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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, 2014 $ 137,563,706 $ 1 $ 124,707,196 $ 12,856,509 $ 0
Balance, beginning of year, shares at Dec. 31, 2014   2,023,270      
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 gain (loss) attributable to noncontrolling interests 4,536       4,536
Income tax benefit from share-based compensation 26,875   26,875    
Balance, end of year at Sep. 30, 2015 139,323,149 $ 1 129,585,111 9,606,451 131,586
Balance, end of year, shares at Sep. 30, 2015   1,953,418      
Balance, beginning of year at Dec. 31, 2015 142,777,080 $ 1 131,186,866 11,483,015 107,198
Balance, beginning of year, shares at Dec. 31, 2015   1,949,797      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 14,470,359   14,470,359    
Dividends (993,534)   (993,534)    
Shares of common stock repurchased and retired (in shares)   (66,803)      
Shares of common stock repurchased and retired (6,219,670)   (6,219,670)    
Stock options and stock appreciation rights exercised (in shares)   1,289      
Stock options and stock appreciation rights exercised (200)   (200)    
Share-based compensation expense 99,755   99,755    
Amortization related to postretirement health benefits 4,426     4,426  
Net unrealized gain (loss) on investments 1,962,117     1,962,117  
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests (8,646)       (8,646)
Adjustments to Additional Paid in Capital, Other (496)   (496)    
Net gain (loss) attributable to noncontrolling interests (6,684)       (6,684)
Income tax benefit from share-based compensation 32,292   32,292    
Balance, end of year at Sep. 30, 2016 $ 152,116,799 $ 1 $ 138,575,372 $ 13,449,558 $ 91,868
Balance, end of year, shares at Sep. 30, 2016   1,884,283