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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) (USD $)
9 Months Ended
Sep. 28, 2013
Dec. 29, 2012
Sep. 29, 2012
Debt securities
Sep. 28, 2013
U.S. government and agency backed securities
Dec. 29, 2012
U.S. government and agency backed securities
Sep. 28, 2013
Corporate debt and certificates of deposit
Dec. 29, 2012
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        
Amortized Cost 98,091,128 65,106,002   71,496,967 38,074,136 26,594,161 27,031,866
Unrealized Gains 0 508,820   0 508,820 0 0
Unrealized Losses (633,718) (264,860)   (519,660) 0 (114,058) (264,860)
Fair Value 97,457,410 65,349,962   70,977,307 38,582,956 26,480,103 26,767,006
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]              
Less than one year 33,307,576     11,706,953   21,600,623  
One to five years 51,188,166     47,301,186   3,886,980  
Greater than five years $ 12,961,668     $ 11,969,168   $ 992,500