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Summary of Significant Accounting Policies (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Assets fair value nonrecurring basis | $ 3,798,811 | $ 5,150,344
Liabilities: |  |
Total | 3,797,815 | 10,587,011
Interest rate swaps [Member] |  |
Liabilities: |  |
Liabilities fair value nonrecurring basis | (996) | (37,346)
Cash and money market accounts [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis | 3,798,811 | 5,150,344
Bank certificates of deposit [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis |  | 5,474,013
Level 1 [Member] |  |
Liabilities: |  |
Total | 3,798,811 | 5,150,344
Level 1 [Member] | Interest rate swaps [Member] |  |
Liabilities: |  |
Liabilities fair value nonrecurring basis |  |
Level 1 [Member] | Cash and money market accounts [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis | 3,798,811 | 5,150,344
Level 1 [Member] | Bank certificates of deposit [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis |  |
Level 2 [Member] |  |
Liabilities: |  |
Total | (996) | 5,436,667
Level 2 [Member] | Interest rate swaps [Member] |  |
Liabilities: |  |
Liabilities fair value nonrecurring basis | (996) | (37,346)
Level 2 [Member] | Cash and money market accounts [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis |  |
Level 2 [Member] | Bank certificates of deposit [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis |  | 5,474,013
Level 3 [Member] |  |
Liabilities: |  |
Total |  |
Level 3 [Member] | Interest rate swaps [Member] |  |
Liabilities: |  |
Liabilities fair value nonrecurring basis |  |
Level 3 [Member] | Cash and money market accounts [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis |  |
Level 3 [Member] | Bank certificates of deposit [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis |  |

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