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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 25, 2011
Jun. 30, 2012
Jun. 25, 2011
NET INCOME $ 3,404,400 $ 3,400,200 $ 6,920,400 $ 6,426,500
Unrealized net gains (losses) on marketable securities:        
Unrealized holding net gains (losses) losses arising during period 3,600   3,600 (1,000)
Reclassification adjustment for net gains included in net income     (28,000)  
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX 3,600   (24,400) (1,000)
Unrealized net gains (losses) on marketable securities:        
Unrealized holding net gains (losses) losses arising during period (1,400)   (1,400) 400
Reclassification adjustment for net gains included in net income     11,000  
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME (1,400)   9,600 400
OTHER COMPREHENSIVE GAIN (LOSS), NET OF TAX 2,200   (14,800) (600)
COMPREHENSIVE INCOME $ 3,406,600 $ 3,400,200 $ 6,905,600 $ 6,425,900