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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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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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