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Schedule of Contractual Maturity (Details) - USD ($) | Dec. 26, 2020 | Dec. 28, 2019
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Less than One year | $ 1,102,171 |
One to Five years | 2,533,510 |
Debt Securities, Available-for-sale | 3,635,681 | $ 15,752,997
US Government Agencies Debt Securities [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Less than One year |  |
One to Five years | 1,023,120 |
Debt Securities, Available-for-sale | 1,023,120 |
Corporate Debt Securities [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Less than One year | 1,102,171 |
One to Five years | 1,510,390 |
Debt Securities, Available-for-sale | $ 2,612,561 |

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