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Earnings Per Share - Computation for Earnings Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net Income	$ 5,361,736	$ 4,166,786	$ 15,404,014	$ 12,106,236
Weighted average number of outstanding shares - Basic	3,160,039	3,153,585	3,135,466	3,095,409
Weighted average number of outstanding shares - Diluted	3,211,793	3,153,585	3,180,971	3,095,409
Earnings per share
Basic	$ 1.70	$ 1.32	$ 4.91	$ 3.91
Diluted	$ 1.67	$ 1.32	$ 4.84	$ 3.91

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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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