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Note 3 - Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 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

  -   - 

Canceled/expired/forfeited

  -   - 

Options outstanding, March 31, 2022

  427,580   3.50 

Options exercisable, March 31, 2022

  322,580   3.47