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Investments in Unconsolidated Ventures (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
property
investment
property_unit
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
property
investment
property_unit
Mar. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Number of properties | property 34   34  
Carrying Value     $ 0 $ 14,394,000
Equity in loss of unconsolidated joint ventures $ 63,000 $ 0 $ 88,000 $ 0
Joint venture, forty six percent ownership        
Schedule of Equity Method Investments [Line Items]        
Number of real estate properties, to be constructed | property_unit 339   339  
Other investments        
Schedule of Equity Method Investments [Line Items]        
Carrying Value     $ 208,000  
Unconsolidated joint ventures        
Schedule of Equity Method Investments [Line Items]        
Number of properties | investment 1,026   1,026  
Carrying Value     $ 20,845,000  
Mortgage Debt $ 66,350,000   $ 66,350,000  
Columbia, SC | Joint venture, thirty two percent ownership        
Schedule of Equity Method Investments [Line Items]        
Number of properties | investment 374   374  
Carrying Value     $ 4,832,000  
Mortgage Debt $ 41,000,000   $ 41,000,000  
Percent Ownership 32.00%   32.00%  
Columbia, SC (Location 2) | Joint venture, forty six percent ownership        
Schedule of Equity Method Investments [Line Items]        
Number of properties | investment 339   339  
Carrying Value     $ 8,665,000  
Mortgage Debt $ 0   $ 0  
Percent Ownership 46.00%   46.00%  
Forney, TX | Joint venture, fifty percent ownership        
Schedule of Equity Method Investments [Line Items]        
Number of properties | investment 313   313  
Carrying Value     $ 7,140,000  
Mortgage Debt $ 25,350,000   $ 25,350,000  
Percent Ownership 50.00%   50.00%  
Secured Debt | Joint venture, forty six percent ownership        
Schedule of Equity Method Investments [Line Items]        
Construction financing $ 47,000   $ 47,000  
Interest rate 4.08%   4.08%