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Inventories (Tables)
 9 Months Ended
Sep. 28, 2018
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 28,
2018
 
 
December 29,
2017
 
Raw materials and purchased parts
 
$
2,586
 
 
$
2,506
 
Work in process
 
 
2,755
 
 
 
1,996
 
Finished goods
 
 
12,247
 
 
 
11,533
 
 
 
 
17,588
 
 
 
16,035
 
Less inventory reserves
 
 
1,408
 
 
 
2,361
 
Total
 
$
16,180
 
 
$
13,674