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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME    
Net income $ 6,960,400 $ 5,550,800
Other comprehensive income (loss), before tax:    
Unrealized holding net gains (losses) arising during period   7,600
Other comprehensive income (loss), before tax   7,600
Income tax (expense) benefit related to items of other comprehensive income:    
Unrealized holding net gains/losses arising during period   (2,800)
Income tax (expense) benefit related to items of other comprehensive income   (2,800)
Other comprehensive income (loss), net of tax   4,800
Comprehensive income $ 6,960,400 $ 5,555,600