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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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