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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) (USD $)
3 Months Ended
Mar. 29, 2014
Dec. 28, 2013
Mar. 30, 2013
Debt securities
Mar. 29, 2014
U.S. government and agency backed securities
Dec. 28, 2013
U.S. government and agency backed securities
Mar. 29, 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        
Amortized Cost 91,767,393 96,738,018   73,883,903 68,970,505 17,883,490 27,767,513
Unrealized Gains 0 0   0 0 0 0
Unrealized Losses (433,181) (765,483)   (383,800) (686,113) (49,381) (79,370)
Fair Value 91,334,212 95,972,535   73,500,103 68,284,392 17,834,109 27,688,143
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]              
Less than one year 34,035,109     19,652,512   14,382,597  
One to five years 46,066,283     43,598,521   2,467,762  
Greater than five years $ 11,232,820     $ 10,249,070   $ 983,750