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Note L - Commitments and Contingencies (Tables)
12 Months Ended
Apr. 30, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Years Ending   Amount
April 30,   (In thousands)
     
2018   $
5,902
 
2019    
5,675
 
2020    
5,528
 
2021    
5,131
 
2022    
4,827
 
Thereafter    
17,620
 
         
Total   $
44,683