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Note 8 - Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    September 30,
2017		   December 31,
2016
Raw materials   $
7,867
     $
5,884
  
Work-in-process    
6,564
      
5,559
  
Finished goods    
5,821
      
4,540
  
Total   $
20,252
     $
15,983