Equity (Details) - USD ($)	1 Months Ended		3 Months Ended
	Jan. 31, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Mar. 11, 2016
Equity incentive plans
Dividends declared per share (in dollars per share)			$ 0
Share Buyback
Shares repurchased (in shares)			1,200
Beneficial interest purchased, price per share (in dollars per share)			$ 8.21
Beneficial interest purchased, value			$ 9,000
Per Share Data
Basic and diluted shares outstanding (in shares)			13,898,626	14,101,056
New Share Repurchase Program
Share Buyback
Beneficial interest purchased authorized amount						$ 5,000,000
Restricted Stock
Restricted Shares
Compensation expense			$ 214,000	$ 230,000
Deferred unearned compensation			$ 1,875,000		$ 2,089,000
Remaining weighted average vesting period			2 years 7 months 18 days
Incentive Plan 2016
Restricted Shares
Shares authorized for issuance (up to) (in shares)			600,000
Incentive Plan 2016 | Restricted Stock Units (RSUs)
Restricted Shares
Issued (in shares)		450,000
Vesting period for shares issued			5 years
Compensation expense			$ 110,000
Deferred unearned compensation			$ 1,862,000		$ 1,972,000
Incentive Plan 2016 | Restricted Stock
Restricted Shares
Vesting period for shares issued			5 years
Incentive Plan 2012 and Incentive Plan 2009
Restricted Shares
Number of additional awards available for grant (in shares)			0
Incentive Plan 2012 and Incentive Plan 2009 | Restricted Stock
Restricted Shares
Shares outstanding (in shares)			666,775
Subsequent Event | Incentive Plan 2016 | Restricted Stock
Restricted Shares
Issued (in shares)	147,050