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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
 3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME        
NET INCOME $ 4,751,400 $ 4,280,800 $ 10,805,700 $ 8,832,700
Unrealized net gains (losses) on marketable securities:        
Unrealized holding net gains (losses) arising during period (10,000) 17,200 38,700 5,200
Reclassification adjustment for net gains included in net income     (2,300) (3,800)
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX (10,000) 17,200 36,400 1,400
Unrealized net gains/losses on marketable securities:        
Unrealized holding net gains/losses arising during period 3,700 (6,500) (14,800) (1,900)
Reclassification adjustment for net gains included in net income     900 1,400
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME 3,700 (6,500) (13,900) (500)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (6,300) 10,700 22,500 900
COMPREHENSIVE INCOME $ 4,745,100 $ 4,291,500 $ 10,828,200 $ 8,833,600