Summary of Significant Accounting Policies - Dilutive Effect of the Company's Restricted Shares and Performance Shares (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
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	$ (1,657)	$ (299)	$ (4,266)	$ (2,897)
Weighted-average common shares outstanding (basic) (in shares)	5,479,000	5,464,000	5,473,000	5,458,000
Effect of dilutive securities:
Weighted-average common shares outstanding (diluted) (in shares)	5,479,000	5,464,000	5,473,000	5,458,000
Net loss per share - basic (in dollars per share)	$ (0.30)	$ (0.05)	$ (0.78)	$ (0.53)
Net loss per share - diluted (in dollars per share)	$ (0.30)	$ (0.05)	$ (0.78)	$ (0.53)
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	120,000	17,000	90,000	15,000
Restricted Stock
Effect of dilutive securities:
Effect of diluted securities (in shares)	0	0	0	0
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)			0