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Note 3 - Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposits |  | $ | 29,513 |  |  | $ | — |  |  | $ | — |  |  | $ | 29,513 |
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 |
|  | $ | 186,263 |  |  | $ | 46 |  |  | $ | (3,593 | ) |  | $ | 182,716 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposits |  | $ | 2,233 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,233 |
Municipal securities |  |  | 240 |  |  |  | — |  |  |  | (15 | ) |  |  | 225 |
U.S. Treasury Notes |  |  | 170,906 |  |  |  | — |  |  |  | (7,803 | ) |  |  | 163,103 |
U.S. government-sponsored agencies |  |  | 40,000 |  |  |  | — |  |  |  | (301 | ) |  |  | 39,699 |
Mortgage-backed securities - residential |  |  | 3,997 |  |  |  | 27 |  |  |  | (143 | ) |  |  | 3,881 |
Collateralized mortgage obligations - residential |  |  | 1,223 |  |  |  | — |  |  |  | (26 | ) |  |  | 1,197 |
|  | $ | 218,599 |  |  | $ | 27 |  |  | $ | (8,288 | ) |  | $ | 210,338 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | December 31, 2023 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 119,194 |  |  | $ | 117,892 |
Due after one year through five years |  |  | 62,615 |  |  |  | 60,454 |
|  |  | 181,809 |  |  |  | 178,346 |
Mortgage-backed securities - residential |  |  | 3,431 |  |  |  | 3,367 |
Collateralized mortgage obligations - residential |  |  | 1,023 |  |  |  | 1,003 |
|  | $ | 186,263 |  |  | $ | 182,716 |
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, 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 | )
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  |  | 1 |  |  | $ | 225 |  |  | $ | (15 | ) |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 1 |  |  | $ | 225 |  |  | $ | (15 | )
U.S. Treasury Notes |  |  | 147 |  |  |  | 104,439 |  |  |  | (4,104 | ) |  |  | 53 |  |  |  | 58,664 |  |  |  | (3,699 | ) |  |  | 200 |  |  |  | 163,103 |  |  |  | (7,803 | )
U.S. government-sponsored agencies |  |  | 9 |  |  |  | 39,699 |  |  |  | (301 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9 |  |  |  | 39,699 |  |  |  | (301 | )
Mortgage-backed securities - residential |  |  | 18 |  |  |  | 3,016 |  |  |  | (143 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 18 |  |  |  | 3,016 |  |  |  | (143 | )
Collateralized mortgage obligations - residential |  |  | 5 |  |  |  | 1,009 |  |  |  | (18 | ) |  |  | 1 |  |  |  | 171 |  |  |  | (8 | ) |  |  | 6 |  |  |  | 1,180 |  |  |  | (26 | )
|  |  | 180 |  |  | $ | 148,388 |  |  | $ | (4,581 | ) |  |  | 54 |  |  | $ | 58,835 |  |  | $ | (3,707 | ) |  |  | 234 |  |  | $ | 207,223 |  |  | $ | (8,288 | )
Gain (Loss) on Securities [Table Text Block] |
|  | For the years ended December 31, |
|  | 2023 |  |  | 2022 |
Proceeds |  | $ | 42,631 |  |  | $ | — |
Gross gains |  |  | — |  |  |  | — |
Gross losses |  |  | (454 | ) |  |  | — |

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