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Note M - Supplemental Cash Flow Information (Tables)
 12 Months Ended
Apr. 30, 2018
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
    Years Ended April 30,
(in thousands)   2018   2017   2016
Supplemental disclosures:                        
Interest paid   $
5,599
     $
4,069
     $
3,536
  
Income taxes paid, net    
11,092
      
8,435
      
7,811
  
                         
Non-cash transactions:                        
Inventory acquired in repossession and payment protection plan claims    
42,274
      
42,743
      
43,766
  
Purchase of property and equipment using the issuance of debt    
1,151
      
-
      
550
  
Loss accrued on disposal of property and equipment    
-
      
797
      
300
  
Net settlement option exercises    
3,859
      
2,130
      
-