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Common Stock Repurchase (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Apr. 24, 2018 | May 02, 2017
Shares repurchased, value |  | $ 1,071,000 | $ 748,000 | $ 938,000 |  |
May 2018 authorized repurchase program |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 20,000,000 |
Shares repurchased |  | 0 |  |  |  |
May 2017 authorized repurchase program |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 20,000,000
Shares repurchased | 28,691 |  |  |  |  |
Shares repurchased, value | $ 300,000 |  |  |  |  |

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