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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 attributable to the Company   6,933,936   6,933,936
Dividends   (599,241)   (599,241)
Shares of common stock repurchased and retired   (5,940,463)   (5,940,463)
Shares of common stock repurchased and retired, shares (182,615)      
Stock options exercised   155,163   155,163
Stock options exercised, shares 7,700     7,700
Share-based compensation expense   213,514   213,514
Amortization related to postretirement health benefits     8,394 8,394
Accumulated postretirement benefit obligation adjustment     (75,959) (75,959)
Net unrealized gain on investments     1,888,025 1,888,025
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 attributable to the Company   11,102,496   11,102,496
Dividends   (603,334)   (603,334)
Shares of common stock repurchased and retired   (3,975,532)   (3,975,532)
Shares of common stock repurchased and retired, shares (70,702)      
Stock options exercised   160,557   160,557
Stock options exercised, shares 6,380     6,380
Share-based compensation expense   74,553   74,553
Amortization related to postretirement health benefits     6,648 6,648
Accumulated postretirement benefit obligation adjustment     (54,726) (54,726)
Net unrealized gain on investments     1,393,943 1,393,943
Other   58,701 (36,600) 22,101
Balance at Dec. 31, 2012 $ 1 $ 105,820,459 $ 8,818,430 $ 114,638,890
Balance, shares at Dec. 31, 2012 2,043,359