Note 2 - Investment Securities (Tables)
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12 Months Ended |
Dec. 31, 2025 |
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| Notes Tables |
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| Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
| December 31, 2025 | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value |
| Obligations of the U.S. Treasury and U.S. government agencies and corporations | | $ | 18,910 | | | $ | 54 | | | $ | (213 | ) | | $ | 18,751 | |
| Obligations of state and political subdivisions | | | 17,736 | | | | 43 | | | | (1,497 | ) | | | 16,282 | |
| Corporate bonds | | | 25,922 | | | | 95 | | | | (1,335 | ) | | | 24,682 | |
| Residential mortgage-backed securities | | | 282,849 | | | | 716 | | | | (36,186 | ) | | | 247,379 | |
| Commercial mortgage-backed securities | | | 70,585 | | | | 118 | | | | (7,183 | ) | | | 63,520 | |
| Total | | $ | 416,002 | | | $ | 1,026 | | | $ | (46,414 | ) | | $ | 370,614 | |
| December 31, 2024 | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value |
| Obligations of the U.S. Treasury and U.S. government agencies and corporations | | $ | 15,985 | | | $ | 47 | | | $ | (325 | ) | | $ | 15,707 | |
| Obligations of state and political subdivisions | | | 18,363 | | | | — | | | | (2,243 | ) | | | 16,120 | |
| Corporate bonds | | | 29,772 | | | | 8 | | | | (2,513 | ) | | | 27,267 | |
| Residential mortgage-backed securities | | | 256,272 | | | | 39 | | | | (47,543 | ) | | | 208,768 | |
| Commercial mortgage-backed securities | | | 72,172 | | | | 133 | | | | (9,046 | ) | | | 63,259 | |
| Total | | $ | 392,564 | | | $ | 227 | | | $ | (61,670 | ) | | $ | 331,121 | |
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| Debt Securities, Available-for-Sale [Table Text Block] |
| | | Twelve months ended December 31, |
| | | 2025 | | 2024 | | 2023 |
| Proceeds from sales | | $ | — | | | $ | 18,048 | | | $ | 14,974 | |
| Gross gains | | $ | — | | | $ | — | | | $ | 2 | |
| Gross losses | | $ | — | | | $ | (754 | ) | | $ | (325 | ) |
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| Debt Securities, Held-to-Maturity [Table Text Block] |
| December 31, 2025 | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value |
| Obligations of state and political subdivisions | | $ | 46,331 | | | $ | 2,518 | | | $ | (3 | ) | | $ | 48,846 | |
| Residential mortgage-backed securities | | | 1,868 | | | | — | | | | (174 | ) | | | 1,694 | |
| Total | | $ | 48,199 | | | $ | 2,518 | | | $ | (177 | ) | | $ | 50,540 | |
| December 31, 2024 | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value |
| Obligations of state and political subdivisions | | $ | 40,618 | | | $ | 70 | | | $ | (365 | ) | | $ | 40,323 | |
| Residential mortgage-backed securities | | | 2,069 | | | | — | | | | (248 | ) | | | 1,821 | |
| Total | | $ | 42,687 | | | $ | 70 | | | $ | (613 | ) | | $ | 42,144 | |
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| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
| | | Less than 12 Months | | | 12 Months or More | | | Total | |
| December 31, 2025 | | Fair Value | | | Unrealized Losses | | | Fair Value | | | Unrealized Losses | | | Fair Value | | | Unrealized Losses | |
| Obligations of the U.S. Treasury and U.S. government agencies and corporations | | $ | 5,669 | | | $ | (18 | ) | | $ | 3,017 | | | $ | (195 | ) | | $ | 8,686 | | | $ | (213 | ) |
| Obligations of state and political subdivisions | | | — | | | | — | | | | 14,330 | | | | (1,497 | ) | | | 14,330 | | | | (1,497 | ) |
