Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income (Loss) Per Share
Number of additional common shares or restricted stock awards included in the denominator as their affect is anti-dilutive	0	0	0	0
Numerator: Basic and Diluted
Net income	$ 6,602	$ 2,096	$ 24,702	$ (2,619)
Dividends paid	(2,738)	(2,729)	(8,214)	(8,174)
Undistributed income (loss)	$ 3,864	$ (633)	$ 16,488	$ (10,793)
Percentage allocated to common shares	99.10%	99.70%	99.10%	100.00%
Undistributed income (loss) allocated to common shares	$ 3,829	$ (631)	$ 16,339	$ (10,793)
Dividends paid on common shares outstanding	2,713	2,722	8,140	8,174
Net income (loss) available to common shares	$ 6,542	$ 2,091	$ 24,479	$ (2,619)
Denominator: Basic and Diluted
Weighted average common shares outstanding	12,333,550	12,310,955	12,330,994	12,281,960
Adjustment for dilutive potential common shares	13,244	24,906	12,678
Weighted average shares - Diluted	12,346,794	12,335,861	12,343,672	12,281,960
Per common share net income (loss)
Basic (in dollars per share)	$ 0.53	$ 0.17	$ 1.99	$ (0.21)
Diluted (in dollars per share)	$ 0.53	$ 0.17	$ 1.98	$ (0.21)