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Note J - Commitments and Contingencies (Tables)
 6 Months Ended
Oct. 31, 2019
Notes Tables  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Maturity of lease liabilities    
2020 (remaining)   $
3,366
  
2021    
6,543
  
2022    
6,337
  
2023    
6,273
  
2024    
5,703
  
Thereafter   $
23,030
  
Total undiscounted operating lease payments    
51,252
  
Less: imputed interest    
(13,578
 )
Present value of operating lease liabilities   $
37,674