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Summary of Significant Accounting Policies (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Assets:    
Cash and money market accounts $ 3,060,470 $ 3,798,811
Interest rate swaps 57,628  
Liabilities:    
Interest rate swaps   (996)
Total 3,118,098 3,797,815
Level 1 [Member]    
Assets:    
Cash and money market accounts 3,060,470 3,798,811
Interest rate swaps  
Liabilities:    
Interest rate swaps  
Total 3,060,470 3,798,811
Level 2 [Member]    
Assets:    
Cash and money market accounts
Interest rate swaps 57,628  
Liabilities:    
Interest rate swaps   (996)
Total 57,628 (996)
Level 3 [Member]    
Assets:    
Cash and money market accounts
Interest rate swaps  
Liabilities:    
Interest rate swaps  
Total