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Note 16 - Warrants (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Number of
Warrant Shares

  

Weighted
Average
Exercise
Price

  

Weighted
Average
Remaining
Contractual
Life (in years)

  

Weighted
Average
Fair Value

 

Outstanding at December 31, 2018

  333,034  $13.39   3.7  $3.38 

Exercised

  (15,385)  13.00   0    

Reserved for future issuance

  1,753,523   1.39   2.2   1.22 

Outstanding at December 31, 2019

  2,071,172  $2.05   2.4  $1.34 

Granted

  50,735,292   0.68   2.4   0.19 

Exercised

  (4,911,764)  0.68   0    

Exchanged

  (2,040,757)  1.24   0    

Reserved for future issuance

  644,966   0.35   1.3   0.45 

Outstanding at December 31, 2020

  46,498,909  $0.71   2.4  $0.20