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Stock Compensation Plans (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Jan. 28, 2020 | Jan. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate intrinsic value of options exercised during the period |  | $ 947,000 | $ 628,000 |  |
Number of unvested stock options (shares) | 158,392 | 158,392 | 154,670 |  |
Unvested stock options, aggregate grant date fair value | $ 565,000 | $ 565,000 | $ 584,000 |  |
Unvested stock options, aggregate intrinsic value | 897,000 | $ 897,000 |  |  |
Stock options vested during period (shares) |  | 200 | 0 |  |
Stock options vested during period, aggregate grant date fair value | 1,000 |  |  |  |
Stock options, outstanding, aggregate intrinsic value | 2,990,000 | $ 2,990,000 | $ 1,410,000 |  |
Unrecognized compensation expense, non-vested options | $ 507,000 | $ 507,000 |  |  |
Unrecognized compensation expense, non-vested options, amortization period (in years) |  | 2 years 1 month 13 days |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) | 300,000 | 300,000 |  |  |
Award vesting percentage |  | 20.00% |  |  |
Award vesting period (years) |  | 5 years |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Contractual term |  | 10 years |  |  |
Equity Incentive Plan 2014 |  |  |  |  |
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) | 29,676 | 29,676 |  |  |
Equity Incentive Plan 2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) | 298,000 | 298,000 |  | 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 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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