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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 29, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property, plant and equipment, net consisted of the following (in thousands):
 
  
June 29,
2018
  
December 29,
 2017
 
Machinery and equipment $18,551  $16,562 
Furniture and fixtures  9,657   9,201 
Leasehold improvements  9,718   9,631 
   37,926   35,394 
Less accumulated depreciation  26,333   25,618 
Total $11,593  $9,776