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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