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Note 3 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
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, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 702 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 706 |
U.S. Treasury Bills and Notes |  |  | 432,879 |  |  |  | 70 |  |  |  | (216 | ) |  |  | 432,733 |
Mortgage-backed securities - residential |  |  | 2,755 |  |  |  | 36 |  |  |  | (55 | ) |  |  | 2,736 |
Collateralized mortgage obligations - residential |  |  | 801 |  |  |  | — |  |  |  | (11 | ) |  |  | 790 |
|  | $ | 437,137 |  |  | $ | 110 |  |  | $ | (282 | ) |  | $ | 436,965 |
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 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 30, 2025 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 419,986 |  |  | $ | 419,890 |
Due after one year through five years |  |  | 13,595 |  |  |  | 13,549 |
|  |  | 433,581 |  |  |  | 433,439 |
Mortgage-backed securities - residential |  |  | 2,755 |  |  |  | 2,736 |
Collateralized mortgage obligations - residential |  |  | 801 |  |  |  | 790 |
|  | $ | 437,137 |  |  | $ | 436,965 |
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, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Bills and Notes |  |  | 22 |  |  | $ | 218,088 |  |  | $ | (41 | ) |  |  | 37 |  |  | $ | 16,292 |  |  | $ | (175 | ) |  |  | 59 |  |  | $ | 234,380 |  |  | $ | (216 | )
Mortgage-backed securities - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 1,146 |  |  |  | (55 | ) |  |  | 5 |  |  |  | 1,146 |  |  |  | (55 | )
Collateralized mortgage obligations - residential |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 790 |  |  |  | (11 | ) |  |  | 5 |  |  |  | 790 |  |  |  | (11 | )
|  |  | 22 |  |  | $ | 218,088 |  |  | $ | (41 | ) |  |  | 47 |  |  | $ | 18,228 |  |  | $ | (241 | ) |  |  | 69 |  |  | $ | 236,316 |  |  | $ | (282 | )
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 | )

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