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Note K - Supplemental Cash Flow Information - Supplemental Cash Flow Disclosures (Details) - USD ($)
9 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Supplemental disclosures:    
Interest paid $ 3,978,000 $ 3,040,000
Income taxes paid, net 7,534,000 4,726,000
Non-cash transactions:    
Inventory acquired in repossession and payment protection plan claims 30,312,000 30,610,000
Property and equipment acquired via capital lease 1,196
Loss incurred on disposal of property and equipment $ (300)