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Note 11 - Stockholders' Equity and Stock-based Compensation (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2023
Share-Based Payment Arrangement, Expense | $ 0.4 | $ 0.6 | $ 0.8 | $ 1.2 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 0 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  |  | 0 | 0 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares) |  |  | 11,623 | 58,762 |
Participant [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Grant Limit (in shares) |  |  | 2,000,000 |  |
Non Employee Board Member [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Grant Limit (in shares) |  |  | 100,000 |  |
Amended And Restated2019 Long Term Incentive Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 5,500,000 |  | 5,500,000 |  | 4,000,000

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