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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
NET INCOME $ 18,231,600 $ 12,937,900 $ 14,095,000
Unrealized net gains (losses) on marketable securities:      
Unrealized holding net gains (losses) arising during period (100) (6,500) 28,000
Reclassification adjustment for net gains included in net income   (28,000)  
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX (100) (34,500) 28,000
Unrealized net gains/losses on marketable securities:      
Unrealized holding net gains/losses arising during period   2,500 (11,000)
Reclassification adjustment for net gains included in net income   11,000  
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME   13,500 (11,000)
OTHER COMPREHENSIVE GAIN (LOSS), NET OF TAX (100) (21,000) 17,000
COMPREHENSIVE INCOME $ 18,231,500 $ 12,916,900 $ 14,112,000