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Note 8 - Inventories
3 Months Ended
Mar. 31, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
8.
            Inventories
 
Inventories consist of the following:
 
    March 31,   December 31,
    2017   2016
Raw materials   $
5,902
    $
5,884
 
Work-in-process    
5,615
     
5,559
 
Finished goods    
4,663
     
4,540
 
Total   $
16,180
    $
15,983