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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 |

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