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Note 2 - Securities Available for Sale - Gross Unrealized Losses and Fair Value of Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair value, less than 12 months | $ 5,469 | $ 41,496
Unrealized loss, less than 12 months | 44 | 673
Fair value, 12 months or longer | 122,812 | 129,014
Unrealized loss, 12 months or longer | 18,436 | 23,868
Total fair value | 128,281 | 170,510
Total unrealized loss | 18,480 | 24,541
Collateralized Mortgage-Backed Securities [Member] |  |
Fair value, less than 12 months | 0 | 346
Unrealized loss, less than 12 months | 0 | 9
Fair value, 12 months or longer | 8,720 | 9,193
Unrealized loss, 12 months or longer | 1,302 | 1,665
Total fair value | 8,720 | 9,539
Total unrealized loss | 1,302 | 1,674
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Fair value, less than 12 months | 1,589 | 21,145
Unrealized loss, less than 12 months | 12 | 330
Fair value, 12 months or longer | 93,614 | 95,587
Unrealized loss, 12 months or longer | 14,631 | 19,211
Total fair value | 95,203 | 116,732
Total unrealized loss | 14,643 | 19,541
US Government-sponsored Enterprises Debt Securities [Member] |  |
Fair value, less than 12 months | 0 | 0
Unrealized loss, less than 12 months | 0 | 0
Fair value, 12 months or longer | 4,822 | 5,445
Unrealized loss, 12 months or longer | 541 | 722
Total fair value | 4,822 | 5,445
Total unrealized loss | 541 | 722
US States and Political Subdivisions Debt Securities [Member] |  |
Fair value, less than 12 months | 3,880 | 20,005
Unrealized loss, less than 12 months | 32 | 334
Fair value, 12 months or longer | 6,856 | 5,063
Unrealized loss, 12 months or longer | 762 | 996
Total fair value | 10,736 | 25,068
Total unrealized loss | 794 | 1,330
Mortgage-Backed Securities, Issued by Private Enterprises [Member] |  |
Fair value, less than 12 months |  | 0
Unrealized loss, less than 12 months |  | 0
Fair value, 12 months or longer |  | 2,440
Unrealized loss, 12 months or longer |  | 60
Total fair value |  | 2,440
Total unrealized loss |  | 60
Other Debt Obligations [Member] |  |
Fair value, less than 12 months | 0 | 0
Unrealized loss, less than 12 months | 0 | 0
Fair value, 12 months or longer | 8,800 | 11,286
Unrealized loss, 12 months or longer | 1,200 | 1,214
Total fair value | 8,800 | 11,286
Total unrealized loss | $ 1,200 | $ 1,214

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