Note M - Supplemental Cash Flow Information - Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Supplemental disclosures:
Interest paid	$ 7,259	$ 5,599	$ 4,069
Income taxes paid, net	11,022	11,092	8,435
Non-cash transactions:
Inventory acquired in repossession and payment protection plan claims	51,514	42,274	42,743
Purchase of property and equipment using the issuance of debt		1,151
Loss accrued on disposal of property and equipment	29		797
Net settlement option exercises	$ 2,848	$ 3,859	$ 2,130