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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, 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 | 6,343,420 |  | 6,343,420 |  |
Dividends | (616,677) |  | (616,677) |  |
Shares of common stock repurchased and retired (in shares) |  | (34,870) |  |  |
Shares of common stock repurchased and retired | (3,134,126) |  | (3,134,126) |  |
Stock options and stock appreciation rights exercised (in shares) |  | 1,289 |  |  |
Stock options and stock appreciation rights exercised | (200) |  | (200) |  |
Share-based compensation expense | 67,401 |  | 67,401 |  |
Amortization related to postretirement health benefits | 2,950 |  |  | 2,950 |
Net unrealized gain on investments | 2,733,579 |  |  | 2,733,579 |
Net loss attributable to noncontrolling interests | (8,912) |  |  |  | (8,912)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | (8,647) |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Repurchase of Shares by Subsidiary | (496) |  |  |  |
Income tax benefit from share-based compensation | 32,292 |  | 32,292 |  |
Balance, end of year at Jun. 30, 2016 | 148,187,664 | $ 1 | 133,878,480 | 14,219,544 | 89,639
Balance, end of year, shares at Jun. 30, 2016 |  | 1,916,216 |  |  |
Balance, beginning of year at Dec. 31, 2016 | 155,135,954 | $ 1 | 143,283,621 | 11,761,447 | 90,885
Balance, beginning of year, shares at Dec. 31, 2016 |  | 1,884,283 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income attributable to the Company | 10,151,247 |  | 10,151,247 |  |
Dividends | (1,037,619) |  | (1,037,619) |  |
Shares of common stock repurchased and retired (in shares) |  | (70) |  |  |
Shares of common stock repurchased and retired | (8,986) |  | (8,986) |  |
Stock options and stock appreciation rights exercised (in shares) |  | 3,043 |  |  |
Stock options and stock appreciation rights exercised | (737) |  | (737) |  |
Share-based compensation expense | 94,667 |  | 94,667 |  |
Amortization related to postretirement health benefits | 2,844 |  |  | 2,844 |
Net unrealized gain on investments | 1,903,984 |  |  | 1,903,984 |
Net loss attributable to noncontrolling interests | (11,044) |  |  |  | (11,044)
Balance, end of year at Jun. 30, 2017 | $ 166,230,310 | $ 1 | $ 152,482,193 | $ 13,668,275 | $ 79,841
Balance, end of year, shares at Jun. 30, 2017 |  | 1,887,256 |  |  |

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