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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, 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 on investments 1,962,117     1,962,117  
Net loss attributable to noncontrolling interests (6,684)       (6,684)
Purchase of noncontrolling interest of subsidiary (8,646)       (8,646)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Repurchase of Shares by Subsidiary (496)   (496)    
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      
Balance, beginning of year at Dec. 31, 2016 155,135,954 $ 1 143,283,621 11,761,447 90,885
Balance, beginning of year, shares at Dec. 31, 2016   1,884,283      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 16,077,704   16,077,704    
Dividends (1,792,430)   (1,792,430)    
Shares of common stock repurchased and retired (in shares)   (300)      
Shares of common stock repurchased and retired (49,604)   (49,604)    
Stock options and stock appreciation rights exercised (in shares)   3,043      
Stock options and stock appreciation rights exercised (737)   (737)    
Share-based compensation expense 156,987   156,987    
Amortization related to postretirement health benefits 4,265     4,265  
Net unrealized gain on investments 2,609,982     2,609,982  
Net loss attributable to noncontrolling interests (10,886)       (10,886)
Balance, end of year at Sep. 30, 2017 $ 172,131,235 $ 1 $ 157,675,541 $ 14,375,694 $ 79,999
Balance, end of year, shares at Sep. 30, 2017   1,887,026