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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME        
NET INCOME $ 5,719,000 $ 6,094,200 $ 16,908,600 $ 16,051,400
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX:        
Unrealized holding net gains (losses) arising during period (700) 6,800 15,900 41,100
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX (700) 6,800 15,900 41,100
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME:        
Unrealized holding net gains/losses arising during period 300 (2,600) (6,000) (15,500)
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME 300 (2,600) (6,000) (15,500)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (400) 4,200 9,900 25,600
COMPREHENSIVE INCOME $ 5,718,600 $ 6,098,400 $ 16,918,500 $ 16,077,000