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Consolidated Statements of Shareholders' Equity and Comprehensive Income (USD $)
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Comprehensive Income
BALANCE at Dec. 26, 2009 $ 15,328,700   $ 15,319,100 $ 9,600  
BALANCE (in shares) at Dec. 26, 2009   5,125,025      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Repurchase of common stock (3,997,600) (1,150,000) (2,847,600)    
Repurchase of common stock (in shares)   (165,590)      
Stock options exercised and related tax benefits 938,200 938,200      
Stock options exercised and related tax benefits (in shares)   61,304      
Compensation expense relating to stock options 725,500 725,500      
Cash dividends (301,200)   (301,200)    
Unrealized gain (loss) on marketable securities net of reclassification adjustments, net of related tax benefits of $11,000 and $5,900 for the fiscal years ended December 31, 2011 and December 25, 2010 respectively (9,600)     (9,600) (9,600)
Net income 10,329,000   10,329,000   10,329,000
Total comprehensive income 10,319,400       10,319,400
BALANCE at Dec. 25, 2010 23,013,000 513,700 22,499,300    
BALANCE (in shares) at Dec. 25, 2010 5,020,739 5,020,739      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Repurchase of common stock (3,527,200) (1,942,400) (1,584,800)    
Repurchase of common stock (in shares)   (99,494)      
Stock options exercised and related tax benefits 1,302,800 1,302,800      
Stock options exercised and related tax benefits (in shares)   66,398      
Compensation expense relating to stock options 755,700 755,700      
Cash dividends (547,600)   (547,600)    
Unrealized gain (loss) on marketable securities net of reclassification adjustments, net of related tax benefits of $11,000 and $5,900 for the fiscal years ended December 31, 2011 and December 25, 2010 respectively 17,000     17,000 17,000
Net income 14,095,000   14,095,000   14,095,000
Total comprehensive income 14,112,000       14,112,000
BALANCE at Dec. 31, 2011 $ 35,108,700 $ 629,800 $ 34,461,900 $ 17,000  
BALANCE (in shares) at Dec. 31, 2011 4,987,643 4,987,643