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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)
Jun. 27, 2015
Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 71,918,152 $ 76,462,737
Unrealized Gains 0 0
Unrealized Losses (75,091) (239,602)
Fair Value 71,843,061 76,223,135
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 38,443,933  
One to five years 25,829,291  
Greater than five years 7,569,837  
Available-for-sale Securities 71,843,061  
U.S. government and agency backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 55,505,053 57,897,914
Unrealized Gains 0 0
Unrealized Losses (39,473) (200,772)
Fair Value 55,465,580 57,697,142
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 24,030,172  
One to five years 23,865,571  
Greater than five years 7,569,837  
Available-for-sale Securities 55,465,580  
Corporate debt and certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 16,413,099 18,564,823
Unrealized Gains 0 0
Unrealized Losses (35,618) (38,830)
Fair Value 16,377,481 $ 18,525,993
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 14,413,761  
One to five years 1,963,720  
Greater than five years 0  
Available-for-sale Securities $ 16,377,481