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Consolidated Statements Of Stockholders' Equity (USD $)
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Total
Balance at Dec. 31, 2010 $ 1 $ 98,240,109 $ 5,688,705 $ 103,928,815
Balance, shares at Dec. 31, 2010 2,282,596      
Net income   1,019,207   1,019,207
Dividends ($0.07 per share)   (152,830)   (152,830)
Shares of common stock repurchased and retired   (3,929,009)   (3,929,009)
Shares of common stock repurchased and retired, shares (126,768)      
Stock options exercised   3,750   3,750
Stock options exercised, shares 250      
Share-based compensation expense   52,320   52,320
Amortization related to postretirement health benefits     3,784 3,784
Net unrealized gain on investments     465,847 465,847
Balance at Mar. 31, 2011 1 95,233,547 6,158,336 101,391,884
Balance, shares at Mar. 31, 2011 2,156,078      
Balance at Dec. 31, 2011 1 99,003,018 7,509,165 106,512,184
Balance, shares at Dec. 31, 2011 2,107,681      
Net income   1,432,139   1,432,139
Dividends ($0.07 per share)   (147,097)   (147,097)
Shares of common stock repurchased and retired   (509,711)   (509,711)
Shares of common stock repurchased and retired, shares (12,317)      
Stock options exercised   45,062   45,062
Stock options exercised, shares 2,200      
Share-based compensation expense   17,690   17,690
Amortization related to postretirement health benefits     1,662 1,662
Net unrealized gain on investments     1,177,658 1,177,658
Balance at Mar. 31, 2012 $ 1 $ 99,841,101 $ 8,688,485 $ 108,529,587
Balance, shares at Mar. 31, 2012 2,097,564