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Note L - Commitments and Contingencies (Tables)
12 Months Ended
Apr. 30, 2019
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Years Ending
April 30,
 
 
Amount
(In thousands)
     
  2020     $
6,681
 
  2021      
6,323
 
  2022      
6,059
 
  2023      
5,991
 
  2024      
5,403
 
  Thereafter      
17,616
 
             
  Total     $
48,073