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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
 3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME        
NET INCOME $ 5,339,600 $ 5,623,000 $ 16,145,300 $ 14,455,700
Unrealized net gains (losses) on marketable securities:        
Unrealized holding net gains (losses) arising during period (30,700) (61,400) 8,000 (56,200)
Reclassification adjustment for net gains included in net income     (2,300) (3,800)
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX (30,700) (61,400) 5,700 (60,000)
Unrealized net gains/losses on marketable securities:        
Unrealized holding net gains/losses arising during period 11,600 23,300 (3,200) 21,400
Reclassification adjustment for net gains included in net income     900 1,400
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME 11,600 23,300 (2,300) 22,800
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (19,100) (38,100) 3,400 (37,200)
COMPREHENSIVE INCOME $ 5,320,500 $ 5,584,900 $ 16,148,700 $ 14,418,500