Note K - Supplemental Cash Flow Information - Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Supplemental disclosures:
Interest paid	$ 2,496	$ 1,980
Income taxes paid, net	6,080	3,793
Non-cash transactions:
Inventory acquired in repossession and payment protection plan claims	20,096	19,651
Loss accrued on disposal of property and equipment		$ 400