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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Short term investments	$ 7,240	$ 28,965
Allowance for doubtful accounts	$ 36	$ 31
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	10,000,000	10,000,000
Treasury Stock, Common, Shares	565,460	490,157

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Amount of allowance for credit loss on accounts receivable, classified as current.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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