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Note 3 - Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | December 31, 2024 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 55,760 |  |  | $ | 10 |  |  | $ | (1 | ) |  | $ | 55,769 |
Municipal securities |  |  | 13,949 |  |  |  | 2 |  |  |  | (114 | ) |  |  | 13,837 |
Corporate Notes |  |  | 28,598 |  |  |  | — |  |  |  | (1,056 | ) |  |  | 27,542 |
Mortgage-backed Agency securities |  |  | 86,380 |  |  |  | — |  |  |  | (13,679 | ) |  |  | 72,701 |
Total |  | $ | 184,687 |  |  | $ | 12 |  |  | $ | (14,850 | ) |  | $ | 169,849 |
|  | December 31, 2023 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 5,750 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 5,749 |
U.S. Treasury securities |  |  | 146,653 |  |  |  | 16 |  |  |  | (843 | ) |  |  | 145,826 |
Municipal securities |  |  | 19,528 |  |  |  | 11 |  |  |  | (162 | ) |  |  | 19,377 |
Corporate Notes |  |  | 28,566 |  |  |  | — |  |  |  | (1,485 | ) |  |  | 27,081 |
Mortgage-backed Agency securities |  |  | 94,548 |  |  |  | 2 |  |  |  | (11,622 | ) |  |  | 82,928 |
|  | $ | 295,045 |  |  | $ | 29 |  |  | $ | (14,113 | ) |  | $ | 280,961 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
(Amounts in thousands) |  | U.S. Treasury Securities |  |  | Municipal Securities |  |  | Corporate Notes |  |  | Total |
Amortized cost maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | 55,760 |  |  | $ | 4,074 |  |  | $ | 3,761 |  |  | $ | 63,595 |
After one year through five years |  |  | — |  |  |  | 9,875 |  |  |  | 24,837 |  |  |  | 34,712 |
After five years through ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
After ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortized cost |  | $ | 55,760 |  |  | $ | 13,949 |  |  | $ | 28,598 |  |  |  | 98,307 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86,380 |
Total amortized cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 184,687 |
Fair value maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | 55,769 |  |  | $ | 4,073 |  |  | $ | 3,719 |  |  | $ | 63,561 |
After one year through five years |  |  | — |  |  |  | 9,764 |  |  |  | 23,823 |  |  |  | 33,587 |
After five years through ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
After ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Fair value |  | $ | 55,769 |  |  | $ | 13,837 |  |  | $ | 27,542 |  |  |  | 97,148 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72,701 |
Total fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 169,849 |
Gain (Loss) on Securities [Table Text Block] |
|  | December 31, 2024 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 4,984 |  |  | $ | (1 | ) |  | $ | - |  |  | $ | - |  |  | $ | 4,984 |  |  | $ | (1 | )
Municipal securities |  |  | 3,914 |  |  |  | (16 | ) |  |  | 6,638 |  |  |  | (98 | ) |  |  | 10,552 |  |  |  | (114 | )
Corporate Notes |  |  | — |  |  |  | — |  |  |  | 27,542 |  |  |  | (1,056 | ) |  |  | 27,542 |  |  |  | (1,056 | )
Mortgage-backed Agency securities |  |  | 4,100 |  |  |  | (81 | ) |  |  | 68,601 |  |  |  | (13,598 | ) |  |  | 72,701 |  |  |  | (13,679 | )
Total |  | $ | 12,998 |  |  | $ | (98 | ) |  | $ | 102,781 |  |  | $ | (14,752 | ) |  | $ | 115,779 |  |  | $ | (14,850 | )
|  | December 31, 2023 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 5,749 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 5,749 |  |  | $ | (1 | )
U.S. Treasury securities |  |  | 11,417 |  |  |  | (14 | ) |  |  | 129,108 |  |  |  | (829 | ) |  |  | 140,525 |  |  |  | (843 | )
Municipal securities |  |  | 4,742 |  |  |  | (20 | ) |  |  | 5,484 |  |  |  | (142 | ) |  |  | 10,226 |  |  |  | (162 | )
Corporate Notes |  |  | — |  |  |  | — |  |  |  | 27,081 |  |  |  | (1,485 | ) |  |  | 27,081 |  |  |  | (1,485 | )
Mortgage-backed Agency securities |  |  | 3,421 |  |  |  | (10 | ) |  |  | 78,319 |  |  |  | (11,612 | ) |  |  | 81,740 |  |  |  | (11,622 | )
Total |  | $ | 25,329 |  |  | $ | (45 | ) |  | $ | 239,992 |  |  | $ | (14,068 | ) |  | $ | 265,321 |  |  | $ | (14,113 | )

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