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Earnings Per Common Share And Share Awards (Tables)
9 Months Ended
Sep. 30, 2012
Earnings Per Common Share And Share Awards [Abstract]  
Computation Of Basic And Diluted Earnings Per Share
    Three months ended   Nine months ended
    September 30,   September 30,
    2012     2011   2012     2011
 
Net income attributable to the Company $ 3,158,185 $ 2,440,465 $ 7,939,812 $ 5,054,477
Weighted average common shares                    
outstanding – Basic   2,071,605     2,124,078   2,090,369     2,164,240
Incremental shares outstanding assuming                    
the exercise of dilutive stock options                    
and SARs (share settled)   36,921     19,249   33,753     16,215
Weighted average common shares                    
outstanding - Diluted   2,108,526     2,143,327   2,124,122     2,180,455
 
Basic earnings per common share $ 1.52   $ 1.15 $ 3.80   $ 2.34
 
Diluted earnings per common share $ 1.50   $ 1.14 $ 3.74   $ 2.32
Summary Of Share-Based Award Transactions
        Weighted Average    
        Average Remaining   Aggregate
  Number     Exercise Contractual   Intrinsic
  Of Shares     Price Term (years)   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 September 30, 2012 98,400   $ 30.74 3.42 $ 3,394,561
 
Exercisable as of September 30, 2012 96,600   $ 30.43 3.38 $ 3,362,208
 
Unvested as of September 30, 2012 1,800   $ 47.27 5.82 $ 32,353
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 %