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Note 3 - Securities (Tables) | 9 Months Ended
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Sep. 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 928 |  |  | $ | 10 |  |  | $ | (1 | ) |  | $ | 937 |
U.S. Treasury Notes |  |  | 123,307 |  |  |  | 24 |  |  |  | (1,065 | ) |  |  | 122,266 |
U.S. government-sponsored agencies |  |  | 137,898 |  |  |  | 56 |  |  |  | (129 | ) |  |  | 137,825 |
Mortgage-backed securities - residential |  |  | 3,011 |  |  |  | 30 |  |  |  | (52 | ) |  |  | 2,989 |
Collateralized mortgage obligations - residential |  |  | 899 |  |  |  | — |  |  |  | (11 | ) |  |  | 888 |
|  | $ | 266,043 |  |  | $ | 120 |  |  | $ | (1,258 | ) |  | $ | 264,905 |
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] |
|  | September 30, 2024 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 135,578 |  |  | $ | 134,776 |
Due after one year through five years |  |  | 126,555 |  |  |  | 126,252 |
|  |  | 262,133 |  |  |  | 261,028 |
Mortgage-backed securities - residential |  |  | 3,011 |  |  |  | 2,989 |
Collateralized mortgage obligations - residential |  |  | 899 |  |  |  | 888 |
|  | $ | 266,043 |  |  | $ | 264,905 |
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 |
September 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 1 |  |  | $ | 224 |  |  | $ | (1 | ) |  |  | 1 |  |  | $ | 224 |  |  | $ | (1 | )
U.S. Treasury Notes |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 84 |  |  |  | 62,656 |  |  |  | (1,065 | ) |  |  | 84 |  |  |  | 62,656 |  |  |  | (1,065 | )
U.S. government-sponsored agencies |  |  | 8 |  |  |  | 69,871 |  |  |  | (129 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 8 |  |  |  | 69,871 |  |  |  | (129 | )
Mortgage-backed securities - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7 |  |  |  | 1,398 |  |  |  | (52 | ) |  |  | 7 |  |  |  | 1,398 |  |  |  | (52 | )
Collateralized mortgage obligations - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 888 |  |  |  | (11 | ) |  |  | 5 |  |  |  | 888 |  |  |  | (11 | )
|  |  | 8 |  |  | $ | 69,871 |  |  | $ | (129 | ) |  |  | 97 |  |  | $ | 65,166 |  |  | $ | (1,129 | ) |  |  | 105 |  |  | $ | 135,037 |  |  | $ | (1,258 | )
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 |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Proceeds |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 42,631 |
Gross gains |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Gross losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (454 | )

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