.

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