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Consolidated Statements Of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating Activities    
Net income $ 4,466,180 $ 1,804,461
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 334,021 342,590
Amortization of investments, net 195,246 196,875
Amortization related to postretirement benefits obligation 2,153 2,235
Amortization of other intangible assets, net 233,588 0
Share-based compensation expense related to stock appreciation rights 32,348 35,053
Excess tax benefits related to exercise of stock appreciation rights 75,027 32,292
Net gain on disposals of property (15,723) (3,701)
Net realized gain on investments (103,339) (149,830)
Net (earnings) loss from other investments (143,243) 24,263
Provision for claims 719,397 15,959
(Benefit) provision for deferred income taxes (235,000) 1,689,000
Changes in assets and liabilities:    
(Increase) decrease in receivables (9,334) 1,452,570
(Increase) decrease in other assets (1,168,522) 4,032,198
Increase in current income taxes recoverable 0 (1,036,309)
Decrease in accounts payable and accrued liabilities (3,568,633) (6,275,393)
Increase (decrease) in current income taxes payable 2,172,476 (210,355)
Payments of claims, net of recoveries (579,397) (406,959)
Net cash provided by operating activities 2,407,245 1,544,949
Investing Activities    
Purchases of available-for-sale securities (561,348) (3,583,240)
Purchases of short-term investments (7,722,430) (1,974,677)
Purchases of other investments (307,948) (473,174)
Proceeds from sales and maturities of available-for-sale securities 3,693,973 4,130,767
Proceeds from sales and maturities of short-term investments 645,805 1,320,014
Proceeds from sales and distributions of other investments 1,050,225 1,741,134
Proceeds from sales of other assets 12,834 6,545
Purchases of property (1,063,894) (701,184)
Proceeds from the sale of property 21,700 8,501
Net cash (used in) provided by investing activities (4,231,083) 474,686
Financing Activities    
Repurchases of common stock (8,986) (1,626,668)
Exercises of stock options and SARs (380) (200)
Dividends paid (377,218) (309,104)
Net cash used in financing activities (386,584) (1,935,972)
Net (Decrease) Increase in Cash and Cash Equivalents (2,210,422) 83,663
Cash and Cash Equivalents, Beginning of Period 27,928,472 21,790,068
Cash and Cash Equivalents, End of Period 25,718,050 21,873,731
Cash Paid During the Year for:    
Income tax (refunds) payments, net (27,500) 1,926,400
Non cash net unrealized gain on investments, net of deferred tax provision of $(537,391) and $(369,394) for March 31, 2017 and March 31, 2016, respectively $ (1,038,250) $ (699,846)