Equity - Narrative (Details) - USD ($)		1 Months Ended			3 Months Ended		6 Months Ended
	Mar. 27, 2018	May 08, 2018	Mar. 31, 2018	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jan. 11, 2018	Sep. 30, 2017	Sep. 05, 2017
Equity incentive plans
Dividends declared per share (in dollars per share)	$ 0.0020
Per Share Data
Effect of diluted securities (in shares)					200,000	0	200,000	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	$ 146,000	$ 220,000
Restricted Stock
Restricted Shares
Compensation expense					224,000	$ 276,000	467,000	$ 490,000
Deferred unearned compensation			$ 3,603,000		$ 3,603,000		$ 3,603,000			$ 2,356,000
Remaining weighted average vesting period							3 years 6 months
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)			706,247		706,247		706,247
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			$ 870,000		$ 870,000		$ 870,000			$ 1,015,000
Incentive Plan 2016 | Restricted Stock
Restricted Shares
Vesting period for shares issued							5 years
Incentive Plan 2012
Restricted Shares
Number of additional awards available for grant (in shares)			0		0		0
Private placement
Equity incentive plans
Common stock issued in offering									$ 20,000,000
Shares sold in offering					113,566
Aggregate net proceeds from stock offering					$ 1,401,000
Payments for commissions					30,000
Professional fees					$ 63,000
Subsequent Event | Private placement
Equity incentive plans
Shares sold in offering		62,400
Aggregate net proceeds from stock offering		$ 734,000
Payments for commissions		$ 16,000