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Note 12 - Stockholders' Equity (Deficit) (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
 
    
Weighted-
  
   
Warrants
 
  
Average
 
   
(in thousands)
 
  
Exercise
 
   
 
 
 
  
Price
  
Outstanding at December 31, 2019
    
8,588
     $
1.09
  
Warrants granted
    
-
     $
-
  
Warrants exercised
    
(299
 )   $
0.71
  
Warrants expired
    
(42
 )   $
0.21
  
Outstanding at March 31, 2020
    
8,247
     $
1.11