CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Real estate properties, net of accumulated depreciation	$ 67,643	$ 64,290
Mortgage payable and junior subordinated notes, deferred costs	$ 6,922	$ 6,727
Preferred shares, par value (in dollars per share)	$ 0.01
Preferred shares, authorized (in shares)	2,000,000
Preferred shares, outstanding (in shares)	0
Common stock, par value (in dollars per share)	$ 0.01
Common stock, authorized (in shares)	300,000,000
Common stock, outstanding (in shares)	13,575,000	13,333,000
Real estate properties, net	$ 993,250	$ 902,281
Cash and cash equivalents	30,974	12,383
Deposits and escrows	23,655	27,839
Other assets	7,005	9,359
Real estate property held for sale	0	8,969
Mortgages payable	743,225	697,826
Accounts payable and accrued liabilities	17,002	22,348
Mortgages payable
Debt Instrument [Line Items]
Mortgage payable and junior subordinated notes, deferred costs	6,550	6,345
Junior subordinated notes
Debt Instrument [Line Items]
Mortgage payable and junior subordinated notes, deferred costs	372	382
Variable interest entity
Debt Instrument [Line Items]
Real estate properties, net of accumulated depreciation	48,037	52,873
Real estate properties, net	625,714	707,546
Cash and cash equivalents	9,228	8,626
Deposits and escrows	8,632	13,873
Other assets	5,765	8,148
Real estate property held for sale	0	8,969
Mortgages payable	479,093	558,568
Accounts payable and accrued liabilities	7,550	14,419
Variable interest entity | Mortgages payable
Debt Instrument [Line Items]
Mortgage payable and junior subordinated notes, deferred costs	$ 4,189	$ 5,170