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Consolidated Statements Of Comprehensive Income - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net income $ 12,549,053 $ 9,672,498 $ 14,796,738
Other comprehensive income, before tax:      
Amortization (accretion) related to prior year service cost 4,390 2,217 (1,518)
Amortization of unrecognized loss 3,514 0 6,293
Accumulated postretirement (benefit) provision obligation adjustment (63,566) (47,121) 77,213
Unrealized (losses) gains on investments arising during the period (2,077,542) 2,848,256 3,959,623
Reclassification adjustment for sale of securities included in net income (718,837) (518,279) (229,869)
Reclassification adjustment for write-down of securities included in net income 751,059 14,542 34,070
Other comprehensive (loss) income, before tax (2,100,982) 2,299,615 3,845,812
Income tax (benefit) expense related to postretirement health benefits (18,924) (15,269) 27,887
Income tax (benefit) expense related to unrealized (losses) gains on investments arising during the year (722,226) 974,145 1,354,439
Income tax benefit related to reclassification adjustment for sale of securities included in net income (245,200) (173,403) (78,622)
Income tax expense related to reclassification adjustment for write-down of securities included in net income 258,862 5,037 13,134
Net income tax (benefit) expense on other comprehensive (loss) income (727,488) 790,510 1,316,838
Other comprehensive (loss) income (1,373,494) 1,509,105 2,528,974
Comprehensive Income 11,175,559 11,181,603 17,325,712
Less: Comprehensive income attributable to noncontrolling interests (15,148) (23,523) (88,528)
Comprehensive Income Attributable to the Company $ 11,160,411 $ 11,158,080 $ 17,237,184