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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) (USD $)
 6 Months Ended
Jun. 28, 2014
Dec. 28, 2013
Jun. 29, 2013
Debt securities
Jun. 28, 2014
U.S. government and agency backed securities
Dec. 28, 2013
U.S. government and agency backed securities
Jun. 28, 2014
Corporate debt and certificates of deposit
Dec. 28, 2013
Corporate debt and certificates of deposit
Schedule of Available-for-sale Securities [Line Items]              
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities     $ 0        
Available-for-sale Debt Securities, Amortized Cost Basis 85,739,910 96,738,018   65,056,839 68,970,505 20,683,071 27,767,513
Unrealized Gains 0 0   0 0 0 0
Unrealized Losses (146,394) (765,483)   (116,328) (686,113) (30,066) (79,370)
Fair Value 85,593,516 95,972,535   64,940,511 68,284,392 20,653,005 27,688,143
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]              
Less than one year 31,733,972     14,650,279   17,083,693  
One to five years 43,478,301     40,890,239   2,588,062  
Greater than five years 10,381,243     9,399,993   981,250  
Available-for-sale Securities $ 85,593,516     $ 64,940,511   $ 20,653,005