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Share-Based Compensation and Stock Repurchases (Narrative) (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended | 36 Months Ended |
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Apr. 18, 2022 | Dec. 16, 2020 | Dec. 16, 2020 | Mar. 10, 2020 | Mar. 05, 2020 | Apr. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2018 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2022 | Mar. 14, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  |  |  |  |  |  |  | $ 36,000 |  |  |  | $ 36,000 |
Recognition period of unrecognized compensation cost |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Number of Stock Options, Granted |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Stock option expiry period |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  | $ 212,000 | $ 402,000 | $ 460,000 |  |  |
Proceeds from stock option exercises |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
2020 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock authorized for issuance |  |  |  |  |  |  |  |  |  |  | 1,250,000 |  |  |
Common Stock shares remaining for future issuances |  |  |  |  |  |  |  |  |  |  | 234,955 |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock authorized for issuance |  |  |  |  |  |  |  |  | 1,505,598 |  |  |  | 1,505,598 |
Number of Stock Options, Granted |  |  |  |  |  |  |  |  |  |  | 38,803 |  |  |
Class A [Member] | Maximum [Member] | 2020 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares authorized |  |  |  |  |  |  |  |  | 506,748 |  |  |  |  |
Class B [Member] | 2020 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock authorized for issuance |  |  |  |  |  |  |  |  |  | 200,000 |  | 200,000 |  |
2017 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |
Repurchase program, remaining amount authorized |  |  |  |  |  |  |  |  | $ 26,000,000.0 |  |  |  | $ 26,000,000.0 |
Stock buy-back program period |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
2017 Stock Repurchase Plan [Member] | Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase program, remaining amount authorized |  |  |  | $ 26,000,000.0 |  |  |  |  |  |  |  |  |  |
$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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase value |  |  |  |  |  |  |  |  | $ 24,000,000.0 |  |  |  | 24,000,000.0 |
Share price |  |  |  |  |  |  |  |  | $ 13.39 |  |  |  |  |
Shares repurchased plan, shares |  |  |  |  |  |  |  |  | 1,792,819 |  |  |  |  |
$25 Million Stock Repurchased At $8.92 [Member] | Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  | $ 8.92 |  |  |  |  |  |  |
Shares repurchased plan, shares |  |  |  |  |  |  | 75,157 |  |  |  |  | 0 |  |
$25 Million Stock Repurchased At $7.30 [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 |  |  |  |  |  |  |  |  | $ 1,700,000 | $ 1,800,000 |  |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  |  |  |  |  |  |  | $ 3,200,000 |  |  |  | $ 3,200,000 |
Vesting period of stock options and RSU |  |  | 1 year |  |  |  |  |  | 4 years |  |  |  |  |
Number of options, Granted |  |  | 114,803 | 287,163 |  | 262,830 |  |  | 1,561,690 |  |  |  |  |
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 |  |  | 100.00% |  |  |  |  | 100.00% | 25.00% |  |  |  |  |
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% |  |  |  |  |  |  |  |
Non-employee Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stock Options, Granted |  | 38,803 |  |  |  |  |  |  |  |  |  |  |  |
Non-employee Director [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options, Granted |  | 60,084 |  |  |  |  |  |  |  |  |  |  |  |
Non-employee Director [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% |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |
Non-employee Director [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% |  |  |  |  |  |  |  |  |  |  |  |
Non-employee Director [Member] | Restricted Stock Units (RSUs) [Member] | Tranche Three [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% |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |
Executive Management And Other Employees [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options, Granted | 428,899 |  |  |  |  |  |  |  |  |  |  |  |  |
Employees [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 |  |  |  |  |  |  |  |
Number of options, Granted |  |  |  |  |  | 22,888 |  |  |  |  |  |  |  |
Employees [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 |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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