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Note 7 - Warrants and Registration Rights Agreements (Tables)
12 Months Ended
Dec. 31, 2022
Warrants and Rights Note Disclosure [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

 

 

  Shares

 

 

Weighted Average

 

 

 

Underlying Warrants

 

 

Exercise Price

 

Outstanding, December 31, 2020

 

 

6,034,702

 

 

$

0.07

 

 

 

 

 

 

 

 

 

 

Granted

 

 

-

 

 

 

-

 

Canceled / Expired

 

 

(500,000

)

 

 

-

 

Exercised 

 

 

(1,034,702

)

(1) 

 

-

 

 

 

 

 

 

 

 

 

 

Outstanding, December 31, 2021

 

 

4,500,000

 

 

$

0.01

 

Granted

 

 

-

 

 

 

-

 

Canceled / Expired

 

 

-

 

 

-

 

Exercised

 

 

-

  

 

-

 

 

 

 

 

 

 

 

 

 

Outstanding, December 31, 2022

 

 

4,500,000

 

 

$

0.01