Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Performance obligation, description of timing			one year or less
Net loss	$ (1,258)	$ (2,038)	$ (2,540)	$ (2,949)
Weighted-average common shares outstanding (basic and diluted) (in shares)	5,561,000	5,535,000	5,548,000	5,519,000
Net loss per share - basic and diluted (in dollars per share)	$ (0.23)	$ (0.37)	$ (0.46)	$ (0.53)
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	214,000	140,000	200,000	125,000
Restricted Stock
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)			0
Accounting Standards Update 2014-09 | Effect of Accounting Change
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	$ 258		$ 573
LIFO expense	508		508
Valuation reserves	$ 366		$ 366