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Note M - Supplemental Cash Flow Information (Details) - Supplemental cash flow disclosures (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Supplemental disclosures:      
Interest paid $ 2,884 $ 2,218 $ 2,727
Income taxes paid, net 17,800 16,479 13,857
Non-cash transactions:      
Inventory acquired in repossession and payment protection plan claims $ 39,657 $ 37,142 $ 29,636