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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Income	$ 14,898,023	$ 12,967,019	$ 27,840,151	$ 26,092,467
Less: Net income attributable to redeemable noncontrolling interest	(527,655)	(328,580)	(480,323)	(697,133)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 14,370,368	$ 12,638,439	$ 27,359,828	$ 25,395,334
Weighted average shares outstanding
Basic (in shares)	3,518,665	3,443,783	3,503,379	3,436,391
Dilutive impact of restricted stock units (in shares)	1,151	5,345	1,757	4,631
Diluted (in shares)	3,519,816	3,449,128	3,505,136	3,441,022
Earnings per share
Basic (USD per share)	$ 4.08	$ 3.67	$ 7.81	$ 7.39
Diluted (USD per share)	$ 4.08	$ 3.66	$ 7.81	$ 7.38

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