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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net Income	$ 9,767,107	$ 9,178,122	$ 19,046,986	$ 18,690,744
Less: Net income attributable to redeemable noncontrolling interest	(52,555)	0	(66,771)	0
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 9,714,552	$ 9,178,122	$ 18,980,215	$ 18,690,744
Weighted average shares outstanding
Basic (in shares)	3,410,751	3,287,751	3,399,740	3,253,144
Dilutive impact of restricted stock grants with forfeitable rights to dividends (in shares)	0	73,485	0	73,715
Dilutive impact of restricted stock units (in shares)	4,441	6,044	3,458	4,662
Diluted (in shares)	3,415,192	3,367,280	3,403,198	3,331,521
Earnings per share
Basic (USD per share)	$ 2.85	$ 2.79	$ 5.58	$ 5.75
Diluted (USD per share)	$ 2.84	$ 2.73	$ 5.58	$ 5.61

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