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Note 8 - Warrants (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Shares

  

Wtd. Avg.

Exercise

Price

 

Outstanding at December 31, 2019

  3,959,005  $4.33 

Exercised

  (3,876,405

)

  4.33 

Outstanding at June 30, 2020

  82,600  $4.75