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Note 9 - Warrants (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

2021

  

2020

  

2019

 
  

Shares

  

Wtd. Avg.

Exercise Price

  

Shares

  

Wtd. Avg.

Exercise Price

  

Shares

  

Wtd. Avg.

Exercise Price

 

Outstanding at beginning of year

  79,100  $4.75   3,959,005  $4.33   4,080,005  $4.35 

Exercised

  (79,100)  4.75   (3,879,905)  4.33   (121,000)  4.75 

Outstanding and exercisable at end of year

  -  $-   79,100  $4.75   3,959,005  $4.33