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Note 9 - Stock-based Compensation (Details Textual) - USD ($) |  |  | 3 Months Ended
--- | --- | --- | ---
May 17, 2023 | Jul. 01, 2020 | Mar. 31, 2024 | Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) | 575,000 |  |  |
Fungible Share Reserve Feature, Shares Subject for Each Share Granted (in shares) |  | 1 |  |
Fungible Share Reserve Feature, Shares Subject to All Other Awards (in shares) |  | 1.8 |  |
Maximum Number of Shares of Class A Common Stock Awarded to any Participant in the Incentive Plan in any Calendar Year (in shares) |  | 500,000 |  |
Maximum Cash Awarded to any Participant in the Incentive Plan in any Calendar Year |  | $ 4,000,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 1,228,434 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  | 4,775,000 |
Payment, Tax Withholding, Share-Based Payment Arrangement |  |  | $ 339,000 | $ 1,485,000
Common Class A [Member] |  |  |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  | 6,879 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share) |  |  | $ 49.27 |
Payment, Tax Withholding, Share-Based Payment Arrangement |  |  | $ 300,000 |
Restricted Stock [Member] |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | 100,000 | 500,000
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | 700,000 | 1,000,000
Salaries Wages And Related Expenses [Member] |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | 800,000 | 1,500,000
General and Administrative Expense [Member] | Director [Member] |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | $ 200,000 | $ 100,000

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- Definition The maximum number of shares of the Class A common stock that can be awarded to a participant in the incentive plan in any calendar-year. + References No definition available. + Details
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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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