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Note 3 - Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | 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 |
Corporate Notes |  |  | 37,046 |  |  |  | — |  |  |  | (2,189 | ) |  |  | 34,857 |
Mortgage-backed Agency securities |  |  | 96,480 |  |  |  | 3 |  |  |  | (13,049 | ) |  |  | 83,434 |
Total |  | $ | 320,123 |  |  | $ | 24 |  |  | $ | (19,798 | ) |  | $ | 300,349 |
|  | December 31, 2021 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 469 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 466 |
Municipal securities |  |  | 28,596 |  |  |  | 198 |  |  |  | — |  |  |  | 28,794 |
Mortgage-backed Agency securities |  |  | 9,935 |  |  |  | — |  |  |  | (16 | ) |  |  | 9,919 |
Total |  |  | 37,273 |  |  |  | 513 |  |  |  | (673 | ) |  |  | 37,113 |
|  | $ | 76,273 |  |  | $ | 711 |  |  | $ | (692 | ) |  | $ | 76,292 |
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 |  | $ | 1,500 |  |  | $ | 32,013 |  |  | $ | 3,070 |  |  | $ | 8,510 |  |  | $ | 45,093 |
After one year through five years |  |  | — |  |  |  | 129,604 |  |  |  | 17,626 |  |  |  | 28,536 |  |  |  | 175,766 |
After five years through ten years |  |  | — |  |  |  | — |  |  |  | 2,784 |  |  |  | — |  |  |  | 2,784 |
After ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortized cost |  | $ | 1,500 |  |  | $ | 161,617 |  |  | $ | 23,480 |  |  | $ | 37,046 |  |  |  | 223,643 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,480 |
Total amortized cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 320,123 |
Fair value maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | 1,485 |  |  | $ | 31,786 |  |  | $ | 3,068 |  |  | $ | 8,448 |  |  | $ | 44,787 |
After one year through five years |  |  | — |  |  |  | 125,478 |  |  |  | 17,467 |  |  |  | 26,409 |  |  |  | 169,354 |
After five years through ten years |  |  | — |  |  |  | — |  |  |  | 2,774 |  |  |  | — |  |  |  | 2,774 |
After ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Fair value |  | $ | 1,485 |  |  | $ | 157,264 |  |  | $ | 23,309 |  |  | $ | 34,857 |  |  |  | 216,915 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83,434 |
Total fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 300,349 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | 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 | )
|  | December 31, 2021 |
|  | 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 |  | $ | — |  |  | $ | — |  |  | $ | 459 |  |  | $ | (3 | ) |  | $ | 459 |  |  | $ | (3 | )
Municipal securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate Notes |  |  | 9,919 |  |  |  | (16 | ) |  |  | — |  |  |  | — |  |  |  | 9,919 |  |  |  | (16 | )
Mortgage-backed Agency securities |  |  | 14,092 |  |  |  | (253 | ) |  |  | 8,384 |  |  |  | (420 | ) |  |  | 22,476 |  |  |  | (673 | )
Total |  | $ | 24,011 |  |  | $ | (269 | ) |  | $ | 8,843 |  |  | $ | (423 | ) |  | $ | 32,854 |  |  | $ | (692 | )

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