CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 21,799,700	$ 20,066,500	$ 18,231,600
Unrealized net gains (losses) on marketable securities:
Unrealized holding net gains (losses) arising during period	9,300	(47,600)	(100)
Reclassification adjustment for net gains included in net income	(2,300)	(5,600)
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX	7,000	(53,200)	(100)
Unrealized net gains/losses on marketable securities:
Unrealized holding net gains/losses arising during period	(3,700)	18,000
Reclassification adjustment for net gains included in net income	900	2,200
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME	(2,800)	20,200
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	4,200	(33,000)	(100)
COMPREHENSIVE INCOME	$ 21,803,900	$ 20,033,500	$ 18,231,500