| Corporate bonds | | | 3,169 | | | | (32 | ) | | | 14,196 | | | | (1,303 | ) | | | 17,365 | | | | (1,335 | ) |
| Residential mortgage-backed securities | | | 11,982 | | | | (97 | ) | | | 192,175 | | | | (36,089 | ) | | | 204,157 | | | | (36,186 | ) |
| Commercial mortgage-backed securities | | | 9,865 | | | | (70 | ) | | | 41,810 | | | | (7,113 | ) | | | 51,675 | | | | (7,183 | ) |
| Total | | $ | 30,685 | | | $ | (217 | ) | | $ | 265,528 | | | $ | (46,197 | ) | | $ | 296,213 | | | $ | (46,414 | ) |
| | | Less than 12 Months | | | 12 Months or More | | | Total | |
| December 31, 2024 | | Fair Value | | | Unrealized Losses | | | Fair Value | | | Unrealized Losses | | | Fair Value | | | Unrealized Losses | |
| Obligations of the U.S. Treasury and U.S. government agencies and corporations | | $ | 5,505 | | | $ | (20 | ) | | $ | 4,012 | | | $ | (305 | ) | | $ | 9,517 | | | $ | (325 | ) |
| Obligations of state and political subdivisions | | | 3,434 | | | | (99 | ) | | | 12,686 | | | | (2,144 | ) | | | 16,120 | | | | (2,243 | ) |
| Corporate bonds | | | 1,947 | | | | (5 | ) | | | 24,326 | | | | (2,508 | ) | | | 26,273 | | | | (2,513 | ) |
| Residential mortgage-backed securities | | | 5,432 | | | | (103 | ) | | | 198,803 | | | | (47,440 | ) | | | 204,235 | | | | (47,543 | ) |
| Commercial mortgage-backed securities | | | 9,226 | | | | (134 | ) | | | 42,293 | | | | (8,912 | ) | | | 51,519 | | | | (9,046 | ) |
| Total | | $ | 25,544 | | | $ | (361 | ) | | $ | 282,120 | | | $ | (61,309 | ) | | $ | 307,664 | | | $ | (61,670 | ) |
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| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value [Table Text Block] |
| | | Less than 12 Months | | | 12 Months or More | | | Total | |
| December 31, 2025 | | Fair Value | | | Unrealized Losses | | | Fair Value | | | Unrealized Losses | | | Fair Value | | | Unrealized Losses | |
| Obligations of state and political subdivisions | | $ | — | | | $ | — | | | $ | 2,060 | | | $ | (3 | ) | | $ | 2,060 | | | $ | (3 | ) |
| Residential mortgage-backed securities | | | — | | | | — | | | | 1,694 | | | | (174 | ) | | | 1,694 | | | | (174 | ) |
| Total | | $ | — | | | $ | — | | | $ | 3,754 | | | $ | (177 | ) | | $ | 3,754 | | | $ | (177 | ) |
| | | Less than 12 Months | | | 12 Months or More | | | Total | |
| December 31, 2024 | | Fair Value | | | Unrealized Losses | | | Fair Value | | | Unrealized Losses | | | Fair Value | | | Unrealized Losses | |
| Obligations of state and political subdivisions | | $ | 10,795 | | | $ | (209 | ) | | $ | 2,458 | | | $ | (156 | ) | | $ | 13,253 | | | $ | (365 | ) |
| Residential mortgage-backed securities | | | — | | | | — | | | | 1,821 | | | | (248 | ) | | | 1,821 | | | | (248 | ) |
| Total | | $ | 10,795 | | | $ | (209 | ) | | $ | 4,279 | | | $ | (404 | ) | | $ | 15,074 | | | $ | (613 | ) |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | | Available for Sale | | | Held to Maturity | |
| December 31, 2025 | | Amortized Cost | | | Fair Value | | | Amortized Cost | | | Fair Value | |
| Due within one year | | $ | 5,177 | | | $ | 5,190 | | | $ | — | | | $ | — | |
| Due after one year through five years | | | 25,310 | | | | 24,793 | | | | 2,064 | | | | 2,061 | |
| Due after five years through ten years | | | 30,711 | | | | 29,415 | | | | 7,540 | | | | 7,650 | |
| Due after ten years | | | 354,804 | | | | 311,216 | | | | 38,595 | | | | 40,829 | |
| Total debt securities | | $ | 416,002 | | | $ | 370,614 | | | $ | 48,199 | | | $ | 50,540 | |
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