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Valuation and Qualifying Accounts (Details) - USD ($)
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]        
Allowance for Doubtful Accounts Receivable $ 304,000 $ 149,000 $ 136,000 $ 153,000
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) 268,000 13,000 0  
Allowance for Doubtful Accounts Receivable, Recoveries $ (113,000) $ 0 $ (17,000)