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Note 6 - Inventories (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory Current and Noncurrent [Table Text Block]
   
As of
  
   
March 31, 2018
    
December 31, 201
7
  
Current:
                
Raw materials
   $
2,204
     $
197
  
Finished goods
    
12,418
      
14,218
  
    $
14,622
     $
14,415
  
                 
Long-term:
                
Raw materials
   $
2,453
     $
2,682
  
Finished goods
    
6,112
      
6,026
  
    $
8,565
     $
8,708