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Stock-based Compensation - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023 | Feb. 27, 2015
Class Of Stock [Line Items] |  |  |  |  |  |
Stock compensation expense | $ 175 | $ 228 | $ 369 | $ 533 |  |
Unrecognized stock compensation | 0 |  | 0 |  | $ 0 |
Board Of Directors Fees |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock compensation expense | 119 | 156 | 257 | 313 |  |
Restricted Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock compensation expense | 56 | 61 | 112 | 191 |  |
Unrecognized expense | 264 |  | 264 |  | $ 376 |
Options |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock compensation expense | $ 0 | $ 0 | $ 0 | $ 18 |  |
2015 Option Grants |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Number of shares authorized to be repurchased (up to) (in shares) |  |  |  |  |  | 1,250,000
2015 Option Grants | Minimum |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 1 year |  |  |
2015 Option Grants | Maximum |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 6 years |  |  |

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