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Consolidated Statements Of Stockholders' Equity (USD $)
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income
Balance, beginning of year at Dec. 31, 2011 $ 106,512,184 $ 1 $ 99,003,018 $ 7,509,165
Balance, beginning of year, shares at Dec. 31, 2011   2,107,681    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income attributable to the Company 7,939,812   7,939,812  
Dividends (438,431)   (438,431)  
Shares of common stock repurchased and retired (in shares)   (51,207)    
Shares of common stock repurchased and retired (2,804,412)   (2,804,412)  
Stock options and stock appreciation rights exercised (in shares)   6,130    
Stock options and stock appreciation rights exercised 152,792   152,792  
Share-based compensation expense 55,857   55,857  
Amortization related to postretirement health benefits 4,987     4,987
Net unrealized gain on investments 2,175,915     2,175,915
Balance, end of year at Sep. 30, 2012 113,598,704 1 103,908,636 9,690,067
Balance, end of year, shares at Sep. 30, 2012   2,062,604    
Balance, beginning of year at Dec. 31, 2012 114,638,890 1 105,820,459 8,818,430
Balance, beginning of year, shares at Dec. 31, 2012   2,043,359    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income attributable to the Company 12,898,203   12,898,203  
Dividends (494,903)   (494,903)  
Shares of common stock repurchased and retired (in shares)   (26,436)    
Shares of common stock repurchased and retired (1,881,323)   (1,881,323)  
Stock options and stock appreciation rights exercised (in shares)   49,999    
Stock options and stock appreciation rights exercised 75,797   75,797  
Share-based compensation expense 62,108   62,108  
Amortization related to postretirement health benefits 2,353     2,353
Net unrealized gain on investments 998,638     998,638
Income tax benefit from share-based compensation 938,090   938,090  
Balance, end of year at Sep. 30, 2013 $ 127,237,853 $ 1 $ 117,418,431 $ 9,819,421
Balance, end of year, shares at Sep. 30, 2013   2,066,922