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Note I - Stock-based Compensation (Tables)
 9 Months Ended
Jan. 31, 2020
Notes Tables  
Stock Option Plan Comparison [Table Text Block]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Nine Months Ended
January 31,
    2020   2019
Expected term (years)    
5.5
      
5.5
  
Risk-free interest rate    
1.75
 %    
2.79
 %
Volatility    
39
 %    
36
 %
Dividend yield    
-
      
-
  
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block]
    Nine Months Ended
January 31,
(Dollars in thousands)   2020   2019
         
Options exercised    
112,250
      
224,500
  
Cash received from option exercises   $
2,849
     $
4,373
  
Intrinsic value of options exercised   $
6,861
     $
8,506