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Note 4 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory Current and Noncurrent [Table Text Block]
   
As of December 31,
  
   
2018
    
2017
  
Current:
                
Raw materials
   $
1,795
     $
197
  
Finished goods
    
11,433
      
14,218
  
Total
   $
13,228
     $
14,415
  
Long-term:
                
Raw materials
   $
2,165
     $
2,682
  
Finished goods
    
6,788
      
6,026
  
Total
   $
8,953
     $
8,708