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Note 4 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Inventory Current and Noncurrent [Table Text Block]
   
As of December 31,
  
   
2017
    
2016
  
Current:
                
Raw materials
   $
197
     $
2,291
  
Finished goods
    
14,218
      
9,086
  
Total   $
14,415
     $
11,377
  
Long-term:
                
Raw materials
   $
2,682
     $
599
  
Finished goods
    
6,026
      
1,065
  
Total   $
8,708
     $
1,664