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Earnings Per Common Share And Share Awards (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Common Share And Share Awards [Abstract]  
Computation Of Basic And Diluted Earnings Per Share
    Three months ended   Six months ended
    June 30,   June 30,
    2012     2011   2012     2011
 
Net income $ 3,349,488 $ 1,594,805 $ 4,781,627 $ 2,614,012
Weighted average common shares                    
outstanding – Basic   2,098,666     2,134,164   2,099,751     2,184,323
Incremental shares outstanding assuming                    
the exercise of dilutive stock options                    
and SARs (share settled)   34,066     20,952   31,413     17,075
Weighted average common shares                    
outstanding - Diluted   2,132,732     2,155,116   2,131,164     2,201,398
 
Basic earnings per common share $ 1.60   $ 0.75 $ 2.28   $ 1.20
 
Diluted earnings per common share $ 1.57   $ 0.74 $ 2.24   $ 1.19
Summary Of Share-Based Award Transactions
  Number
Of Shares
Weighted
Average
Exercise
Price
Average
Remaining
Contractual
Term (years)
Aggregate
Intrinsic
Value
Outstanding as of January 1, 2011 110,800   $ 28.77 4.51 $ 353,955
SARs granted 3,000     41.50      
Options exercised (7,700 )   20.15      
Options/SARs cancelled/forfeited/expired (4,500 )   28.61      
Outstanding as of December 31, 2011 101,600   $ 29.81 3.91 $ 697,780
SARs granted 3,000     50.50      
Options exercised (6,130 )   24.93      
Options/SARs cancelled/forfeited/expired (70 )   31.00      
Outstanding as of June 30, 2012 98,400   $ 30.74 3.67 $ 2,576,857
 
Exercisable as of June 30, 2012 95,600   $ 30.28 3.61 $ 2,548,172
 
Unvested as of June 30, 2012 2,800   $ 46.69 5.94 $ 28,685
Weighted-Average Assumptions Of Fair Values For Stock Appreciation Rights
  2012   2011  
Expected Life in Years 5.0   5.0  
Volatility 44.6 % 43.6 %
Interest Rate 0.8 % 1.9 %
Yield Rate 0.6 % 0.8 %