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Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Estimated future amortization expense for purchased intangible assets    
2013 $ 249  
2014 71  
2015 86  
2016 16  
2017 16  
Thereafter 116  
Total $ 554 $ 745