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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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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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