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Note 3 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 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

    19,600       3.99  

Exercised

    16,665       3.64  

Canceled/expired/forfeited

    -       3.62  

Options outstanding, September 30, 2022

    430,515       3.52  

Options exercisable, September 30, 2022

    410,915       3.50