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Note 12 - Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
 
 
 
  
Weighted-
  
   
Warrants
    
Average
 
   
(in thousands)
    
Exercise
 
   
 
 
 
  
Price
  
Outstanding at December 31, 2016
    
565
     $
1.81
  
Warrants granted
    
-
     $
-
  
Warrants exercised
    
(21
 )   $
1.81
  
Warrants expired
    
-
     $
-
  
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