Net Income (Loss) Per Share - Computation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Numerator: Basic and Diluted
Net loss - Basic	$ (1,890)	$ (1,162)	$ (2,562)	$ (934)
Net loss - Diluted	(1,890)	(1,162)	(2,562)	(934)
Dividends paid	(2,752)	(2,746)	(5,505)	(5,492)
Undistributed loss - Basic	(4,642)	(3,908)	(8,067)	(6,426)
Undistributed loss - Diluted	$ (4,642)	$ (3,908)	$ (8,067)	$ (6,426)
Percentage allocated to common shares	100.00%	100.00%	100.00%	100.00%
Undistributed income (loss) allocated to common shares - Basic	$ (4,642)	$ (3,870)	$ (8,067)	$ (6,364)
Undistributed income (loss) allocated to common shares - Diluted	(4,642)	(3,870)	(8,067)	(6,364)
Dividends paid on common shares outstanding	2,727	2,719	5,453	5,439
Net income (loss) available to common shares - Basic	(1,915)	(1,151)	(2,614)	(925)
Net income (loss) available to common shares - Diluted	$ (1,915)	$ (1,151)	$ (2,614)	$ (925)
Denominator: Basic and Diluted
Weighted average common shares outstanding - Basic	12,400,522	12,360,369	12,391,264	12,352,926
Weighted average shares - Diluted	12,400,522	12,360,369	12,391,264	12,352,926
Basic net income (loss) per share (in dollars per share)	$ (0.15)	$ (0.09)	$ (0.20)	$ (0.07)
Diluted net income (loss) per share (in dollars per share)	$ (0.15)	$ (0.09)	$ (0.20)	$ (0.07)