Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Common Stock (Tables)

v3.21.1
Note 11 - Common Stock (Tables)
3 Months Ended
Mar. 31, 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
 
May 2016
 
Common Shares
 
May 11, 2021
  $
7,740.00
     
6
 
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
  $
3.40
     
285,632
 
November 2019
 
Common Shares
 
November 26, 2024
  $
18.36
     
989,379
 
April 2020
 
Common Shares
 
April 21, 2025
  $
3.40
     
413,210
 
January 2021
 
Common Shares
 
January 19, 2026
  $
3.40
     
8,104,880
 
   
 
 
 
   
 
     
9,793,605
 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
   
Immediately
 
Immediately
 
Series B Warrants
 
before Modification
 
After Modification
         
Exercise price        
Common stock 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%