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Schedule of Valuation and Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |  |  |
Begining balance | $ 938,000 | $ 304,000 | $ 149,000
Additions charged to Income | 42,000 | 951,000 | 268,000
Deductions from reserve | 805,000 | (317,000) | (113,000)
Ending balance | 175,000 | 938,000 | 304,000
Deductions from reserve | $ (805,000) | $ 317,000 | $ 113,000

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