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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME      
NET INCOME $ 24,565,100 $ 22,217,600 $ 21,799,700
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX:      
Unrealized holding net gains (losses) arising during period 15,900 36,900 9,300
Reclassification adjustment for net gains included in net income     (2,300)
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX 15,900 36,900 7,000
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME:      
Unrealized holding net gains/losses arising during period (6,000) (13,900) (3,700)
Reclassification adjustment for net gains included in net income     900
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME (6,000) (13,900) (2,800)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 9,900 23,000 4,200
COMPREHENSIVE INCOME $ 24,575,000 $ 22,240,600 $ 21,803,900