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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) (USD $)
6 Months Ended
Jun. 29, 2013
Dec. 29, 2012
Jun. 30, 2012
Debt securities
Jun. 29, 2013
U.S. government and agency backed securities
Dec. 29, 2012
U.S. government and agency backed securities
Jun. 29, 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 98,311,615 65,106,002   74,515,552 38,074,136 23,796,063 27,031,866
Unrealized Gains 0 508,820   0 508,820 0 0
Unrealized Losses (727,455) (264,860)   (533,308) 0 (194,147) (264,860)
Fair Value 97,584,160 65,349,962   73,982,244 38,582,956 23,601,916 26,767,006
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]              
Less than one year 32,801,891     13,998,600   18,803,291  
One to five years 51,783,987     47,956,612   3,827,375  
Greater than five years $ 12,998,282     $ 12,027,032   $ 971,250