Note K - Supplemental Cash Flow Information - Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Supplemental disclosures:
Interest paid	$ 3,990	$ 3,122
Income taxes paid, net	5,975	4,109
Non-cash transactions:
Inventory acquired in repossession and payment protection plan claims	24,968	23,348
Net settlement option exercises	$ 489	$ 2,359