Business Segments and Geographic Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011	Jan. 01, 2012
Statement of Operations Data
Revenues	$ 11,846	$ 12,171
Operating income	4,768	4,760
Net income	2,591	1,323
Balance Sheet Data
Current assets	22,817		21,068
Non-current assets	40,504		39,110
Current liabilities	7,189		3,645
Non-current liabilities	41,589		45,237
Shareholders' equity	$ 14,543		$ 11,296