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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