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Note 5 - Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
2025: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 156,916 |  |  | $ | 363 |  |  | $ | (4,410 | ) |  | $ | 152,869 |
U.S. government agencies |  |  | 92,688 |  |  |  | 117 |  |  |  | (2,872 | ) |  |  | 89,933 |
U.S. government mortgage-backed securities |  |  | 118,927 |  |  |  | 191 |  |  |  | (8,636 | ) |  |  | 110,482 |
State and political subdivisions |  |  | 247,081 |  |  |  | 258 |  |  |  | (11,054 | ) |  |  | 236,285 |
Corporate bonds |  |  | 63,606 |  |  |  | 114 |  |  |  | (2,629 | ) |  |  | 61,091 |
|  | $ | 679,218 |  |  | $ | 1,043 |  |  | $ | (29,601 | ) |  | $ | 650,660 |
2024: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 176,483 |  |  | $ | 8 |  |  | $ | (8,776 | ) |  | $ | 167,715 |
U.S. government agencies |  |  | 88,625 |  |  |  | 2 |  |  |  | (5,194 | ) |  |  | 83,433 |
U.S. government mortgage-backed securities |  |  | 103,964 |  |  |  | 6 |  |  |  | (12,920 | ) |  |  | 91,050 |
State and political subdivisions |  |  | 266,118 |  |  |  | 35 |  |  |  | (20,591 | ) |  |  | 245,562 |
Corporate bonds |  |  | 65,338 |  |  |  | 7 |  |  |  | (4,592 | ) |  |  | 60,753 |
|  | $ | 700,528 |  |  | $ | 58 |  |  | $ | (52,073 | ) |  | $ | 648,513 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 92,716 |  |  | $ | 91,586 |
Due after one year through five years |  |  | 370,875 |  |  |  | 357,222 |
Due after five years through ten years |  |  | 94,597 |  |  |  | 89,267 |
Due after ten years |  |  | 2,103 |  |  |  | 2,103 |
|  | $ | 560,291 |  |  | $ | 540,178 |
U.S. government mortgage-backed securities |  |  | 118,927 |  |  |  | 110,482 |
Total |  | $ | 679,218 |  |  | $ | 650,660 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Proceeds from sales of securities available-for-sale |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 2,049 |
Gross realized gains on securities available-for-sale |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Gross realized losses on securities available-for-sale |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (165 | )
Gain (Loss) on Securities [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |
2025: |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 117,197 |  |  | $ | (4,410 | ) |  |  | 68 |  |  | $ | 117,197 |  |  | $ | (4,410 | )
U.S. government agencies |  |  | 13,331 |  |  |  | (90 | ) |  |  | 8 |  |  |  | 65,022 |  |  |  | (2,782 | ) |  |  | 56 |  |  |  | 78,353 |  |  |  | (2,872 | )
U.S. government mortgage-backed securities |  |  | 10,919 |  |  |  | (59 | ) |  |  | 9 |  |  |  | 79,653 |  |  |  | (8,577 | ) |  |  | 147 |  |  |  | 90,572 |  |  |  | (8,636 | )
State and political subdivisions |  |  | 2,274 |  |  |  | (117 | ) |  |  | 6 |  |  |  | 204,049 |  |  |  | (10,937 | ) |  |  | 389 |  |  |  | 206,323 |  |  |  | (11,054 | )
Corporate bonds |  |  | 1,500 |  |  |  | (7 | ) |  |  | 2 |  |  |  | 52,036 |  |  |  | (2,622 | ) |  |  | 63 |  |  |  | 53,536 |  |  |  | (2,629 | )
|  | $ | 28,024 |  |  | $ | (273 | ) |  |  | 25 |  |  | $ | 517,957 |  |  | $ | (29,328 | ) |  |  | 723 |  |  | $ | 545,981 |  |  | $ | (29,601 | )
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |  |  | No. of |  |  | Estimated |  |  | Unrealized |
2024: |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |  |  | Securities |  |  | Fair Value |  |  | Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 5,466 |  |  | $ | (43 | ) |  |  | 2 |  |  | $ | 159,321 |  |  | $ | (8,733 | ) |  |  | 94 |  |  | $ | 164,787 |  |  | $ | (8,776 | )
U.S. government agencies |  |  | 3,953 |  |  |  | (34 | ) |  |  | 2 |  |  |  | 77,166 |  |  |  | (5,160 | ) |  |  | 70 |  |  |  | 81,119 |  |  |  | (5,194 | )
U.S. government mortgage-backed securities |  |  | 3,740 |  |  |  | (64 | ) |  |  | 5 |  |  |  | 86,870 |  |  |  | (12,856 | ) |  |  | 154 |  |  |  | 90,610 |  |  |  | (12,920 | )
State and political subdivisions |  |  | 13,944 |  |  |  | (253 | ) |  |  | 25 |  |  |  | 226,201 |  |  |  | (20,338 | ) |  |  | 440 |  |  |  | 240,145 |  |  |  | (20,591 | )
Corporate bonds |  |  | 3,153 |  |  |  | (27 | ) |  |  | 4 |  |  |  | 56,604 |  |  |  | (4,565 | ) |  |  | 74 |  |  |  | 59,757 |  |  |  | (4,592 | )
|  | $ | 30,256 |  |  | $ | (421 | ) |  |  | 38 |  |  | $ | 606,162 |  |  | $ | (51,652 | ) |  |  | 832 |  |  | $ | 636,418 |  |  | $ | (52,073 | )

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