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Inventories (Tables)
 3 Months Ended
Mar. 30, 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):
 
 
 
March 30,
2018
 
December 29,
2017
 
Raw materials and purchased parts
 
$
2,485
 
$
2,506
 
Work in process
 
 
2,451
 
 
1,996
 
Finished goods
 
 
10,566
 
 
11,533
 
 
 
 
15,502
 
 
16,035
 
Less inventory reserves
 
 
2,058
 
 
2,361
 
Total
 
$
13,444
 
$
13,674