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Note 16 - Warrants (Tables)
12 Months Ended
Dec. 31, 2021
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   3.70   3.38 

Exercised

  (15,385)  13.00   -   - 

Reserve for future issuance

  1,753,523   1.39   2.20   1.22 

Outstanding at December 31, 2019

  2,071,172  $2.05   2.40  $1.34 

Granted

  50,735,292   0.68   2.40   0.19 

Exercised

  (4,911,764)  0.68   -   - 

Exchanged

  (2,040,757)  1.24   -   - 

Reserve for future issuance

  644,966   0.35   1.30   0.45 

Unvested December 31, 2020

  46,498,909  $0.71   2.40  $0.20 

Exercised

  (45,317,101)  0.68   -   - 

Expired

  (61,508)  1.35   -   - 

Outstanding at December 31, 2021

  1,120,300  $1.94   3.00  $0.55