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Consolidated Statements Of Stockholders' Equity - USD ($) | Total | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2014 | $ 137,563,706 | $ 1 | $ 124,707,196 | $ 12,856,509 | $ 0
Balance, beginning of year, shares at Dec. 31, 2014 |  | 2,023,270 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income attributable to the Company | 1,726,124 |  | 1,726,124 |  |
Dividends | (160,957) |  | (160,957) |  |
Shares of common stock repurchased and retired (in shares) |  | (15,036) |  |  |
Shares of common stock repurchased and retired | (1,069,185) |  | (1,069,185) |  |
Stock options and stock appreciation rights exercised (in shares) |  | 2,192 |  |  |
Stock options and stock appreciation rights exercised | 54,988 |  | 54,988 |  |
Share-based compensation expense | 32,600 |  | 32,600 |  |
Amortization related to postretirement health benefits | 1,304 |  |  | 1,304 |
Net unrealized gain on investments | 178,433 |  |  | 178,433 |
Net loss attributable to noncontrolling interests | 0 |  |  |  |
Income tax benefit from share-based compensation | 26,875 |  | 26,875 |  |
Balance, end of year at Mar. 31, 2015 | 138,353,888 | $ 1 | 125,317,641 | 13,036,246 | 0
Balance, end of year, shares at Mar. 31, 2015 |  | 2,010,426 |  |  |
Balance, beginning of year at Dec. 31, 2015 | 142,777,080 | $ 1 | 131,186,866 | 11,483,015 | 107,198
Balance, beginning of year, shares at Dec. 31, 2015 |  | 1,949,797 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income attributable to the Company | 1,814,040 |  | 1,814,040 |  |
Dividends | (309,104) |  | (309,104) |  |
Shares of common stock repurchased and retired (in shares) |  | (18,795) |  |  |
Shares of common stock repurchased and retired | (1,626,668) |  | (1,626,668) |  |
Stock options and stock appreciation rights exercised (in shares) |  | 1,289 |  |  |
Stock options and stock appreciation rights exercised | (200) |  | (200) |  |
Share-based compensation expense | 35,053 |  | 35,053 |  |
Amortization related to postretirement health benefits | 1,475 |  |  | 1,475 |
Net unrealized gain on investments | 699,846 |  |  | 699,846 |
Net loss attributable to noncontrolling interests | (9,579) |  |  |  | (9,579)
Income tax benefit from share-based compensation | 32,292 |  | 32,292 |  |
Balance, end of year at Mar. 31, 2016 | $ 143,414,235 | $ 1 | $ 131,132,279 | $ 12,184,336 | $ 97,619
Balance, end of year, shares at Mar. 31, 2016 |  | 1,932,291 |  |  |

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