Equity - Narrative (Details) - USD ($)		1 Months Ended			3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 25, 2018	Aug. 02, 2018	Mar. 31, 2018	Jun. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jan. 31, 2018	Sep. 30, 2017	Sep. 05, 2017
Equity incentive plans
Dividends declared per share (in dollars per share)	$ 0.20
Per Share Data
Effect of diluted securities (in shares)					0	0		133,333	0
New Share Repurchase Program
Share Buyback
Beneficial interest purchased authorized amount												$ 5,000,000
Shares repurchased (in shares)								0
Restricted Stock Units (RSUs)
Restricted Shares
Compensation expense					$ 73,000	$ 110,000		$ 219,000	$ 329,000
Restricted Stock
Restricted Shares
Compensation expense					287,000	$ 243,000		754,000	$ 733,000
Deferred unearned compensation					$ 3,313,000		$ 3,313,000	$ 3,313,000			$ 2,356,000
Remaining weighted average vesting period								2 years 7 months 6 days
Incentive Plan 2018
Equity incentive plans
Number of shares authorized					600,000		600,000	600,000
Incentive Plan 2018 | Restricted Stock
Restricted Shares
Issued (in shares)			144,797
Shares outstanding (in shares)					706,097		706,097	706,097
Incentive Plan 2016 | Restricted Stock Units (RSUs)
Restricted Shares
Issued (in shares)				450,000
Contingently issuable shares included in diluted earnings calculation (in shares)								200,000
Vesting period for shares issued								5 years
Deferred unearned compensation					$ 797,000		$ 797,000	$ 797,000			$ 1,015,000
Incentive Plan 2016 | Restricted Stock
Restricted Shares
Vesting period for shares issued								5 years
Prior Plan | Restricted Stock
Restricted Shares
Number of additional awards available for grant (in shares)					0		0	0
Private placement
Equity incentive plans
Common stock issued in offering										$ 30,000,000
Shares sold in offering					835,374
Payments for commissions					$ 218,000
Aggregate sales price					$ 10,525,000		$ 12,237,000
At-the-market
Equity incentive plans
Shares sold in offering							948,940
Subsequent Event | Private placement
Equity incentive plans
Shares sold in offering		558,777
Payments for commissions		$ 154,000
Aggregate sales price		$ 7,437,000