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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2013
Dec. 29, 2012
Components of available for sale securities    
Total short term investments, Cost $ 22,134 $ 12,980
Total short term investments, Fair Market Value 21,954 12,430
Bonds [Member]
   
Components of available for sale securities    
Total short term investments, Cost 22,134 12,980
Total short term investments, Fair Market Value $ 21,954 $ 12,430