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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 6,343,420   6,343,420    
Dividends (616,677)   (616,677)    
Shares of common stock repurchased and retired (in shares)   (34,870)      
Shares of common stock repurchased and retired (3,134,126)   (3,134,126)    
Stock options and stock appreciation rights exercised (in shares)   1,289      
Stock options and stock appreciation rights exercised (200)   (200)    
Share-based compensation expense 67,401   67,401    
Amortization related to postretirement health benefits 2,950     2,950  
Net unrealized gain on investments 2,733,579     2,733,579  
Net loss attributable to noncontrolling interests (8,912)       (8,912)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests (8,647)        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Repurchase of Shares by Subsidiary (496)        
Income tax benefit from share-based compensation 32,292   32,292    
Balance, end of year at Jun. 30, 2016 148,187,664 $ 1 133,878,480 14,219,544 89,639
Balance, end of year, shares at Jun. 30, 2016   1,916,216      
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 10,151,247   10,151,247    
Dividends (1,037,619)   (1,037,619)    
Shares of common stock repurchased and retired (in shares)   (70)      
Shares of common stock repurchased and retired (8,986)   (8,986)    
Stock options and stock appreciation rights exercised (in shares)   3,043      
Stock options and stock appreciation rights exercised (737)   (737)    
Share-based compensation expense 94,667   94,667    
Amortization related to postretirement health benefits 2,844     2,844  
Net unrealized gain on investments 1,903,984     1,903,984  
Net loss attributable to noncontrolling interests (11,044)       (11,044)
Balance, end of year at Jun. 30, 2017 $ 166,230,310 $ 1 $ 152,482,193 $ 13,668,275 $ 79,841
Balance, end of year, shares at Jun. 30, 2017   1,887,256