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Note L - Commitments and Contingencies (Tables)
12 Months Ended
Apr. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Years Ending   Amount
April 30,   (In thousands)
     
  2019     $
6,419
 
  2020      
6,317
 
  2021      
5,938
 
  2022      
5,638
 
  2023      
5,556
 
  Thereafter      
20,648
 
  Total     $
50,516