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Note 9 - Warrants (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Shares

  

Wtd. Avg.

Exercise Price

 

Outstanding as of December 31, 2020

  79,100  $4.75 

Exercised

  (79,100)  4.75 

Outstanding and exercisable as of June 30, 2021

  -  $-