CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Debt Instrument [Line Items]
Mortgage payable and junior subordinated notes, deferred costs	$ 5,588	$ 6,275
Accumulated depreciation	$ 45,371	$ 41,995
Preferred shares, par value (in dollars per share)	$ 1	$ 1
Preferred shares, authorized (in shares)	10,000,000	10,000,000
Preferred shares, issued (in shares)	0	0
Shares of beneficial interest, par value (in dollars per share)	$ 3	$ 3
Shares of beneficial interest, issued (in shares)	13,231,000	13,232,000
Mortgages payable
Debt Instrument [Line Items]
Mortgage payable and junior subordinated notes, deferred costs	$ 5,191	$ 5,873
Junior subordinated notes
Debt Instrument [Line Items]
Mortgage payable and junior subordinated notes, deferred costs	$ 397	$ 402