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Note 7 - Employee and Director Benefits (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | Average |  |  |  |  |
|  |  |  |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  |  |  |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
|  | Shares |  |  | Price |  |  | Term (years) |  |  | Value |
|  |  |  |  |  |  |  |  |  |  |  |  |  | (In Thousands) |
Six Months Ended June 30, 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at January 1, 2025 |  |  | 80,450 |  |  | $ | 26.03 |  |  |  | 1.9 |  |  | $ | 4,723 |
Exercised |  |  | (27,950 | ) |  |  | 16.80 |  |  |  | - |  |  |  | 1,697 |
Outstanding at June 30, 2025 |  |  | 52,500 |  |  | $ | 30.95 |  |  |  | 2.3 |  |  | $ | 2,444 |
Exercisable at June 30, 2025 |  |  | 52,500 |  |  | $ | 30.95 |  |  |  | 2.3 |  |  | $ | 2,444 |
Six Months Ended June 30, 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at January 1, 2024 |  |  | 165,800 |  |  | $ | 24.35 |  |  |  | 2.9 |  |  | $ | 7,211 |
Exercised |  |  | (23,050 | ) |  |  | 16.20 |  |  |  | 0.7 |  |  |  | 6,261 |
Outstanding at June 30, 2024 |  |  | 142,750 |  |  | $ | 25.67 |  |  |  | 2.6 |  |  | $ | 5,507 |
Exercisable at June 30, 2024 |  |  | 127,250 |  |  | $ | 23.54 |  |  |  | 2.0 |  |  | $ | 5,014 |
Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block] |
|  | Restricted Stock |  |  | Performance Shares |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Shares |  |  | Weighted Average Grant Date Fair Value |
Six Months Ended June 30, 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested at January 1, 2025 |  |  | 145,837 |  |  | $ | 66.35 |  |  |  | 30,065 |  |  | $ | 70.45 |
Granted |  |  | 31,756 |  |  |  | 84.82 |  |  |  | 6,316 |  |  |  | 84.64 |
Additional performance share attainment |  |  | - |  |  |  | - |  |  |  | 290 |  |  |  | 89.68 |
Vested |  |  | (34,299 | ) |  |  | 61.51 |  |  |  | (5,813 | ) |  |  | 75.28 |
Forfeited |  |  | (1,266 | ) |  |  | 79.02 |  |  |  | (1,295 | ) |  |  | 57.52 |
Non-vested at June 30, 2025 |  |  | 142,028 |  |  | $ | 71.54 |  |  |  | 29,563 |  |  | $ | 73.29 |
Six Months Ended June 30, 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested at January 1, 2024 |  |  | 158,298 |  |  | $ | 58.08 |  |  |  | 31,944 |  |  | $ | 58.25 |
Granted |  |  | 27,361 |  |  |  | 66.72 |  |  |  | 8,894 |  |  |  | 67.90 |
Vested |  |  | (45,619 | ) |  |  | 45.49 |  |  |  | (18,653 | ) |  |  | 37.05 |
Forfeited |  |  | (3,989 | ) |  |  | 71.34 |  |  |  | (2,318 | ) |  |  | 72.18 |
Non-vested at June 30, 2024 |  |  | 136,051 |  |  | $ | 63.65 |  |  |  | 19,867 |  |  | $ | 80.85 |

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