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Consolidated Statements Of Comprehensive Income - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 25,700,570 | $ 19,515,452 | $ 12,549,053
Other comprehensive income (loss), before tax: |  |  |
Amortization related to prior year service cost | 0 | 0 | 4,390
Amortization of unrecognized loss | 8,612 | 8,941 | 3,514
Accumulated postretirement expense (benefit) obligation adjustment | 69,634 | (566) | (63,566)
Unrealized gains (losses) on investments arising during the period | 7,478,490 | 1,145,529 | (2,077,542)
Reclassification adjustment for sale of securities included in net income | (1,227,265) | (972,672) | (718,837)
Reclassification adjustment for write-down of securities included in net income | 25,411 | 233,941 | 751,059
Other comprehensive income (loss), before tax | 6,354,882 | 415,173 | (2,100,982)
Income tax expense (benefit) related to postretirement health benefits | 26,602 | 2,849 | (18,924)
Income tax expense (benefit) related to unrealized gains (losses) on investments arising during the year | 2,555,694 | 387,508 | (722,226)
Income tax benefit related to reclassification adjustment for sale of securities included in net income | (419,462) | (333,426) | (245,200)
Income tax expense related to reclassification adjustment for write-down of securities included in net income | 8,669 | 79,810 | 258,862
Net income tax expense (benefit) on other comprehensive income (loss) | 2,171,503 | 136,741 | (727,488)
Other comprehensive income (loss) | 4,183,379 | 278,432 | (1,373,494)
Comprehensive Income | 29,883,949 | 19,793,884 | 11,175,559
Less: Comprehensive loss (income) attributable to noncontrolling interests | 5,932 | 7,666 | (15,148)
Comprehensive Income Attributable to the Company | $ 29,889,881 | $ 19,801,550 | $ 11,160,411

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