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Basic and Diluted Net Income Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic income per share
Net Income for the period - numerator	$ 3,610,790	$ 5,860,950	$ 8,292,481	$ 10,713,874
Weighted average common stock outstanding - denominator	18,459,775	18,350,186	18,453,754	18,348,464
Net income per share	$ 0.20	$ 0.32	$ 0.45	$ 0.58
Diluted income per share
Net Income for the period - numerator	$ 3,610,790	$ 5,860,950	$ 8,292,481	$ 10,713,874
Weighted average common stock outstanding - denominator	18,459,775	18,350,186	18,453,754	18,348,464
Effect of dilution
Weighted average common stock outstanding - denominator	18,459,775	18,350,186	18,453,754	18,348,464
Diluted income per share	$ 0.20	$ 0.32	$ 0.45	$ 0.58

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- Definition

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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