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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