Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Performance obligation, description of timing	one year or less
Net loss	$ (1,282)	$ (911)
Weighted-average common shares outstanding (basic and diluted) (in shares)	5,535,000	5,502,000
Net loss per share - basic and diluted (in dollars per share)	$ (0.23)	$ (0.17)
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	186,000	110,000
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	$ 316
LIFO expense	508
Valuation reserves	$ 366