CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 4,336,900	$ 3,404,400	$ 8,394,400	$ 6,920,400
Unrealized net gains (losses) on marketable securities:
Unrealized holding net gains (losses) arising during period	(4,800)	3,600	(1,400)	3,600
Reclassification adjustment for net gains included in net income				(28,000)
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX	(4,800)	3,600	(1,400)	(24,400)
Unrealized net gains/losses on marketable securities:
Unrealized holding net gains (losses) arising during period	1,800	(1,400)	500	(1,400)
Reclassification adjustment for net gains included in net income				11,000
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME	1,800	(1,400)	500	9,600
OTHER COMPREHENSIVE GAIN (LOSS), NET OF TAX	(3,000)	2,200	(900)	(14,800)
COMPREHENSIVE INCOME	$ 4,333,900	$ 3,406,600	$ 8,393,500	$ 6,905,600