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Summary of Significant Accounting Policies (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Interest rate swaps [Member] |  |
Liabilities: |  |
Liabilities fair value nonrecurring basis | $ 21,611 | $ 37,346
Cash and money market accounts [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis | 4,252,020 | 5,150,344
Bank certificates of deposit [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis | 2,978,355 | 5,474,013
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 | 4,252,020 | 5,150,344
Level 1 [Member] | Bank certificates of deposit [Member] |  |
Assets: |  |
Assets fair value nonrecurring basis |  |
Level 2 [Member] | Interest rate swaps [Member] |  |
Liabilities: |  |
Liabilities fair value nonrecurring basis | 21,611 | 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 | 2,978,355 | 5,474,013
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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