Business Segments and Geographic Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011	Jan. 01, 2012
Statement of Operations Data
Revenues	$ 11,651	$ 12,830	$ 23,496	$ 25,001
Operating income	4,706	5,369	9,474	10,129
Net income	2,641	2,837	5,232	4,160
Balance Sheet Data
Current assets	22,774		22,774
Non-current assets	37,317		37,317		39,110
Current liabilities	3,331		3,331		3,645
Non-current liabilities	40,473		40,473		45,237
Shareholders' equity	$ 16,287		$ 16,287		$ 11,296