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Inventories, Net (Tables)
 12 Months Ended
Dec. 29, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories, net consisted of the following at December 29, 2017 and December 30, 2016 (in thousands):
 
 
 
2017
 
2016
 
Raw materials and purchased parts
 
$
2,506
 
$
2,264
 
Work in process
 
 
1,996
 
 
1,924
 
Finished goods
 
 
11,169
 
 
14,268
 
 
 
 
15,671
 
 
18,456
 
Less inventory reserves
 
 
2,361
 
 
3,631
 
Total
 
$
13,310
 
$
14,825