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Note 6 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Share-Based Payment Arrangement, Expense |  |  | $ 4.7 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 2,777,066 |  | 2,777,066 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 3 years |
Share-Based Payment Arrangement, Expense | $ 2.0 | $ 1.9 | $ 4.7 | $ 4.1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 11.4 | $ 11.5 | $ 11.4 | $ 11.5
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 10 months 24 days |
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Cliff Vesting [Member] | Minimum [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 1 year |
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Cliff Vesting [Member] | Maximum [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 3 years |
Performance-based Restricted Stock Units [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Minimum [Member] |  |  |  |
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target | 0.00% |  | 0.00% |
Performance-based Restricted Stock Units [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Maximum [Member] |  |  |  |
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target | 150.00% |  | 150.00% |

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