Property, Plant and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011
Components of property, plant and equipment
Total property, plant and equipment, gross	$ 63,747,000		$ 63,747,000		$ 52,255,000
Accumulated depreciation	(20,667,000)		(20,667,000)		(16,734,000)
Total property, plant and equipment, net	43,080,000		43,080,000		35,521,000
Property, Plant and Equipment (Details Textual)
Depreciation expense	1,300,000	1,100,000	3,500,000	2,400,000
Land [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	15,570,000		15,570,000		15,570,000
Building and improvements [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	19,425,000		19,425,000		19,191,000
Machinery and equipment [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	22,560,000		22,560,000		14,693,000
Furniture and fixtures [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	2,458,000		2,458,000		2,285,000
Capital in progress [Member]
Components of property, plant and equipment
Total property, plant and equipment, gross	$ 3,734,000		$ 3,734,000		$ 516,000