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Note 6 - Warrants (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Warrants outstanding

  

Weighted average price per share

  

Weighted average remaining life

  

Aggregate intrinsic value(1)

 
Balance, December 31, 2022  49,023,398  $0.26         
Granted  7,512,000  $0.25         
Expired  (4,684,986) $0.21         
Balance, March 31, 2023  51,850,412  $0.26  $2.4  $122,000 
                 

Balance, December 31, 2023

  51,590,300  $0.27         

Granted

  3,218,422  $0.25         

Expired

  (406,278) $0.37         

Exercised

  (600,000) $0.25         

Balance, March 31, 2024

  53,802,444  $0.26  $2.0  $4,021,000 
Schedule Of Assumptions Used To Determine Fair Value Of Warrants [Table Text Block]
  

2024

  

2023

 

Risk free interest rate

  4.04 – 5.28%  3.88 – 4.27%

Expected volatility

  6487%  4095%

Expected dividend yield

      

Forfeiture rate

      

Expected life in years

  .5 – 5   .5 – 5