Note M - Supplemental Cash Flow Information - Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Supplemental disclosures:
Interest paid	$ 4,069	$ 3,536	$ 2,885
Income taxes paid, net	8,435	7,811	13,409
Non-cash transactions:
Inventory acquired in repossession and payment protection plan claims	42,743	43,766	44,838
Purchase of property and equipment using the issuance of debt		550
Loss accrued on disposal of property and equipment	797	300
Net settlement option exercises	$ 714