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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 5,846,621   5,846,621    
Dividends (321,117)   (321,117)    
Shares of common stock repurchased and retired (in shares)   (24,432)      
Shares of common stock repurchased and retired (1,747,322)   (1,747,322)    
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 67,654   67,654    
Amortization related to postretirement health benefits 2,608     2,608  
Net unrealized gain (loss) on investments (1,835,320)     (1,835,320)  
Net loss attributable to noncontrolling interests 0        
Income tax benefit from share-based compensation 26,875   26,875    
Balance, end of year at Jun. 30, 2015 139,658,693 $ 1 128,634,895 11,023,797 0
Balance, end of year, shares at Jun. 30, 2015   2,001,030      
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 (loss) on investments 2,733,579     2,733,579  
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests (8,647)       (8,647)
Adjustments to Additional Paid in Capital, Other (496)   (496)    
Net loss attributable to noncontrolling interests (8,912)       (8,912)
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