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Stock Compensation Plans: Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 28, 2020 | Jan. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate intrinsic value of options exercised | $ 640 | $ 864 |  |  |
Share-based compensation, nonvested awards, future recognition of compensation cost, Stock Options | $ 595 |  |  |  |
Unrecognized compensation cost, weighted average period for recognition (in years) | 2 years 4 months 9 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) | 25,556 |  |  |  |
Equity Incentive Plan 2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) | 299,500 |  |  | 350,000 |
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] |  |  |  |  |
Number of shares authorized (in shares) | 300,000 |  |  |  |
Award vesting percentage (as a percent) | 20.00% |  |  |  |
Award vesting period (in years) | 5 years |  |  |  |
Expiration period (in years) | 10 years |  |  |  |
Stock options granted during period (in shares) | 69,150 | 46,840 | 45,950 |  |
Stock options, aggregate grant date fair value | $ 187 | $ 240 | $ 206 |  |
Stock options vested during period (in shares) | 58,548 | 77,540 | 76,450 |  |
Stock options vested during period, aggregate grant date fair value | $ 176 | $ 203 | $ 181 |  |
Number of unvested stock options (in shares) | 159,192 | 160,750 |  |  |
Unvested stock awards, aggregate grant date fair value | $ 571 | $ 605 |  |  |
Unvested stock options, aggregate intrinsic value | 99 |  |  |  |
Stock options, outstanding, aggregate intrinsic value | $ 1,416 | $ 3,854 | $ 5,813 |  |
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 |  |  |  |
Number of unvested stock awards (in shares) | 0 | 0 |  |  |
Stock Grants | MRDP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock awards, granted during period (in shares) | 0 | 0 |  |  |

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