XML 45 R34.htm IDEA: XBRL DOCUMENT v3.21.2
Note 11 - Warrant Liability (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]

Assumptions

 

2019 Domestic

Warrants

  

2019 Foreign

Warrants

 

Expected price volatility

  178

%

  178

%

Expected term (in years)

  4.57   4.57 

Risk-free interest rate

  0.25

%

  0.27

%

Dividend yield

  0.00

%

  0.00

%

Weighted-average fair value of warrant

 $1.18  $1.54 

Expected price volatility

  186

%

Expected term (in years)

  4.05 

Risk-free interest rate

  0.22

%

Dividend yield

  0.00

%

Weighted-average fair value of warrants

 $1.17