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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 3 Months Ended 9 Months Ended
Sep. 29, 2012
Sep. 24, 2011
Sep. 29, 2012
Sep. 24, 2011
NET INCOME $ 4,259,500 $ 3,483,500 $ 11,179,900 $ 9,910,000
Unrealized net gains (losses) on marketable securities:        
Unrealized holding net gains (losses) arising during period (5,600) (118,600) (2,000) (119,600)
Reclassification adjustment for net gains included in net income     (28,000)  
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX (5,600) (118,600) (30,000) (119,600)
Unrealized net gains/losses on marketable securities:        
Unrealized holding net gains/losses arising during period 2,200 46,600 800 47,000
Reclassification adjustment for net gains included in net income     11,000  
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME 2,200 46,600 11,800 47,000
OTHER COMPREHENSIVE GAIN (LOSS), NET OF TAX (3,400) (72,000) (18,200) (72,600)
COMPREHENSIVE INCOME $ 4,256,100 $ 3,411,500 $ 11,161,700 $ 9,837,400