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Stock-based Compensation - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024 | Jan. 27, 2015
Class Of Stock [Line Items] |  |  |  |  |  |
Stock compensation expense | $ 195,000 | $ 175,000 |  |  |  |
Board of Directors Fees |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock compensation expense | 130,000 | 118,000 | $ 368,000 | $ 375,000 |  |
Restricted Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock compensation expense | 65,000 | $ 57,000 | 191,000 | 169,000 |  |
Unrecognized expense | 46,000 |  | 46,000 |  | $ 150,000 |
Options |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock compensation expense | 0 |  | 0 |  |  |
Market Based Restricted Stock Units |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock compensation expense |  |  | 559,000 | $ 544,000 |  |
Unrecognized stock compensation | $ 380,000 |  | $ 380,000 |  | $ 0 |
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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