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Note 3 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available-for-Sale Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 929 |  |  | $ | — |  |  | $ | (4 | ) |  | $ | 925 |
U.S. Treasury Notes |  |  | 77,128 |  |  |  | — |  |  |  | (2,069 | ) |  |  | 75,059 |
U.S. government-sponsored agencies |  |  | 142,987 |  |  |  | 3 |  |  |  | (174 | ) |  |  | 142,816 |
Mortgage-backed securities - residential |  |  | 3,255 |  |  |  | 27 |  |  |  | (98 | ) |  |  | 3,184 |
Collateralized mortgage obligations - residential |  |  | 938 |  |  |  | — |  |  |  | (16 | ) |  |  | 922 |
|  | $ | 225,237 |  |  | $ | 30 |  |  | $ | (2,361 | ) |  | $ | 222,906 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 930 |  |  | $ | 12 |  |  | $ | (8 | ) |  | $ | 934 |
U.S. Treasury Notes |  |  | 115,920 |  |  |  | — |  |  |  | (3,412 | ) |  |  | 112,508 |
U.S. government-sponsored agencies |  |  | 35,446 |  |  |  | 7 |  |  |  | (62 | ) |  |  | 35,391 |
Mortgage-backed securities - residential |  |  | 3,431 |  |  |  | 27 |  |  |  | (91 | ) |  |  | 3,367 |
Collateralized mortgage obligations - residential |  |  | 1,023 |  |  |  | — |  |  |  | (20 | ) |  |  | 1,003 |
|  | $ | 156,750 |  |  | $ | 46 |  |  | $ | (3,593 | ) |  | $ | 153,203 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 30, 2024 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 104,022 |  |  | $ | 102,671 |
Due after one year through five years |  |  | 117,022 |  |  |  | 116,129 |
|  |  | 221,044 |  |  |  | 218,800 |
Mortgage-backed securities - residential |  |  | 3,255 |  |  |  | 3,184 |
Collateralized mortgage obligations - residential |  |  | 938 |  |  |  | 922 |
|  | $ | 225,237 |  |  | $ | 222,906 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Count |  |  | Fair Value |  |  | Unrealized Loss |  |  | Count |  |  | Fair Value |  |  | Unrealized Loss |  |  | Count |  |  | Fair Value |  |  | Unrealized Loss |
June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  |  | 1 |  |  | $ | 603 |  |  | $ | (1 | ) |  |  | 1 |  |  | $ | 221 |  |  | $ | (3 | ) |  |  | 2 |  |  | $ | 824 |  |  | $ | (4 | )
U.S. Treasury Notes |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 115 |  |  |  | 75,059 |  |  |  | (2,069 | ) |  |  | 115 |  |  |  | 75,059 |  |  |  | (2,069 | )
U.S. government-sponsored agencies |  |  | 15 |  |  |  | 124,837 |  |  |  | (159 | ) |  |  | 2 |  |  |  | 7,985 |  |  |  | (15 | ) |  |  | 17 |  |  |  | 132,822 |  |  |  | (174 | )
Mortgage-backed securities - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12 |  |  |  | 2,236 |  |  |  | (98 | ) |  |  | 12 |  |  |  | 2,236 |  |  |  | (98 | )
Collateralized mortgage obligations - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 922 |  |  |  | (16 | ) |  |  | 5 |  |  |  | 922 |  |  |  | (16 | )
|  |  | 16 |  |  | $ | 125,440 |  |  | $ | (160 | ) |  |  | 135 |  |  | $ | 86,423 |  |  | $ | (2,201 | ) |  |  | 151 |  |  | $ | 211,863 |  |  | $ | (2,361 | )
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 1 |  |  | $ | 217 |  |  | $ | (8 | ) |  |  | 1 |  |  | $ | 217 |  |  | $ | (8 | )
U.S. Treasury Notes |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 170 |  |  |  | 112,508 |  |  |  | (3,412 | ) |  |  | 170 |  |  |  | 112,508 |  |  |  | (3,412 | )
U.S. government-sponsored agencies |  |  | 2 |  |  |  | 8,987 |  |  |  | (13 | ) |  |  | 4 |  |  |  | 17,951 |  |  |  | (49 | ) |  |  | 6 |  |  |  | 26,938 |  |  |  | (62 | )
Mortgage-backed securities - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | 2,627 |  |  |  | (91 | ) |  |  | 17 |  |  |  | 2,627 |  |  |  | (91 | )
Collateralized mortgage obligations - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6 |  |  |  | 1,003 |  |  |  | (20 | ) |  |  | 6 |  |  |  | 1,003 |  |  |  | (20 | )
|  |  | 2 |  |  | $ | 8,987 |  |  | $ | (13 | ) |  |  | 198 |  |  | $ | 134,306 |  |  | $ | (3,580 | ) |  |  | 200 |  |  | $ | 143,293 |  |  | $ | (3,593 | )
Gain (Loss) on Securities [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Proceeds |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 42,631 |
Gross gains |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Gross losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (454 | )

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