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Note 6 - Warrants (Tables)
12 Months Ended
Dec. 31, 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, 2020

  32,980,989  $0.131.00  $0.29     

Granted

  11,096,992   0.120.14   0.21     

Exercised

  (1,283,333)  0.120.14   0.13     

Expired

  (6,029,086)  0.120.70   0.30     

Balance, December 31, 2021

  36,765,562  $0.131.00  $0.27     

Granted

  27,137,048   0.120.14   0.23     

Exercised

              

Expired

  (14,879,152)  0.120.48   0.24     

Balance, December 31, 2022

  49,023,398  $

0.13

1.00  $0.26  $691,000 
Schedule Of Assumptions Used To Determine Fair Value Of Warrants [Table Text Block]
  

2022

  

2021

 

Risk free interest rate

  3.693.88%

 

  0.71% 

Expected volatility

  40%

 

  100% 

Expected dividend yield

      

Forfeiture rate

      

Expected life in years

  3   .55