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Note 6 - Common Stock Warrants (Tables)
9 Months Ended
Sep. 30, 2022
Table Text Block [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights

The following table summarizes warrant activity for the nine months ended September 30, 2022:

 

 

 

Number of
Warrants

 

 

Weighted
Average
Exercise Price

 

 

Weighted
Average
Remaining
Contractual
Life (Years)

 

Warrants outstanding, December 31, 2021

 

 

7,181,741

 

 

$

5.96

 

 

 

4.45

 

Granted

 

 

119,827,491

 

 

 

0.28

 

 

 

3.04

 

Exercised

 

 

(3,994,302

)

 

 

3.88

 

 

 

4.11

 

Forfeited, expired or cancelled

 

 

(90,018

)

 

 

81.37

 

 

 

 

Warrants outstanding, September 30, 2022

 

 

122,924,912

 

 

 

0.44

 

 

 

3.04