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Note 12 - Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
 
 
 
  
Weighted-
  
   
 
 
 
  
Average
  
   
Warrants
    
Exercise
  
   
(in thousands)
    
Price
  
Outstanding at December 31, 2017
    
544
     $
1.81
  
Warrants granted
    
—
     $
—
  
Warrants exercised
    
—
     $
—
  
Warrants expired
    
—
     $
—
  
Outstanding at December 31, 2018
    
544
     $
1.81
  
Warrants granted
    
8,438
     $
1.11
  
Warrants exercised
    
(394
 )   $
0.21
  
Warrants expired
    
—
     $
—
  
Outstanding at December 31, 2019
    
8,588
     $
1.09
  
Warrants granted
    
6,899
     $
1.65
  
Warrants exercised
    
(7,791
 )   $
0.97
  
Warrants expired
    
(629
 )   $
0.81
  
Outstanding at December 31, 2020    
7,067
     $
1.63