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Note 3 - Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | 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 |
Total |  | $ | 295,045 |  |  | $ | 29 |  |  | $ | (14,113 | ) |  | $ | 280,961 |
|  | December 31, 2022 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 1,500 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 1,485 |
U.S. Treasury securities |  |  | 161,617 |  |  |  | — |  |  |  | (4,353 | ) |  |  | 157,264 |
Municipal securities |  |  | 23,480 |  |  |  | 21 |  |  |  | (192 | ) |  |  | 23,309 |
Mortgage-backed Agency securities |  |  | 37,046 |  |  |  | — |  |  |  | (2,189 | ) |  |  | 34,857 |
Total |  |  | 96,480 |  |  |  | 3 |  |  |  | (13,049 | ) |  |  | 83,434 |
|  | $ | 320,123 |  |  | $ | 24 |  |  | $ | (19,798 | ) |  | $ | 300,349 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
(Amounts in thousands) |  | U.S. Agency Securities |  |  | U.S. Treasury Securities |  |  | Municipal Securities |  |  | Corporate Notes |  |  | Total |
Amortized cost maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | 5,750 |  |  | $ | 146,653 |  |  | $ | 5,118 |  |  | $ | — |  |  | $ | 157,521 |
After one year through five years |  |  | — |  |  |  | — |  |  |  | 14,410 |  |  |  | 28,566 |  |  |  | 42,976 |
After five years through ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
After ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortized cost |  | $ | 5,750 |  |  | $ | 146,653 |  |  | $ | 19,528 |  |  | $ | 28,566 |  |  |  | 200,497 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,548 |
Total amortized cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 295,045 |
Fair value maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | 5,749 |  |  | $ | 145,826 |  |  | $ | 5,116 |  |  | $ | — |  |  | $ | 156,691 |
After one year through five years |  |  | — |  |  |  | — |  |  |  | 14,261 |  |  |  | 27,081 |  |  |  | 41,342 |
After five years through ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
After ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Fair value |  | $ | 5,749 |  |  | $ | 145,826 |  |  | $ | 19,377 |  |  | $ | 27,081 |  |  |  | 198,033 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,928 |
Total fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 280,961 |
Gain (Loss) on Securities [Table Text Block] |
|  | 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 | )
|  | December 31, 2022 |
|  | 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 |  | $ | 1,485 |  |  | $ | (15 | ) |  | $ | — |  |  | $ | — |  |  | $ | 1,485 |  |  | $ | (15 | )
U.S. Treasury securities |  |  | 157,264 |  |  |  | (4,353 | ) |  |  | — |  |  |  | — |  |  |  | 157,264 |  |  |  | (4,353 | )
Municipal securities |  |  | 12,347 |  |  |  | (192 | ) |  |  | — |  |  |  | — |  |  |  | 12,347 |  |  |  | (192 | )
Corporate Notes |  |  | 32,368 |  |  |  | (2,172 | ) |  |  | 2,489 |  |  |  | (17 | ) |  |  | 34,857 |  |  |  | (2,189 | )
Mortgage-backed Agency securities |  |  | 64,993 |  |  |  | (8,824 | ) |  |  | 18,305 |  |  |  | (4,225 | ) |  |  | 83,298 |  |  |  | (13,049 | )
Total |  | $ | 268,457 |  |  | $ | (15,556 | ) |  | $ | 20,794 |  |  | $ | (4,242 | ) |  | $ | 289,251 |  |  | $ | (19,798 | )

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