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Note 8 - Inventories
 6 Months Ended
Jun. 30, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
8.
       Inventories
 
Inventories consist of the following:
 
    June 30,
2017		   December 31,
2016
Raw materials   $
6,287
     $
5,884
  
Work-in-process    
6,466
      
5,559
  
Finished goods    
4,831
      
4,540
  
Total   $
17,584
     $
15,983