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Note 12 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Share-based Compensation, Tax Charges to Additional Paid in Capital From Exercise and Vesting | $ 0 | $ 0 |
Restricted Stock [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 206,629 | 146,227 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount | $ 6,400 | $ 3,600 |
Share-Based Payment Arrangement, Expense | 900 | 700 |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 9,500 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 3 years 7 months 6 days |  |
Restricted Stock [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) | 12 months |  |
Restricted Stock [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) | 60 months |  |
Share-Based Payment Arrangement, Option [Member] |  |  |
Share-Based Payment Arrangement, Expense | $ 100 | $ 200 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 3 months 18 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) | 0 | 0 |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 100 |  | $ 100
Employee Stock Purchase Plan [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 500,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 46,080 |  |
The Fourth Amended 2014 Plan [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 5,750,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 1,946,670 |  |

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