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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)
Sep. 26, 2015
Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 72,318,489 $ 76,462,737
Unrealized Gains 90,991 0
Unrealized Losses (47,506) (239,602)
Fair Value 72,361,974 76,223,135
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 41,559,697  
One to five years 23,121,239  
Greater than five years 7,681,038  
Available-for-sale Securities 72,361,974  
U.S. government and agency backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 53,416,049 57,897,914
Unrealized Gains 90,991 0
Unrealized Losses 0 (200,772)
Fair Value 53,507,040 57,697,142
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 25,108,141  
One to five years 20,717,860  
Greater than five years 7,681,038  
Available-for-sale Securities 53,507,039  
Corporate debt and certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 18,902,440 18,564,823
Unrealized Gains 0 0
Unrealized Losses (47,506) (38,830)
Fair Value 18,854,934 $ 18,525,993
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 16,451,556  
One to five years 2,403,379  
Greater than five years 0  
Available-for-sale Securities $ 18,854,935