Quarterly report pursuant to Section 13 or 15(d)

Notes Payable and Revolving Credit Facility (Scheduled Principal Payments Due On Cantor Loan Note Payable) (Details)

v3.8.0.1
Notes Payable and Revolving Credit Facility (Scheduled Principal Payments Due On Cantor Loan Note Payable) (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2016
Sep. 25, 2015
Cantor Loan [Member]        
Debt Instrument [Line Items]        
2018 $ 0      
2019 0      
2020 0      
2021 315,000      
2022 449,000      
Thereafter 31,333,000      
Total 32,097,000   $ 32,097,000  
West Mifflin Note Payable [Member]        
Debt Instrument [Line Items]        
2018 22,000      
2019 136,000      
2020 7,220,000      
Total $ 7,378,000 $ 7,378,000   $ 7,378