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

Issuance Date

 

Exercisable

for

 

Expiration

Date

 

 

Exercise

Price

 

Number of

Shares

Outstanding

Under

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 

Issuance Date

 

Exercisable

for

 

Expiration

Date

 Exercise

Price

  

Number of

Shares

Outstanding

Under

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

 $6.10  325,632 

November 2019

 

Common Shares

 

November 26, 2024

 $18.36  989,379 

April 2020

 

Common Shares

 

April 21, 2025

 $6.37  413,210 
          1,728,725 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
 

Immediately

before

Modification

 

 

 

Immediately

After

Modification

 
       

Exercise price

$15.50 $6.10 

Common stock price

$6.30 $6.30 

Expected term (in years)

 2.8  2.8 

Average volatility

 97

%

 97

%

Risk-free interest rate

 0.27

%

 0.27

%

Dividend yield

 0

%

 0

%

Series B Warrants

 

 

Immediately

before

Modification

  

 

Immediately

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

%

Series A-2 and B-2 Warrants

 

 

Immediately

before

Modification

  

 

Immediately

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

%

Series B, A-2 and B-2 Warrants

 

 

Immediately

before

Modification

  

 

Immediately

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

%