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Note 3 - Investment 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 |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
September 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury notes |  | $ | 69,717 |  |  |  | — |  |  |  | 4,145 |  |  |  | 65,572 |
U.S. Agency notes |  |  | 88,668 |  |  |  | — |  |  |  | 5,360 |  |  |  | 83,308 |
Corporate bonds |  |  | 7,450 |  |  |  | — |  |  |  | 588 |  |  |  | 6,862 |
U.S. Agency mortgage-backed securities |  |  | 75,422 |  |  |  | 7 |  |  |  | 7,090 |  |  |  | 68,339 |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |
Non-taxable |  |  | 4,596 |  |  |  | — |  |  |  | 222 |  |  |  | 4,374 |
Taxable |  |  | 36,674 |  |  |  | 1 |  |  |  | 2,508 |  |  |  | 34,167 |
|  | $ | 282,527 |  |  |  | 8 |  |  |  | 19,913 |  |  |  | 262,622 |
Debt Securities, Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable |  | $ | 15,454 |  |  |  | 10 |  |  |  | 765 |  |  |  | 14,699 |
Taxable |  |  | 3,283 |  |  |  | — |  |  |  | 300 |  |  |  | 2,983 |
|  | $ | 18,737 |  |  |  | 10 |  |  |  | 1,065 |  |  |  | 17,682 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury notes |  | $ | 74,404 |  |  |  | — |  |  |  | 6,202 |  |  |  | 68,202 |
U.S. Agency notes |  |  | 88,978 |  |  |  | — |  |  |  | 8,077 |  |  |  | 80,901 |
Corporate Bonds |  |  | 7,450 |  |  |  | — |  |  |  | 916 |  |  |  | 6,534 |
U.S. Agency mortgage-backed securities |  |  | 81,634 |  |  |  | 2 |  |  |  | 8,846 |  |  |  | 72,790 |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable |  |  | 7,416 |  |  |  | — |  |  |  | 245 |  |  |  | 7,171 |
Taxable |  |  | 44,923 |  |  |  | 1 |  |  |  | 3,921 |  |  |  | 41,003 |
|  | $ | 304,805 |  |  |  | 3 |  |  |  | 28,207 |  |  |  | 276,601 |
Debt Securities, Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable |  | $ | 13,580 |  |  |  | 4 |  |  |  | 872 |  |  |  | 12,712 |
Taxable |  |  | 3,283 |  |  |  | — |  |  |  | 316 |  |  |  | 2,967 |
|  | $ | 16,863 |  |  |  | 4 |  |  |  | 1,188 |  |  |  | 15,679 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | Less than Twelve Months |  |  | Twelve Months or Greater |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
September 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury notes |  | $ | 1,982 |  |  |  | 6 |  |  |  | 63,590 |  |  |  | 4,139 |
U.S. Agency notes |  |  | — |  |  |  | — |  |  |  | 83,308 |  |  |  | 5,360 |
Corporate bonds |  |  | — |  |  |  | — |  |  |  | 6,862 |  |  |  | 588 |
U.S. Agency mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | 68,025 |  |  |  | 7,090 |
Municipal securities: |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Non-taxable |  |  | — |  |  |  | — |  |  |  | 4,374 |  |  |  | 222 |
Taxable |  |  | — |  |  |  | — |  |  |  | 34,046 |  |  |  | 2,508 |
|  | $ | 1,982 |  |  |  | 6 |  |  |  | 260,205 |  |  |  | 19,907 |
Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable |  | $ | — |  |  |  | — |  |  |  | 11,707 |  |  |  | 765 |
Taxable |  |  | — |  |  |  | — |  |  |  | 2,983 |  |  |  | 300 |
|  | $ | — |  |  |  | — |  |  |  | 14,690 |  |  |  | 1,065 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury notes |  | $ | — |  |  |  | — |  |  |  | 68,202 |  |  |  | 6,202 |
U.S. Agency notes |  |  | — |  |  |  | — |  |  |  | 80,901 |  |  |  | 8,077 |
Corporate Bonds |  |  | 734 |  |  |  | 16 |  |  |  | 5,800 |  |  |  | 900 |
U.S. Agency mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | 72,287 |  |  |  | 8,846 |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable |  |  | 1,540 |  |  |  | 10 |  |  |  | 5,631 |  |  |  | 235 |
Taxable |  |  | — |  |  |  | — |  |  |  | 40,392 |  |  |  | 3,921 |
|  | $ | 2,274 |  |  |  | 26 |  |  |  | 273,213 |  |  |  | 28,181 |
Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable |  | $ | 6,012 |  |  |  | 476 |  |  |  | 5,975 |  |  |  | 396 |
Taxable |  |  | — |  |  |  | — |  |  |  | 2,966 |  |  |  | 316 |
|  | $ | 6,012 |  |  |  | 476 |  |  |  | 8,941 |  |  |  | 712 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Available-for-Sale |  |  | Held-to-Maturity |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Due within one year |  | $ | 25,093 |  |  |  | 24,668 |  |  |  | 1,163 |  |  |  | 1,158 |
Due from one to five years |  |  | 153,392 |  |  |  | 143,285 |  |  |  | 1,301 |  |  |  | 1,278 |
Due from five to ten years |  |  | 28,620 |  |  |  | 26,331 |  |  |  | 10,459 |  |  |  | 9,919 |
Due after ten years |  |  | — |  |  |  | — |  |  |  | 5,814 |  |  |  | 5,327 |
|  |  | 207,105 |  |  |  | 194,284 |  |  |  | 18,737 |  |  |  | 17,682 |
U.S. Agency mortgage-backed securities |  |  | 75,422 |  |  |  | 68,338 |  |  |  | — |  |  |  | — |
|  | $ | 282,527 |  |  |  | 262,622 |  |  |  | 18,737 |  |  |  | 17,682 |
Gain (Loss) on Securities [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Proceeds from sales |  | $ | — |  |  |  | — |  |  |  | 9,615 |  |  |  | — |
Gross realized gains |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Gross realized losses |  |  | — |  |  |  | — |  |  |  | 214 |  |  |  | — |
Marketable Securities [Table Text Block] |
|  | September 30, 2024 |  |  | December 31, 2023 |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Mutual Funds |  | $ | 1,442 |  |  |  | 1,294 |  |  |  | 1,415 |  |  |  | 1,240 |
Equity Securities |  |  | 10 |  |  |  | 94 |  |  |  | 10 |  |  |  | 96 |
Total equity securities with a readily determinable fair value |  | $ | 1,452 |  |  |  | 1,388 |  |  |  | 1,425 |  |  |  | 1,336 |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Net gains (losses) recognized during the period on equity securities |  | $ | 49 |  |  |  | (33 | ) |  |  | 25 |  |  |  | (78 | )
Less net losses recognized during the period on equity securities sold during the period |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (61 | )
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at period end |  | $ | 49 |  |  |  | (33 | ) |  |  | 25 |  |  |  | (17 | )

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