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Note 8 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
|  | Nonvested Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested as of December 31, 2023 |  |  | 115,805 |  |  | $ | 17.85 |
Granted |  |  | 71,843 |  |  |  | 18.93 |
Vested |  |  | (76,643 | ) |  |  | 18.41 |
Forfeited/cancelled/expired |  |  | (1,848 | ) |  |  | 18.95 |
Nonvested as of June 30, 2024 |  |  | 109,157 |  |  | $ | 18.15 |
Schedule of Nonvested Performance-Based Units Activity [Table Text Block] |
|  | Units (expected) |  |  | Units (maximum) |  |  | Weighted Average Grant Date Fair Value |
Unearned as of December 31, 2023 |  |  | 164,231 |  |  |  |  |  |  | $ | 23.06 |
Awarded |  |  | 91,691 |  |  |  |  |  |  |  | 19.01 |
Change in estimate |  |  | (10,774 | ) |  |  |  |  |  |  | 11.93 |
Vested shares |  |  | (53,041 | ) |  |  |  |  |  |  | 25.24 |
Forfeited/cancelled/expired |  |  | (10,260 | ) |  |  |  |  |  |  | 23.10 |
Unearned as of June 30, 2024 |  |  | 181,847 |  |  |  | 302,196 |  |  | $ | 21.04 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Units (expected) |  |  | Weighted Average Grant Date Fair Value |
Unearned as of December 31, 2023 |  |  | 188,348 |  |  | $ | 22.11 |
Awarded |  |  | 81,736 |  |  |  | 19.01 |
Vested shares |  |  | (73,013 | ) |  |  | 22.98 |
Forfeited/cancelled/expired |  |  | (7,360 | ) |  |  | 21.53 |
Unearned as of June 30, 2024 |  |  | 189,711 |  |  | $ | 20.46 |

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