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Note I - Stock-based Compensation (Tables)
6 Months Ended
Oct. 31, 2020
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, 2030 

Shares available for grant at October 31, 2020

  245,000 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Six Months Ended
October 31,

 
  

2020

  

2019

 

Expected term (years)

  5.5   5.5 

Risk-free interest rate

  0.36%  2.28%

Volatility

  50%  39%

Dividend yield

  -   - 
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block]
  

Six Months Ended
October 31,

 

(Dollars in thousands)

 

2020

  

2019

 
         

Options exercised

  55,566   39,000 

Cash received from option exercises

 $2,548  $864 

Intrinsic value of options exercised

 $2,439  $2,083