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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net Income	$ 12,942,129	$ 13,125,448
Less: Net loss (income) attributable to redeemable noncontrolling interest	47,332	(368,553)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 12,989,461	$ 12,756,895
Weighted average shares outstanding
Basic (in shares)	3,487,923	3,428,888
Dilutive impact of restricted stock units (in shares)	4,015	6,441
Diluted (in shares)	3,491,938	3,435,329
Earnings per share
Basic (USD per share)	$ 3.72	$ 3.72
Diluted (USD per share)	$ 3.72	$ 3.71

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