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