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Earnings Per Share (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Computation for earnings per share
Net income	$ 22,154,828	$ 16,930,892	$ 14,352,968
Weighted average number of outstanding shares
Basic (in shares)	3,142,083	3,111,328	2,951,751
Diluted (in shares)	3,194,263	3,111,328	2,951,751
Earnings per share
Basic (per share)	$ 7.05	$ 5.44	$ 4.86
Diluted (per share)	$ 6.94	$ 5.44	$ 4.86

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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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