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Note L - Commitments and Contingencies (Tables)
12 Months Ended
Apr. 30, 2020
Notes Tables  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Years Ending   Amount
April 30,     (In thousands)
     
2021   $
6,831
2022    
6,646
2023    
6,570
2024    
6,043
2025    
5,876
Thereafter    
54,407
       
Total undiscounted operating lease payments    
86,373
Less: imputed interest    
23,563
       
Present value of operating lease liabilities   $
62,810