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Note 7 - Embedded Derivatives Liabilities (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Issuance

Date

  

Expiration

Date

  

Exercise

Price as of

September 30, 2021

  

Shares

Underlying

Warrants on

Issuance Date

  

Shares Issued

upon Warrant

Exercises as of

September 30, 2021

  

Shares

Underlying

Warrants

Outstanding as of

September 30, 2021

 
                         

Series K Warrants

 

2/17/2017

  

2/17/2022

  $2.00   315,986   308,860   7,126 
Series 2020-A Warrants (1) 7/6/2020  7/6/2025  $0.60   30,000,000   29,909,392   90,608 
                         
               30,315,986   30,218,252   97,734 
Exercise of Warrants [Table Text Block]
  

Common Stock Issued

  

Proceeds

 
Series K Warrants  200  $1 
Series 2020-A Warrants  1,866,558   1,120 

 

  1,866,758  $1,121