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Stock Compensation Plans: Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Jan. 28, 2020 | Jan. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate intrinsic value of options exercised | $ 655,000 | $ 632,000 | $ 605,000 |  |
Share-based compensation, nonvested awards, future recognition of compensation cost, Stock Options | $ 490,000 |  |  |  |
Unrecognized compensation cost, weighted average period for recognition (in years) | 1 year 9 months 3 days |  |  |  |
2014 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  | 352,366
Number of shares available for grant (in shares) | 15,576 |  |  |  |
Equity Incentive Plan 2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) |  |  |  | 350,000 |
Number of shares available for grant (in shares) | 154,655 |  |  |  |
Equity Incentive Plan 2019 | Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) |  |  |  | 300,000 |
Equity Incentive Plan 2019 | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) |  |  |  | 50,000 |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) | 5 years |  |  |  |
Stock options granted during period (in shares) | 0 | 1,000 | 74,000 |  |
Stock options, aggregate grant date fair value |  | $ 9,000 | $ 508,000 |  |
Stock options vested during period (in shares) | 43,690 | 59,990 | 52,960 |  |
Stock options vested during period, aggregate grant date fair value | $ 235,000 | $ 316,000 | $ 239,000 |  |
Number of unvested stock options (in shares) | 77,230 | 130,120 |  |  |
Unvested stock awards, aggregate grant date fair value | $ 468,000 | $ 756,000 |  |  |
Unvested stock options, aggregate intrinsic value | 312,000 |  |  |  |
Stock options, outstanding, aggregate intrinsic value | 1,599,000 | 1,518,000 | $ 2,130,000 |  |
Share-based payment expense | $ 233,000 | $ 320,000 |  |  |
Stock Options | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |
Stock Options | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) | 5 years |  |  |  |
MRDP Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period (in years) | 10 years |  |  |  |
Number of unvested stock awards (in shares) | 49,015 | 26,150 | 0 |  |
Stock awards, granted during period (in shares) | 28,815 | 26,150 | 0 |  |
Unvested restricted stock | $ 1,435,000 |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost, weighted average period for recognition (in years) | 2 years 6 months 10 days |  |  |  |
Share-based payment expense | $ 157,000 |  |  |  |

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