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Note K - Stock-based Compensation Plans - Options Exercised (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Statement [Line Items]
Options Exercised (in shares)	28,000	94,000	131,350
Cash Received from Options Exercised	$ 1,216	$ 591	$ 5,120
Intrinsic Value of Options Exercised	$ 1,412	$ 7,124	$ 7,894

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