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Consolidated Statements Of Stockholders' Equity - USD ($)
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income
Noncontrolling Interest [Member]
Balance, beginning of year at Dec. 31, 2013 $ 128,062,154 $ 1 $ 116,714,749 $ 11,347,404 $ 0
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 (loss) 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 0
Balance, end of year, shares at Sep. 30, 2014   2,028,818      
Balance, beginning of year at Dec. 31, 2013 128,062,154 $ 1 116,714,749 11,347,404 0
Balance, beginning of year, shares at Dec. 31, 2013   2,037,135      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Temporary equity, interest resulting from subsidiary purchase (114,320)        
Balance, end of year at Dec. 31, 2014 137,563,706 $ 1 124,707,196 12,856,509 0
Balance, end of year, shares at Dec. 31, 2014   2,023,270      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 137,563,706        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 10,337,583   10,337,583    
Dividends (477,392)   (477,392)    
Shares of common stock repurchased and retired (in shares)   (72,044)      
Shares of common stock repurchased and retired (5,166,846)   (5,166,846)    
Stock options and stock appreciation rights exercised (in shares)   2,192      
Stock options and stock appreciation rights exercised 54,988   54,988    
Share-based compensation expense 102,707   102,707    
Amortization related to postretirement health benefits 3,912     3,912  
Net unrealized gain (loss) on investments (3,253,970)     (3,253,970)  
Noncontrolling Interest, Increase from Business Combination 127,050       127,050
Net Income (Loss) Attributable to Noncontrolling Interest 4,536       4,536
Temporary equity, interest resulting from subsidiary purchase 0        
Income tax benefit from share-based compensation 26,875   26,875    
Balance, end of year at Sep. 30, 2015 139,191,563        
Balance, end of year, shares at Sep. 30, 2015   1,953,418      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 139,323,149 $ 1 $ 129,585,111 $ 9,606,451 $ 131,586