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Note 3 - Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
Available-for-Sale Securities |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 703 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 706 |
U.S. Treasury Bills and Notes |  |  | 246,876 |  |  |  | 103 |  |  |  | (689 | ) |  |  | 246,290 |
U.S. government-sponsored agencies |  |  | 109,900 |  |  |  | 1 |  |  |  | (128 | ) |  |  | 109,773 |
Mortgage-backed securities - residential |  |  | 2,949 |  |  |  | 31 |  |  |  | (69 | ) |  |  | 2,911 |
Collateralized mortgage obligations - residential |  |  | 862 |  |  |  | — |  |  |  | (12 | ) |  |  | 850 |
|  | $ | 361,290 |  |  | $ | 138 |  |  | $ | (898 | ) |  | $ | 360,530 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 930 |  |  | $ | 12 |  |  | $ | (8 | ) |  | $ | 934 |
U.S. Treasury Bills and 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] |
|  | December 31, 2024 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 292,504 |  |  | $ | 292,073 |
Due after one year through five years |  |  | 64,975 |  |  |  | 64,696 |
|  |  | 357,479 |  |  |  | 356,769 |
Mortgage-backed securities - residential |  |  | 2,949 |  |  |  | 2,911 |
Collateralized mortgage obligations - residential |  |  | 862 |  |  |  | 850 |
|  | $ | 361,290 |  |  | $ | 360,530 |
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 |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Bills and Notes |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 73 |  |  | $ | 48,609 |  |  | $ | (689 | ) |  |  | 73 |  |  | $ | 48,609 |  |  | $ | (689 | )
U.S. government-sponsored agencies |  |  | 10 |  |  |  | 79,872 |  |  |  | (128 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10 |  |  |  | 79,872 |  |  |  | (128 | )
Mortgage-backed securities - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7 |  |  |  | 1,364 |  |  |  | (69 | ) |  |  | 7 |  |  |  | 1,364 |  |  |  | (69 | )
Collateralized mortgage obligations - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 850 |  |  |  | (12 | ) |  |  | 5 |  |  |  | 850 |  |  |  | (12 | )
|  |  | 10 |  |  | $ | 79,872 |  |  | $ | (128 | ) |  |  | 85 |  |  | $ | 50,823 |  |  | $ | (770 | ) |  |  | 95 |  |  | $ | 130,695 |  |  | $ | (898 | )
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 1 |  |  | $ | 217 |  |  | $ | (8 | ) |  |  | 1 |  |  | $ | 217 |  |  | $ | (8 | )
U.S. Treasury Bills and 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] |
|  | For the years ended December 31, |
|  | 2024 |  |  | 2023 |
Proceeds |  | $ | — |  |  | $ | 42,631 |
Gross gains |  |  | — |  |  |  | — |
Gross losses |  |  | — |  |  |  | (454 | )

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