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Note 9 - Warrants (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Three Months Ended March 31,

 
  

2022

  

2021

 
  Shares  

Wtd. Avg.

Exercise Price

  Shares  

Wtd. Avg.

Exercise Price

 

Beginning balance

  -  $-   79,100  $4.75 

Exercised

  -   -   (79,100)  4.75 

Ending balance

  -  $-   -  $-