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Note 6 - Warrants (Tables)
3 Months Ended
Mar. 31, 2023
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, 2022

  49,023,398  $0.131.00  $0.26     

Granted

  7,512,000  0.210.29   0.25     

Expired

  (4,684,986

)

 0.190.35   0.21     

Balance, March 31, 2023

  51,850,412  $0.131.00  $0.26  $122,000 
                  

Balance, December 31, 2021

  36,765,562  $0.161.00  $0.27     

Granted

  10,393,936  0.200.25   0.22     

Expired

  (388,889

)

  0.22    0.22     

Balance, March 31, 2022

  46,770,549  $0.141.00  $0.29     
Schedule Of Assumptions Used To Determine Fair Value Of Warrants [Table Text Block]
  

2023

  

2022

 

Risk free interest rate

 3.884.27%  3.693.88%

 

Expected volatility

 4095%   40% 

 

Expected dividend yield

   —     —  

Forfeiture rate

   —     —  

Expected life in years

  35   3