CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Debt Instrument [Line Items]
Real estate properties, net of accumulated depreciation	$ 64,290	$ 41,995
Preferred shares, par value (in dollars per share)	$ 0.01	$ 1.0
Preferred shares, authorized (in shares)	2,000,000	10,000,000
Preferred shares, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 3.0
Common stock, issued (in shares)	13,333,000	13,232,000
Common stock, authorized (in shares)	300,000,000
Shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 3.0
Shares of beneficial interest, issued (in shares)	13,333,000	13,232,000
Real estate investment property, net	$ 902,281	$ 759,576
Commitments and contingencies
Deferred mortgage costs	6,727	6,275
Cash and cash equivalents	12,383	27,399
Deposits and escrows	27,839	18,972
Other assets	9,359	7,775
Real estate properties held for sale	8,969	33,996
Mortgages payable	697,826	588,457
Accounts payable and accrued liabilities	22,348	20,716
Mortgage payable held for sale	0	27,052
Mortgages
Debt Instrument [Line Items]
Deferred mortgage costs	6,345	5,873
Junior subordinated notes
Debt Instrument [Line Items]
Deferred mortgage costs	382	402
Variable interest entity
Debt Instrument [Line Items]
Real estate properties, net of accumulated depreciation	52,873	35,525
Real estate investment property, net	707,546	686,101
Cash and cash equivalents	8,626	11,855
Deposits and escrows	13,873	19,505
Other assets	8,148	3,584
Real estate properties held for sale	8,969	33,996
Mortgages payable	558,568	535,602
Accounts payable and accrued liabilities	14,419	17,893
Mortgage payable held for sale	0	27,052
Variable interest entity | Mortgages
Debt Instrument [Line Items]
Deferred mortgage costs	$ 5,170	$ 4,856