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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net Income	$ 13,158,099	$ 13,668,965	$ 39,250,567	$ 32,715,951
Less: Net income attributable to redeemable noncontrolling interest	(459,252)	(242,401)	(1,156,385)	(309,172)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 12,698,847	$ 13,426,564	$ 38,094,182	$ 32,406,779
Weighted average shares outstanding
Basic (in shares)	3,454,178	3,413,164	3,442,402	3,405,460
Dilutive impact of restricted stock units (in shares)	7,240	6,959	5,574	4,748
Diluted (in shares)	3,461,418	3,420,123	3,447,976	3,410,208
Earnings per share
Basic (USD per share)	$ 3.68	$ 3.93	$ 11.07	$ 9.52
Diluted (USD per share)	$ 3.67	$ 3.93	$ 11.05	$ 9.50

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