CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 4,551,900	$ 4,057,500
Unrealized net gains (losses) on marketable securities:
Unrealized holding net gains (losses) arising during period	(12,000)	3,400
Reclassification adjustment for net gains included in net income	(3,800)
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX	(15,800)	3,400
Unrealized net gains/losses on marketable securities:
Unrealized holding net gains arising during period	4,600	(1,300)
Reclassification adjustment for net gains included in net income	1,400
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME	6,000	(1,300)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(9,800)	2,100
COMPREHENSIVE INCOME	$ 4,542,100	$ 4,059,600