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Consolidated Statements Of Comprehensive Income - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 19,515,452 $ 12,549,053 $ 9,672,498
Other comprehensive income (loss), before tax:      
Amortization related to prior year service cost 0 4,390 2,217
Amortization of unrecognized loss 8,941 3,514 0
Accumulated postretirement benefit obligation adjustment (566) (63,566) (47,121)
Unrealized gains (losses) on investments arising during the period 1,145,529 (2,077,542) 2,848,256
Reclassification adjustment for sale of securities included in net income (972,672) (718,837) (518,279)
Reclassification adjustment for write-down of securities included in net income 233,941 751,059 14,542
Other comprehensive income (loss), before tax 415,173 (2,100,982) 2,299,615
Income tax expense (benefit) related to postretirement health benefits 2,849 (18,924) (15,269)
Income tax expense (benefit) related to unrealized gains (losses) on investments arising during the year 387,508 (722,226) 974,145
Income tax benefit related to reclassification adjustment for sale of securities included in net income (333,426) (245,200) (173,403)
Income tax expense related to reclassification adjustment for write-down of securities included in net income 79,810 258,862 5,037
Net income tax expense (benefit) on other comprehensive income (loss) 136,741 (727,488) 790,510
Other comprehensive income (loss) 278,432 (1,373,494) 1,509,105
Comprehensive Income 19,793,884 11,175,559 11,181,603
Less: Comprehensive loss (income) attributable to noncontrolling interests 7,666 (15,148) (23,523)
Comprehensive Income Attributable to the Company $ 19,801,550 $ 11,160,411 $ 11,158,080