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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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