XML 37 R26.htm IDEA: XBRL DOCUMENT v3.21.2
Note 11 - Common Stock (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
          

Number of

 
          

Shares

 
          

Outstanding

 
  

Exercisable

 

Expiration

 

Exercise

  

Under

 

Issuance Date

 

for

 

Date

 

Price

  

Warrants

 
             

February 2015

 

Common Shares

 

February 17, 2025

 $4,000.00   79 

March 2015

 

Common Shares

 

March 26, 2025

 $2,720.00   2 

May 2015

 

Common Shares

 

May 12, 2025

 $4,240.00   37 

December 2015

 

Common Shares

 

December 16, 2025

 $5,600.00   31 

April 2016

 

Common Shares

 

April 1, 2026

 $6,080.00   25 

June 2016

 

Common Shares

 

June 20, 2026

 $4,980.00   101 

May 2017

 

Common Shares

 

May 25, 2027

 $9,500.00   223 

November 2019

 

Common Shares

 

November 26, 2024

 $18.36   989,379 

November 2019

 

Common Shares

 

November 26, 2024

 $2.82   285,632 

April 2020

 

Common Shares

 

April 21, 2025

 $2.82   413,210 

January 2021

 

Common Shares

 

January 19, 2026

 $3.40   8,104,880 
           9,793,599 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

Immediately

  

Immediately

 

Series B Warrants

 

before

Modification

  

After

Modification

 
         

Exercise price

 $6.10  $3.40 

Common stock price

 $3.19  $3.19 

Expected term (in years)

  3.9   3.9 

Average volatility

  90%  90%

Risk-free interest rate

  0.33%  0.33%

Dividend yield

  0%  0%
  

Immediately

  

Immediately

 

Series A-2 and B-2 Warrants

 

before

Modification

  

After

Modification

 
         

Exercise price

 $6.37  $3.40 

Common stock price

 $3.19  $3.19 

Expected term (in years)

  4.3   4.3 

Average volatility

  90%  90%

Risk-free interest rate

  0.33%  0.33%

Dividend yield

  0%  0%
  

Immediately

  

Immediately

 

Series B, A-2 and B-2 Warrants

 

before

Modification

  

After

Modification

 
         

Exercise price

 $3.40  $2.82 

Common stock price

 $3.01  $3.01 

Expected term (in years)

  3.6   3.6 

Average volatility

  80%  80%

Risk-free interest rate

  0.58%  0.58%

Dividend yield

  0%  0%