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Note 6 - Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory Current and Noncurrent [Table Text Block]
   
As of
  
   
June 30
, 2018
    
December 31, 2017
  
Current:
                
Raw materials
   $
2,580
     $
197
  
Finished goods
    
11,799
      
14,218
  
    $
14,380
     $
14,415
  
                 
Long-term:
                
Raw materials
   $
2,022
     $
2,682
  
Finished goods
    
6,329
      
6,026
  
    $
8,351
     $
8,708