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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2012
Earnings Per Share Tables  
Basic and diluted earnings per share calculation data

A reconciliation of the numerator and denominator used in the basic and diluted earnings per share calculation is presented below:

      Year ended December 31
      2012     2011     2010
Basic Earnings Per Share         
 Net income numerator  $1,953,728   $3,739,876   $2,329,152 
 Weighted average shares outstanding denominator   5,339,341    5,335,524    5,312,684 
                
 Per share amount  $0.37   $0.70   $0.44 
                
Diluted Earnings Per Share               
 Net income numerator  $1,953,728   $3,739,876   $2,329,152 
                
 Weighted average shares outstanding   5,339,341    5,335,524    5,312,684 
 Effect of diluted securities   13,637    23,066    38,894 
 Diluted shares outstanding denominator   5,352,978    5,358,590    5,351,578 
                
 Per share amount  $0.36   $0.70   $0.44