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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net Income	$ 6,728,460	$ 6,350,580	$ 25,419,204	$ 19,028,213
Weighted average shares outstanding
Basic (in shares)	3,297,337	3,205,904	3,268,037	3,190,171
Dilutive impact of restricted stock grants with forfeitable rights to dividends (in shares)	74,154	69,646	74,267	66,613
Dilutive impact of restricted stock units (in shares)	7,709	5,212	5,892	3,480
Diluted (in shares)	3,379,200	3,280,762	3,348,196	3,260,264
Earnings per share
Basic (USD per share)	$ 2.04	$ 1.98	$ 7.78	$ 5.96
Diluted (USD per share)	$ 1.99	$ 1.94	$ 7.59	$ 5.84

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