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Note 3 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
           

Weighted Average

 
           

Exercise Price

 
   

Options

   

Per Option

 
                 

Options outstanding, December 31, 2021

    427,580     $ 3.50  

Granted to employees and non-employee directors

    -       -  

Exercised

    8,332       3.62  

Canceled/expired/forfeited

    -       -  

Options outstanding, June 30, 2022

    419,248       3.50  

Options exercisable, June 30, 2022

    404,248       3.50