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

Weighted

     
           

average

  

Aggregate

 
  

Warrants

  

Exercise

  

price per

  

Intrinsic

 
  

outstanding

  

price per share

  

share

  

value(1)

 
                  

Balance, December 31, 2021

  36,765,502  $0.161.00  $0.27     

Issued

  27,137,048  0.190.33   0.23     

Expired

  (10,273,722

)

 0.190.48   0.25     

Balance, September 30, 2022

  53,628,828  $0.141.00  $0.26  $2,094,000 
                  

Balance, December 31, 2020

  32,980,989  $0.161.00  $0.29     

Issued

  7,865,872  0.14-0.27   0.20     

Exercised

  (416,667

)

 0.14   0.14     

Expired

  (2,743,406

)

 0.12-0.70   0.59     

Balance, September 30, 2021

  37,686,788  $0.121.00  $0.27