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Schedule II - Valuation and Qualifying Accounts (Details) (Reserve deducted from assets - allowance for doubtful accounts, USD $)
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Reserve deducted from assets - allowance for doubtful accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 513,000 $ 737,000 $ 583,000
Additions Charged to Income 139,000 182,000 156,000
Deductions from Reserve (341,000) (406,000) (2,000)
Balance at End of Year $ 311,000 $ 513,000 $ 737,000