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Inventories
 12 Months Ended
Dec. 31, 2017
Inventories [Abstract]  
Inventories
3. Inventories, net
 
The components of inventories are:
 
 
 
December 31,
 
(In thousands)
 
2017
  
2016
 
Raw materials and purchased component parts
 
$
6,322
  
$
6,298
 
Work-in-process
  
-
   
8
 
Finished goods
  
2,553
   
3,401
 
 
 
$
8,875
  
$
9,707