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Note 7 - Inventories
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Inventory Disclosure [Text Block]
7.
INVENTORIES
 
(In Thousands)
 
    December 31
    2016   2015
         
Finished goods   $
2,586
     $
3,080
  
Work-in-process    
3,341
      
1,847
  
Raw materials    
3,348
      
4,735
  
                 
    $
9,275
     $
9,662