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Financial Instruments (Contractual Maturities) (Details) - USD ($) | Dec. 28, 2019 | Dec. 29, 2018
--- | --- | ---
Available-for-sale Securities Contractual Maturities |  |
Less than One year | $ 3,645,865 |
One to Five years | 12,107,132 |
Debt Securities, Available-for-sale | 15,752,997 | $ 22,918,016
US Government Agencies Debt Securities [Member] |  |
Available-for-sale Securities Contractual Maturities |  |
Less than One year | 299,250 |
One to Five years | 7,997,620 |
Debt Securities, Available-for-sale | 8,296,870 | 12,810,923
Corporate Debt Securities [Member] |  |
Available-for-sale Securities Contractual Maturities |  |
Less than One year | 3,346,615 |
One to Five years | 4,109,512 |
Debt Securities, Available-for-sale | $ 7,456,127 | $ 10,107,093

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