Property, Plant and Equipment (Details) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Dec. 28, 2013
Components of property, plant and equipment
Total property, plant and equipment, gross	$ 73,308,000		$ 72,784,000
Accumulated depreciation	(26,177,000)		(25,345,000)
Total property, plant and equipment, net	47,131,000		47,439,000
Property, Plant and Equipment (Details Textual)
Depreciation expense	1,600,000	1,300,000
Land [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	15,572,000		15,569,000
Building and improvements [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	19,402,000		19,403,000
Machinery and equipment [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	26,708,000		27,820,000
Furniture and fixtures [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	2,298,000		2,308,000
Software [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	7,777,000		1,851,000
Capital in progress [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	$ 1,551,000		$ 5,833,000