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Stock-Based Compensation And Stock Repurchases (Narrative) (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 21, 2023 | Apr. 11, 2023 | Mar. 05, 2020 | Apr. 30, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Mar. 10, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  |  | $ 26,000,000.0 |  | $ 26,000,000.0 |  |  |
Share conversion ratio |  |  |  |  |  |  | 1 |  |  |
Number of Stock Options, Granted |  |  |  |  |  |  | 0 |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  | 9,000 | $ 53,000 | $ 27,000 | $ 159,000 |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  |  |  | 9,000 |  | $ 9,000 |  |  |
Recognition period of unrecognized compensation cost |  |  |  |  |  |  | 3 months |  |  |
Share price |  |  |  |  |  |  | $ 2.12 |  |  |
Intrinsic unrealized value of all options outstanding, vested and expected to vest |  |  |  |  |  |  |  |  |  |
Minimum [Member] | 2020 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  |  | 1 year |  |  |
Maximum [Member] | 2020 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  |  | 4 years |  |  |
Stock option expiry period |  |  |  |  |  |  | 5 years |  |  |
Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  | $ 13.39 |  |  |
Shares repurchased plan, shares |  |  |  |  |  |  | 1,792,819 |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares repurchased plan, shares |  |  |  |  |  |  | 0 | 0 |  |
Class A [Member] | 2020 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock authorized for issuance |  |  |  |  | 1,250,000 |  | 1,250,000 |  |  |
Additional shares authorized |  |  |  |  |  |  | 278,193 |  |  |
$25 Million Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  |  |  |  |  |  |  | $ 25,000,000.0
$25 Million Stock Repurchase Program [Member] | Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share price |  |  | $ 7.30 |  |  |  |  |  |  |
Shares repurchased plan, shares |  |  | 25,000 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  | $ 604,000 | $ 444,000 | $ 1,300,000 | $ 1,200,000 |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  |  |  | $ 4,100,000 |  | $ 4,100,000 |  |  |
Vesting period of stock options and RSU |  |  |  |  |  |  | 1 year 5 months 23 days |  |  |
Number of options, Granted | 52,350 | 85,139 |  |  |  |  | 2,233,372 |  | 697,515 |
Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  |  | 4 years |  |  |
Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 75.00% |  |  |  |  |  |
Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  |  |  |  |
Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of options, Granted |  |  |  |  |  |  | 339,438 |  | 189,880 |
Management [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  |  | 4 years |  |  |
Percentage of shares vested |  |  |  |  |  |  | 25.00% |  |  |
Number of options, Granted |  |  |  |  |  |  | 1,893,934 |  | 507,635 |
Non-employee Director [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  |  | 1 year |  |  |
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  |  | 4 years |  |  |
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 50.00% |  |  |  |  |  |
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 50.00% |  |  |  |  |  |

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