CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 4,280,800	$ 4,336,900	$ 8,832,700	$ 8,394,400
Unrealized net gains/losses on marketable securities:
Unrealized holding net gains/losses arising during period	17,200	(4,800)	5,200	(1,400)
Reclassification adjustment for net gains included in net income			(3,800)
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX	17,200	(4,800)	1,400	(1,400)
Unrealized net gains/losses on marketable securities:
Unrealized holding net gains arising during period	(6,500)	1,800	(1,900)	500
Reclassification adjustment for net gains included in net income			1,400
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME	(6,500)	1,800	(500)	500
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	10,700	(3,000)	900	(900)
COMPREHENSIVE INCOME	$ 4,291,500	$ 4,333,900	$ 8,833,600	$ 8,393,500