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Share-Based Compensation And Share Repurchase Plans (Narrative) (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended |
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Dec. 08, 2021 | Aug. 11, 2021 | Dec. 16, 2020 | Dec. 16, 2020 | Mar. 10, 2020 | Mar. 05, 2020 | Apr. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2018 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | 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 |  |  |  |  |  |  |  |  |  | $ 248,000 |  |  | $ 248,000 |
Recognition period of unrecognized compensation cost |  |  |  |  |  |  |  |  |  | 1 year 1 month 20 days |  |  |  |
Intrinsic unrealized value of all options outstanding, vested and expected to vest |  |  |  |  |  |  |  |  |  |  |  | $ 136,350,000 |  |
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 |  |  |  |  |  |  |  |  |  | $ 402,000 | $ 460,000 | 458,000 |  |
Proceeds from stock option exercises |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 906,000 |  |
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 |  |  |  |  |  |  |  |  |  |  | 735,738 |  |  |
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 | 219,408 |  |
Class A [Member] | 2020 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock shares remaining for future issuances |  |  |  |  |  |  |  |  |  | 183,692 |  |  | 183,692 |
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 |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 1,800,000 | $ 1,000,000.0 |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  | $ 2,900,000 |
Vesting period of stock options and RSU |  |  |  | 1 year |  |  |  |  |  | 4 years |  |  |  |
Number of options, Granted |  |  |  | 114,803 | 287,163 |  | 262,830 |  |  | 1,059,108 |  |  |  |
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 | 48,951 | 26,924 | 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 |  |  |  |  |  |  |  |  |  |  |
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 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=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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