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Stock Compensation Plans: Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Jan. 28, 2020 | Jan. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate intrinsic value of options exercised | $ 632 | $ 605 | $ 1,143 |  |
Share-based compensation, nonvested awards, future recognition of compensation cost, Stock Options | $ 777 |  |  |  |
Unrecognized compensation cost, weighted average period for recognition (in years) | 2 years 1 month 28 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) | 5,036 |  |  |  |
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) | 176,050 |  |  |  |
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 |  |  |  |
Expiration period (in years) | 10 years |  |  |  |
Stock options granted during period (in shares) | 1,000 | 74,000 | 81,000 |  |
Stock options, aggregate grant date fair value | $ 9 | $ 508 | $ 502 |  |
Stock options vested during period (in shares) | 59,990 | 52,960 | 49,928 |  |
Stock options vested during period, aggregate grant date fair value | $ 316 | $ 239 | $ 170 |  |
Number of unvested stock options (in shares) | 130,120 | 191,910 |  |  |
Unvested stock awards, aggregate grant date fair value | $ 756 | $ 428 |  |  |
Unvested stock options, aggregate intrinsic value | 241 |  |  |  |
Stock options, outstanding, aggregate intrinsic value | $ 1,518 | $ 2,130 | $ 3,119 |  |
MRDP Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage (as a percent) | 20.00% |  |  |  |
Award vesting period (in years) | 5 years |  |  |  |
Expiration period (in years) | 10 years |  |  |  |

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