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Summary of Significant Accounting Policies (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Cash and money market accounts | $ 2,514,519 | $ 3,798,811
Interest rate swaps | 79,283 |
Liabilities: |  |
Interest rate swaps |  | (996)
Level 1 [Member] |  |
Assets: |  |
Cash and money market accounts | 2,514,519 | 3,798,811
Interest rate swaps |  |
Liabilities: |  |
Interest rate swaps |  |
Level 2 [Member] |  |
Assets: |  |
Cash and money market accounts |  |
Interest rate swaps | 79,283 |
Liabilities: |  |
Interest rate swaps |  | (996)
Level 3 [Member] |  |
Assets: |  |
Cash and money market accounts |  |
Interest rate swaps |  |
Liabilities: |  |
Interest rate swaps |  |

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