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Note 6 - Inventories
12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6.
Inventories
 
Inventories consist of the following:
 
    December 31,
    2017   2016
Raw materials   $
11,296
    $
5,884
 
Work-in-process    
6,062
     
5,559
 
Finished goods    
4,677
     
4,540
 
Total   $
22,035
    $
15,983