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Note 7 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Number of

  

Weighted

 
  

Common Stock

  

Average

 
  

Warrants

  

Exercise Price

 

Balance as of December 31, 2021

  2,424,724  $6.36 

Warrants for common stock sold

      

Warrants for common stock exercised

      

Balance as of June 30, 2022

  2,424,724  $6.36