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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Unrealized holding gains arising during the period, tax expense (benefit) $ (206,565) $ (23,286) $ (786,997) $ 444,467
Reclassification adjustment for losses included in net income, tax expense $ 0 $ 54,533 $ (280) $ 54,533