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Note 6 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | $ 790,449 | $ 729,030 | $ 501,658 | $ 471,252 | $ 729,030 | $ 471,252
Other comprehensive income (loss) | 3,009 | 10,203 | (1,550) | (2,514) |  |
Balance | 847,197 | 790,449 | 532,606 | 501,658 | 847,197 | 532,606
AOCI Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | (16,642) | (26,845) | (26,505) | (23,991) | (26,845) | (23,991)
Other comprehensive income (loss) before reclassification |  |  |  |  | 16,389 | (5,129)
Federal income tax (benefit) expense |  |  |  |  | (3,432) | 1,078
Other comprehensive income (loss) before reclassification, net of tax |  |  |  |  | 12,957 | (4,051)
Amounts reclassified from AOCI |  |  |  |  | 323 | (16)
Federal income tax (benefit) expense |  |  |  |  | (68) | 3
Amounts reclassified from AOCI, net of tax |  |  |  |  | 255 | (13)
Other comprehensive income (loss) | 3,009 | 10,203 | (1,550) | (2,514) | 13,212 | (4,064)
Balance | $ (13,633) | $ (16,642) | $ (28,055) | $ (26,505) | $ (13,633) | $ (28,055)

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