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Note 4 - Stock-based Compensation (Details Textual) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) | 1,900,000 |  |  |  |
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) | 1.80 |  |  |  |
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 | 500,000 |  |  | 200,000
Maximum Cash Awarded to any Participant in the Incentive Plan in any Calendar Year | $ 4,000,000 | $ 4,000,000 |  |  | $ 2,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 872,509 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 4,200,000 |
Payment, Tax Withholding, Share-Based Payment Arrangement |  | 1,606,000 | $ 1,332,000 |  |
Share-Based Payment Arrangement, Expense, Tax Benefit |  | 400,000 | (300,000) |  |
Proceeds from Stock Options Exercised |  | 384,000 | 0 |  |
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit |  | 100,000 | 0.0 |  |
Restricted Stock [Member] |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 4,200,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 2 years 1 month 6 days |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  | $ 3,400,000 | 4,900,000 |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | 4,500,000 |  |  |
Common Class A [Member] |  |  |  |  |
Payment, Tax Withholding, Share-Based Payment Arrangement |  | $ 1,600,000 | $ 500,000 |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  | 55,306 | 60,752 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share) |  | $ 29.03 | $ 21.87 |  |
Minimum [Member] |  |  |  |  |
Payment, Tax Withholding, Share-Based Payment Arrangement |  | $ 2,200,000 |  |  |
Maximum [Member] |  |  |  |  |
Payment, Tax Withholding, Share-Based Payment Arrangement |  |  | $ 2,400,000 |  |
Salaries Wages And Related Expenses [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | 6,000,000.0 | 7,500,000 |  |
General Supplies and Expenses [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 600,000 | $ 400,000 |  |

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