Note J - Supplemental Cash Flow Information (Details) - Supplemental cash flow disclosures (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Supplemental disclosures:
Interest paid	$ 801	$ 665
Income taxes paid, net	378	1,286
Non-cash transactions:
Inventory acquired in repossession and payment protection plan claims	$ 10,382	$ 9,200