CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 5,773,200	$ 5,394,300	$ 11,189,600	$ 9,957,200
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX:
Unrealized holding net gains (losses) arising during period	9,000	18,700	16,600	34,300
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX	9,000	18,700	16,600	34,300
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME:
Unrealized holding net gains/losses arising during period	(3,500)	(7,000)	(6,300)	(12,900)
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME	(3,500)	(7,000)	(6,300)	(12,900)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	5,500	11,700	10,300	21,400
COMPREHENSIVE INCOME	$ 5,778,700	$ 5,406,000	$ 11,199,900	$ 9,978,600