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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