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Derivatives (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 13, 2017 | Aug. 24, 2015 | Dec. 30, 2014 | Oct. 15, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |  |  |  |
Notional Amount of Interest Rate Cash Flow Hedge Derivatives |  |  |  | $ 25,000,000 | $ 25,000,000 | $ 25,000,000 | $ 25,000,000
Interest expense on derivatives | $ 406,200 | $ 668,300 | $ 763,500 |  |  |  |

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- Definition Interest expense on derivatives. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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