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Schedule of Available-for-sale Marketable Debt Securities (Details) - USD ($) | Dec. 26, 2020 | Dec. 28, 2019
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Amortized Cost | $ 3,607,645 | $ 15,763,527
Unrealized Gains/(Losses) | 28,036 | (10,530)
Fair Value | 3,635,681 | 15,752,997
U.S. Government and Agency Backed Securities [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Amortized Cost | 1,003,941 | 8,304,229
Unrealized Gains/(Losses) | 19,179 | (7,359)
Fair Value | 1,023,120 | 8,296,870
Corporate Debt [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Amortized Cost | 2,603,704 | 7,459,298
Unrealized Gains/(Losses) | 8,857 | (3,171)
Fair Value | $ 2,612,561 | $ 7,456,127

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