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Note 7 - Employee and Director Benefits (Details Textual) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2025 | Mar. 31, 2024
Share-Based Payment Arrangement, Expense |  | $ 864,000.0 | $ 958,000.0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  | 0 | 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares |  | 0 |
Restricted Stock [Member] |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 5.9 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 2 years 6 months |
Performance Shares [Member] |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 1.2 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 1 year 7 months 6 days |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 3 years |
Performance Shares [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Vested Upon Certain Performance Metrics, Percentage |  | 0.00% |
Performance Shares [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Vested Upon Certain Performance Metrics, Percentage |  | 150.00% |
The 2009 Plan [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized | 5,550,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period | 10 years |  |

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