Property, Equipment and Leasehold Improvements (Details) (USD $) In Thousands, unless otherwise specified	Jan. 03, 2014	Dec. 28, 2012
Property:
Land	$ 4,450	$ 4,450
Buildings	34,928	34,491
Construction in progress	51	706
Equipment:
Machinery and equipment	32,046	29,687
Office furniture and equipment	7,542	7,067
Leasehold improvements	12,745	9,724
Property, Plant and Equipment, Gross, Total	91,762	86,125
Less accumulated depreciation and amortization	63,041	58,679
Property, equipment and leasehold improvements, net	$ 28,721	$ 27,446