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Note 8 - Common Stock Warrants (Tables)
12 Months Ended
Dec. 31, 2021
Table Text Block [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights

The following table summarizes warrant activity for the year ended December 31, 2021:

 

 

 

Number of
Warrants

 

 

Weighted
Average
Exercise Price

 

 

Weighted
Average
Remaining
Contractual
Life (Years)

 

Warrants outstanding, December 31, 2020

 

 

195,712

 

 

 

21.20

 

 

 

6.60

 

Granted

 

 

7,572,191

 

 

 

3.86

 

 

 

4.63

 

Seneca warrants

 

 

749,792

 

 

 

21.07

 

 

 

2.58

 

Exercised

 

 

(1,309,266

)

 

 

3.88

 

 

 

4.86

 

Settled

 

 

(20,313

)

 

 

57.46

 

 

 

2.43

 

Forfeited, expired or cancelled

 

 

(6,375

)

 

 

18.37

 

 

 

2.74

 

Warrants outstanding, December 31, 2021

 

 

7,181,741

 

 

 

5.96

 

 

 

4.45