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Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Cash Flows [Abstract] |  |  |
Non cash net unrealized loss (gain) on investments, deferred tax benefit (provision) | $ (133,892) | $ 708,564 | $ (805,799)
Adjustments to postretirement benefits obligation, net of deferred tax benefit (provision) | $ 192 | $ 21,612 | $ 16,021

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