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Note 6 - Inventories
12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6. Inventories
 
Inventories consist of the following (in thousands):
 
    December 31,
    2015   2014
Raw materials   $ 5,780     $ 6,162  
Work-in-process     5,656       3,041  
Finished goods     3,502       3,204  
Total   $ 14,938     $ 12,407