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Note 6 - Warrants (Tables)
6 Months Ended
Jun. 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

  19,604,796  0.200.29   0.24     

Expired

  (4,016,754

)

 0.190.48   0.35     

Balance, June 30, 2022

  52,353,544  $0.141.00  $0.25  $741,000 
                   

Balance, December 31, 2020

  32,980,989  $0.161.00  $0.29     

Issued

  7,088,094  0.140.26   0.20     

Expired

  (1,046,528

)

 0.190.35   0.24     

Balance, June 30, 2021

  39,022,555  $0.141.00  $0.27