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Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Cash Flows [Abstract] |  |  |
Non cash net unrealized (gain) loss on investments, net of deferred tax (provision) benefit | $ (2,144,901) | $ (133,892) | $ 708,564
Adjustments to postretirement benefits obligation, net of deferred tax (provision) benefit | $ (23,676) | $ 192 | $ 21,612

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