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Financial Instruments (Marketable Debt Securities) (Details) - USD ($)
Dec. 26, 2015
Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 61,120,471 $ 76,462,737
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 177,580 239,602
Available-for-sale Securities, Debt Securities 60,942,891 76,223,135
Less than One year 29,546,887  
One to Five years 26,298,773  
Greater than Five years 5,097,231  
Fair Value 60,942,891  
U.S. government and agency backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 46,586,224 57,897,914
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 121,561 (200,772)
Available-for-sale Securities, Debt Securities 46,464,663  
Less than One year 17,460,832  
One to Five years 23,906,600  
Greater than Five years 5,097,231  
Fair Value 46,464,663 57,697,142
Corporate Debt Securities And Certificates Of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 14,534,247 18,564,823
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 56,019 38,830
Available-for-sale Securities, Debt Securities 14,478,228 $ 18,525,993
Less than One year 12,086,055  
One to Five years 2,392,173  
Greater than Five years 0  
Fair Value $ 14,478,228