Note H - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Statement [Line Items]
Current	$ (3,504)	$ 18,871	$ 23,273
Deferred	8,866	8,750	7,239
Total	$ 5,362	$ 27,621	$ 30,512