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Quarterly Financial Data (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
Quarterly Financial Data (Unaudited) (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Information [Line Items]
Revenue	$ 14,323,000us-gaap_Revenues	$ 13,757,000us-gaap_Revenues	$ 12,904,000us-gaap_Revenues	$ 12,575,000us-gaap_Revenues	$ 11,716,000us-gaap_Revenues	$ 11,272,000us-gaap_Revenues	$ 10,601,000us-gaap_Revenues	$ 9,928,000us-gaap_Revenues	$ 53,558,857us-gaap_Revenues	$ 43,517,664us-gaap_Revenues	$ 34,624,362us-gaap_Revenues
Net Income	$ 5,723,000us-gaap_ProfitLoss	$ 4,966,000us-gaap_ProfitLoss	$ 2,716,000us-gaap_ProfitLoss	$ 5,509,000us-gaap_ProfitLoss	$ 5,622,000us-gaap_ProfitLoss	$ 4,646,000us-gaap_ProfitLoss	$ 4,530,000us-gaap_ProfitLoss	$ 5,392,000us-gaap_ProfitLoss	$ 18,913,009us-gaap_ProfitLoss	$ 20,189,611us-gaap_ProfitLoss	$ 18,603,594us-gaap_ProfitLoss
Earnings per Share - diluted (in dollars per share)	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 1.24us-gaap_EarningsPerShareDiluted	$ 1.50us-gaap_EarningsPerShareDiluted	$ 1.62us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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