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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME    
NET INCOME $ 4,057,500 $ 3,516,000
Unrealized net gains (losses) on marketable securities:    
Unrealized holding net gains arising during period 3,400  
Reclassification adjustment for net gains included in net income   (28,000)
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX 3,400 (28,000)
Unrealized net gains/losses on marketable securities:    
Unrealized holding net gains arising during period (1,300)  
Reclassification adjustment for net gains included in net income   11,000
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME (1,300) 11,000
OTHER COMPREHENSIVE GAIN (LOSS), NET OF TAX 2,100 (17,000)
COMPREHENSIVE INCOME $ 4,059,600 $ 3,499,000