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Consolidated Statements Of Stockholders' Equity (USD $)
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Total
Balance at Dec. 31, 2009$ 1$ 92,528,818$ 4,730,258$ 97,259,077
Balance, shares at Dec. 31, 20092,285,289   
Net income 4,004,076 4,004,076
Dividends ($.21 per share) (479,861) (479,861)
Shares of common stock repurchased and retired (330,683) (330,683)
Shares of common stock repurchased and retired, shares(10,592)   
Stock options exercised 139,000 139,000
Stock options exercised, shares9,345   
Share-based compensation expense 163,739 163,739
Amortization related to postretirement health benefits  11,36511,365
Net unrealized gain on investments  1,696,2891,696,289
Balance at Sep. 30, 2010196,025,0896,437,912102,463,002
Balance, shares at Sep. 30, 20102,284,042   
Balance at Dec. 31, 2010198,240,1095,688,705103,928,815
Balance, shares at Dec. 31, 20102,282,596   
Net income 5,054,477 5,054,477
Dividends ($.21 per share) (450,822) (450,822)
Shares of common stock repurchased and retired (5,426,478) (5,426,478)
Shares of common stock repurchased and retired, shares(168,516)   
Stock options exercised 152,526 152,526
Stock options exercised, shares7,550   
Share-based compensation expense 159,783 159,783
Amortization related to postretirement health benefits  6,2966,296
Net unrealized gain on investments  423,901423,901
Balance at Sep. 30, 2011$ 1$ 97,729,595$ 6,118,902$ 103,848,498
Balance, shares at Sep. 30, 20112,131,630