XML 34 R27.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Note I - Stock-based Compensation (Tables)
 6 Months Ended
Oct. 31, 2019
Notes Tables  
Stock Option Plan Comparison [Table Text Block]
    Restated
Option Plan
Minimum exercise price as a percentage of fair market value at date of grant    
100
 %
Last expiration date for outstanding options    
May 1, 2029
  
Shares available for grant at October 31, 2019    
275,000
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Six Months Ended
October 31,
    2019   2018
Expected term (years)    
5.5
      
5.5
  
Risk-free interest rate    
2.28
 %    
2.79
 %
Volatility    
39
 %    
36
 %
Dividend yield    
-
      
-
  
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block]
    Six Months Ended
October 31,
(Dollars in thousands)   2019   2018
Options exercised    
39,000
      
220,750
  
Cash received from option exercises   $
864
     $
4,294
  
Intrinsic value of options exercised   $
2,083
     $
8,317