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Note 6 - Inventories (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory Current and Noncurrent [Table Text Block]
   
March 31, 201
9
    
December 31, 201
8
  
Current:
                
Raw materials
   $
499
     $
1,795
  
Finished goods
    
11,832
      
11,433
  
    $
12,331
     $
13,228
  
                 
Long-term:
                
Raw materials
   $
1,947
     $
2,165
  
Finished goods
    
6,534
      
6,788
  
    $
8,481
     $
8,953