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Note I - Stock-based Compensation (Tables)
9 Months Ended
Jan. 31, 2022
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, 2031

 

Shares available for grant at January 31, 2022

  215,000 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Nine Months Ended
January 31,

 
  

2022

  

2021

 

Expected term (years)

  5.5   5.5 

Risk-free interest rate

  0.86%  0.36%

Volatility

  51%  50%

Dividend yield

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

Nine Months Ended
January 31,

 

(Dollars in thousands)

 

2022

  

2021

 
         

Options exercised

  57,000   107,000 

Cash received from option exercises

 $274  $4,731 

Intrinsic value of options exercised

 $4,924  $4,868