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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) |

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