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Inventories (Tables)
 9 Months Ended
Sep. 29, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories, net are stated at the lower of cost and net realizable value, determined on a first-in, first-out basis and consisted of the following (in thousands):
 
 
 
September 29,
 
December 30,
 
 
 
2017
 
2016
 
Raw materials and purchased parts
 
$
2,330
 
$
2,264
 
Work-in-process
 
 
2,363
 
 
1,924
 
Finished goods
 
 
11,059
 
 
14,268
 
 
 
 
15,752
 
 
18,456
 
Less: inventory reserves
 
 
2,478
 
 
3,631
 
 
 
$
13,274
 
$
14,825