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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 1,726,124   1,726,124    
Dividends (160,957)   (160,957)    
Shares of common stock repurchased and retired (in shares)   (15,036)      
Shares of common stock repurchased and retired (1,069,185)   (1,069,185)    
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 32,600   32,600    
Amortization related to postretirement health benefits 1,304     1,304  
Net unrealized gain on investments 178,433     178,433  
Net loss attributable to noncontrolling interests 0        
Income tax benefit from share-based compensation 26,875   26,875    
Balance, end of year at Mar. 31, 2015 138,353,888 $ 1 125,317,641 13,036,246 0
Balance, end of year, shares at Mar. 31, 2015   2,010,426      
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 1,814,040   1,814,040    
Dividends (309,104)   (309,104)    
Shares of common stock repurchased and retired (in shares)   (18,795)      
Shares of common stock repurchased and retired (1,626,668)   (1,626,668)    
Stock options and stock appreciation rights exercised (in shares)   1,289      
Stock options and stock appreciation rights exercised (200)   (200)    
Share-based compensation expense 35,053   35,053    
Amortization related to postretirement health benefits 1,475     1,475  
Net unrealized gain on investments 699,846     699,846  
Net loss attributable to noncontrolling interests (9,579)       (9,579)
Income tax benefit from share-based compensation 32,292   32,292    
Balance, end of year at Mar. 31, 2016 $ 143,414,235 $ 1 $ 131,132,279 $ 12,184,336 $ 97,619
Balance, end of year, shares at Mar. 31, 2016   1,932,291