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Note 9 - Shareholders' Equity, Redeemable Convertible Preferred Stock, Options and Warrants (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Warrants

 

Outstanding Shares

  

Weighted Average Exercise

 

Outstanding at December 31, 2021

  7,065,000  $0.11 

Granted

      

Exercised

  (515,000)  0.12 

Forfeited

  (6,550,000)  0.11 

Outstanding at December 31, 2022

      

Granted

      

Exercised

      

Forfeited

      

Outstanding at December 31, 2023

    $ 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]

Stock Options

 Outstanding Shares  

Weighted Average Exercise Price

  

Weighted Average Remaining Contractual Life

  

Average Intrinsic Value

 

Outstanding at December 31, 2021

  20,777,500   0.06       627,615 

Granted

  8,150,000   0.09         

Exercised

  (1,200,000)  0.04       57,000 

Forfeited

  (1,734,000)  0.08         

Outstanding at December 31, 2022

  24,993,500   0.07        

Granted

  3,100,000   0.04         

Exercised

              

Forfeited

  (3,306,000)  0.08         

Outstanding at December 31, 2023

  24,787,500   0.05   5.4   17,000 

Exercisable at December 31, 2023

  19,372,500  $0.05   4.6  $16,000 
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

Non-Vested Restricted Stock Units

 

Number of restricted stock units

 

Weighted average grant-date fair value

Outstanding at December 31, 2020

 

 

$ —

Granted

 

 

Exercised

 

 

Forfeited

 

 

Outstanding at December 31, 2021

 

 

Granted

 

 

Vested

 

 

Forfeited / Cancelled

 

 

Outstanding at December 31, 2022

 

 

Granted

 

7,250,000

 

0.04

Vested

 

(250,000

)

0.04

Forfeited / Cancelled

 

 

Outstanding at December 31, 2023

 

7,000,000

 

$ 0.04