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Note 12 - Warrants (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Six Months Ended June 30,

 
  

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

  -  $-   -  $-