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Inventories (Tables)
 9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories, net are stated at the lower of cost, determined on a first-in, first-out basis or market value and consisted of the following (in thousands):
 
 
 
September 30,
 
January 1,
 
 
 
2016
 
2016
 
Raw materials and purchased parts
 
$
2,177
 
$
2,317
 
Work-in-process
 
 
2,099
 
 
1,995
 
Finished goods
 
 
15,714
 
 
15,058
 
 
 
 
19,990
 
 
19,370
 
Less: inventory reserves
 
 
4,095
 
 
3,449
 
 
 
$
15,895
 
$
15,921