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Financial Instruments (Contractual Maturities) (Details) - USD ($) | Dec. 29, 2018 | Dec. 30, 2017
--- | --- | ---
Available-for-sale Securities Contractual Maturities |  |
Less than One year | $ 6,450,257 |
One to Five years | 16,467,759 |
Debt Securities, Available-for-sale | 22,918,016 | $ 43,907,457
US Government Agencies Debt Securities [Member] |  |
Available-for-sale Securities Contractual Maturities |  |
Less than One year | 3,741,183 |
One to Five years | 9,069,740 |
Debt Securities, Available-for-sale | 12,810,923 | 34,725,811
Corporate Debt Securities [Member] |  |
Available-for-sale Securities Contractual Maturities |  |
Less than One year | 2,709,074 |
One to Five years | 7,398,019 |
Debt Securities, Available-for-sale | $ 10,107,093 | $ 8,980,906

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