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Consolidated Statements Of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Operating Activities:    
Net income $ 2,614,012 $ 2,554,975
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 255,290 272,125
Amortization, net 165,255 167,243
Amortization related to postretirement benefits obligation 11,480 11,478
Share-based compensation expense related to stock options 106,053 110,188
Decrease in allowance for doubtful accounts on premiums receivable (119,000) (247,000)
Net gain on disposals of property   (480)
Net realized gain on investments and other assets (120,915) (350,930)
Net earnings from other investments (159,071) (183,889)
Provision for claims 1,951,587 1,424,819
Provision for deferred income taxes 909,000 1,343,000
Changes in assets and liabilities:    
Decrease (increase) in receivables 1,881,960 (441)
Increase in other assets (2,096,473) (307,559)
Increase in current income taxes receivable (730,356) (949,449)
Increase (decrease) in accounts payable and accrued liabilities 2,113,184 (513,397)
Decrease in current income taxes payable (1,056,356) (670,290)
Payments of claims, net of recoveries (2,545,287) (3,162,819)
Net cash provided by (used in) operating activities 3,180,363 (502,426)
Investing Activities:    
Purchases of available-for-sale securities (3,553,734) (9,874,722)
Purchases of short-term securities (2,776,535) (9,724,271)
Purchases of other investments (225,315) (51,143)
Proceeds from sales and maturities of available-for-sale securities 5,412,268 9,868,039
Proceeds from maturities of held-to-maturity securities   2,000
Proceeds from sales and maturities of short-term securities 7,767,645 7,019,021
Proceeds from sales and distributions of other investments 249,324 269,239
Purchases of property (157,566) (75,936)
Proceeds from the sale of property   1,200
Net cash provided by (used in) investing activities 6,716,087 (2,566,573)
Financing Activities:    
Repurchases of common stock (5,210,866) (145,622)
Exercise of options 152,526 49,022
Dividends paid (302,221) (319,944)
Net cash used in financing activities (5,360,561) (416,544)
Net Increase (Decrease) in Cash and Cash Equivalents 4,535,889 (3,485,543)
Cash and Cash Equivalents, Beginning of Period 8,117,031 8,733,221
Cash and Cash Equivalents, End of Period 12,652,920 5,247,678
Supplemental Disclosures:    
Income taxes, payments, net 1,649,000 741,000
Non cash net unrealized (gain) loss on investments, net of deferred tax (provision) benefit of ($557,803) and $75,554 for 2011 and 2010, respectively $ (1,082,268) $ 163,629