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Financial Instruments (Marketable Debt Securities) (Details) - USD ($) | Dec. 31, 2016 | Dec. 26, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 61,667,245 | $ 61,120,471
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (291,844) | (177,580)
Available-for-sale Securities, Debt Securities | 61,375,401 | 60,942,891
Less than One year | 37,035,174 |
One to Five years | 19,412,777 |
Greater than Five years | 4,927,450 |
Fair Value | 61,375,401 |
U.S. government and agency backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 36,343,817 | 46,586,224
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (252,556) | (121,561)
Available-for-sale Securities, Debt Securities | 36,091,261 |
Less than One year | 14,473,073 |
One to Five years | 16,690,738 |
Greater than Five years | 4,927,450 |
Fair Value | 36,091,261 | 46,464,663
Corporate Debt Securities And Certificates Of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 25,323,428 | 14,534,247
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (39,288) | (56,019)
Available-for-sale Securities, Debt Securities | 25,284,140 | $ 14,478,228
Less than One year | 22,562,101 |
One to Five years | 2,722,039 |
Greater than Five years | 0 |
Fair Value | $ 25,284,140 |

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- Definition This item represents the fair value of debt securities which are expected to mature after five years from the balance sheet date which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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