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Consolidated Statements Of Comprehensive Income - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]    
Net income $ 1,804,461 $ 1,726,124
Other comprehensive income, before tax:    
Amortization related to prior year service cost 0 1,097
Amortization of unrecognized loss 2,235 879
Unrealized gains on investments arising during the period 1,212,525 287,765
Reclassification adjustment for sales of securities included in net income (186,079) (8,803)
Reclassification adjustment for write-downs of securities included in net income 42,794 0
Other comprehensive income, before tax 1,071,475 280,938
Income tax expense related to postretirement health benefits 760 672
Income tax expense related to unrealized gains on investments arising during the period 419,586 103,538
Income tax benefit related to reclassification adjustment for sales of securities included in net income (64,860) (3,009)
Income tax expense related to reclassification adjustment for write-downs of securities included in net income 14,668 0
Net income tax expense on other comprehensive income 370,154 101,201
Other comprehensive income 701,321 179,737
Comprehensive Income 2,505,782 1,905,861
Comprehensive loss attributable to noncontrolling interests (9,579) 0
Comprehensive Income Attributable to the Company $ 2,515,361 $ 1,905,861