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Valuation and Qualifying Accounts (Details) - USD ($)
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]        
Valuation Allowances and Reserves, Balance $ 149,000 $ 136,000 $ 153,000 $ 266,000
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense 13,000 0 0  
Valuation Allowances and Reserves, Deductions $ 0 $ (17,000) $ (113,000)