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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net Income	$ 16,399,370	$ 13,158,099	$ 44,239,522	$ 39,250,567
Less: Net income attributable to redeemable noncontrolling interest	(1,191,317)	(459,252)	(1,671,640)	(1,156,385)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 15,208,053	$ 12,698,847	$ 42,567,882	$ 38,094,182
Weighted average shares outstanding
Weighted average number of outstanding shares - Basic (in shares)	3,530,586	3,454,178	3,512,547	3,442,402
Dilutive impact of restricted stock units (in shares)	1,760	7,240	1,970	5,574
Weighted average number of outstanding shares - Diluted (in shares)	3,532,346	3,461,418	3,514,517	3,447,976
Earnings per share
Basic (USD per share)	$ 4.31	$ 3.68	$ 12.12	$ 11.07
Diluted (USD per share)	$ 4.31	$ 3.67	$ 12.11	$ 11.05

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