Property, Plant and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Dec. 29, 2012
Components of property, plant and equipment
Total property, plant and equipment, gross	$ 70,651,000		$ 70,651,000		$ 62,932,000
Accumulated depreciation	(24,054,000)		(24,054,000)		(19,719,000)
Total property, plant and equipment, net	46,597,000		46,597,000		43,213,000
Property, Plant and Equipment (Details Textual)
Depreciation expense	1,400,000	1,300,000	4,000,000	3,500,000
Land [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	15,569,000		15,569,000		15,573,000
Building and improvements [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	19,404,000		19,404,000		19,231,000
Machinery and equipment [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	28,299,000		28,299,000		21,523,000
Furniture and fixtures [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	2,359,000		2,359,000		2,228,000
Capital in progress [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	$ 5,020,000		$ 5,020,000		$ 4,377,000