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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, 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    
Balance, beginning of year at Dec. 31, 2013 128,062,154 1 116,714,749 11,347,404
Balance, beginning of year, shares at Dec. 31, 2013   2,037,135    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income attributable to the Company 6,954,526   6,954,526  
Dividends (488,127)   (488,127)  
Shares of common stock repurchased and retired (in shares)   (9,824)    
Shares of common stock repurchased and retired (652,657)   (652,657)  
Stock options and stock appreciation rights exercised (in shares)   1,507    
Stock options and stock appreciation rights exercised 27,100   27,100  
Share-based compensation expense 88,291   88,291  
Amortization related to postretirement health benefits 1,098     1,098
Net unrealized gain on investments 772,074     772,074
Temporary Equity, Interest Resulting From Subsidiary Purchase (114,320)   (114,320)  
Income tax benefit from share-based compensation 15,999   15,999  
Balance, end of year at Sep. 30, 2014 $ 134,666,138 $ 1 $ 122,545,561 $ 12,120,576
Balance, end of year, shares at Sep. 30, 2014   2,028,818