Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Common Stock (Tables)

v3.20.2
Note 11 - Common Stock (Tables)
6 Months Ended
Jun. 30, 2020
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
  $
400.00
     
754
 
March 2015
 
Common Shares
 
March 26, 2025
  $
272.00
     
14
 
May 2015
 
Common Shares
 
May 12, 2025
  $
424.00
     
362
 
December 2015
 
Common Shares
 
December 16, 2025
  $
560.00
     
267
 
April 2016
 
Common Shares
 
April 1, 2026
  $
608.00
     
250
 
May 2016
 
Common Shares
 
May 11, 2021
  $
774.00
     
50
 
June 2016
 
Common Shares
 
June 20, 2026
  $
498.00
     
1,004
 
May 2017
 
Common Shares
 
May 25, 2027
  $
950.00
     
2,220
 
November 2019
 
Common Shares
 
November 26, 2020
  $
0.61
     
1,540,829
 
November 2019
 
Common Shares
 
November 26, 2024
  $
0.61
     
7,080,390
 
November 2019
 
Common Shares
 
November 26, 2024
  $
1.836
     
9,893,776
 
April 2020
 
Common Shares
 
April 21, 2025
  $
0.6371
     
5,063,374
 
   
 
 
 
   
 
     
23,583,290
 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
   
Immediately
   
Immediately
 
   
before Modification
   
After Modification
 
             
Exercise price
 
$1.55
   
$0.61
 
Common stock price
 
$0.63
   
$0.63
 
Expected term (in years)
 
2.8
   
2.8
 
Average volatility
 
97%
   
97%
 
Risk-free interest rate
 
0.27%
   
0.27%
 
Dividend yield
 
0%
   
0%