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Earnings Per Share (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Computation for earnings per share
Net income	$ 16,930,892	$ 14,352,968	$ 12,402,441
Weighted average number of outstanding shares
Basic	3,111,328	2,951,751	2,766,741
Diluted	3,111,328	2,951,751	2,767,895
Earnings per share
Basic	$ 5.44	$ 4.86	$ 4.48
Diluted	$ 5.44	$ 4.86	$ 4.48

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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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