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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME        
NET INCOME $ 5,623,000 $ 5,251,500 $ 14,455,700 $ 13,645,800
Unrealized net gains/losses on marketable securities:        
Unrealized holding net gains/(losses) arising during period (61,400) (8,100) (56,200) (9,500)
Reclassification adjustment for net gains included in net income     (3,800)  
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX (61,400) (8,100) (60,000) (9,500)
Unrealized net gains/losses on marketable securities:        
Unrealized holding net gains/losses arising during period 23,300 3,100 21,400 3,600
Reclassification adjustment for net gains included in net income     1,400  
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME 23,300 3,100 22,800 3,600
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (38,100) (5,000) (37,200) (5,900)
COMPREHENSIVE INCOME $ 5,584,900 $ 5,246,500 $ 14,418,500 $ 13,639,900