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Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Computation for earnings per share
Net Income	$ 51,601,669	$ 46,594,132	$ 37,074,497
Less: Net income attributable to redeemable noncontrolling interest	(1,612,712)	(542,209)	0
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 49,988,957	$ 46,051,923	$ 37,074,497
Weighted average number of outstanding shares
Weighted average number of outstanding shares (in shares)	3,448,824	3,407,408	3,277,920
Dilutive impact of restricted stock grants with forfeitable rights to dividends (in shares)	0	0	74,957
Dilutive impact of restricted stock units (in shares)	3,014	5,983	6,909
Weighted average number of outstanding shares - Diluted (in shares)	3,451,838	3,413,391	3,359,786
Earnings per share attributable to common shareholders
Basic (per share)	$ 14.49	$ 13.52	$ 11.31
Diluted (per share)	$ 14.48	$ 13.49	$ 11.03

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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