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Note 14 - Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Warrants
(in thousands)

  

Weighted-

Average

Exercise

Price

 

Outstanding at December 31, 2020

  7,067  $1.63 

Warrants granted

  15  $0.67 

Warrants expired

    $ 

Outstanding at December 31, 2021

  7,082  $1.63