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Note E - Accrued Liabilities (Tables)
 12 Months Ended
Apr. 30, 2018
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
(In thousands)   April 30, 2018   April 30, 2017
         
Employee compensation   $
6,539
     $
5,406
  
Cash overdrafts (see Note B)    
506
      
669
  
Deferred sales tax (see Note B)    
3,270
      
2,894
  
Reserve for PPP claims    
2,101
      
1,884
  
Other    
3,544
      
2,943
  
                 
Accrued liabilities   $
15,960
     $
13,796