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Note 6 - Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory Current and Noncurrent [Table Text Block]
   
As of
  
   
September 30
, 2018
    
December 31, 2017
  
Current:
                
Raw materials
   $
1,632
     $
197
  
Finished goods
    
11,667
      
14,218
  
Total current inventories   $
13,299
     $
14,415
  
                 
Long-term:
                
Raw materials
   $
1,931
     $
2,682
  
Finished goods
    
6,335
      
6,026
  
Total long-term inventories   $
8,266
     $
8,708