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Mortgages Payable - Maturities (Details) - Mortgages Payable - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Debt    
Unamortized Premium Balance $ 5,900,000  
Remaining balance of deferred financing costs at period end 236,000 $ 324,000
Maturity of mortgages payable, excluding net premiums    
2018 21,900,000  
2019 20,700,000  
2020 82,400,000  
2021 67,000,000  
2022 109,700,000  
Thereafter 18,600,000  
Totals $ 320,300,000