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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Short term investments	$ 18,209	$ 2,115
Allowance for doubtful accounts	$ 36	$ 38
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, shares (in shares)	436,830	383,279

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

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Face amount or stated value per share of common stock.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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