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Financial Instruments (Marketable Debt Securities) (Details) - USD ($) | Dec. 29, 2018 | Dec. 30, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 23,239,502 | $ 44,204,201
Unrealized Losses | (321,486) | (296,744)
Fair Value | 22,918,016 | 43,907,457
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 13,064,418 | 35,014,593
Unrealized Losses | (253,495) | (288,782)
Fair Value | 12,810,923 | 34,725,811
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,175,084 | 8,988,608
Unrealized Losses | (67,991) | (7,702)
Fair Value | 10,107,093 | 8,980,906
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 0 | 201,000
Unrealized Losses | 0 | (260)
Fair Value | $ 0 | $ 200,740

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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