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Note 2 - Debt Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2022 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
(Amounts in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Agency securities |  | $ | 425 |  |  | $ | - |  |  | $ | (2 | ) |  | $ | 423 |
U.S. Treasury Notes |  |  | 136,419 |  |  |  | - |  |  |  | (2,176 | ) |  |  | 134,243 |
Municipal securities |  |  | 24,461 |  |  |  | 51 |  |  |  | (58 | ) |  |  | 24,454 |
Corporate notes |  |  | 40,625 |  |  |  | - |  |  |  | (1,520 | ) |  |  | 39,105 |
Agency mortgage-backed securities |  |  | 98,265 |  |  |  | 13 |  |  |  | (8,736 | ) |  |  | 89,542 |
Total |  | $ | 300,195 |  |  | $ | 64 |  |  | $ | (12,492 | ) |  | $ | 287,767 |
|  | 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 |
Corporate notes |  |  | 9,935 |  |  |  | — |  |  |  | (16 | ) |  |  | 9,919 |
Agency mortgage-backed securities |  |  | 37,273 |  |  |  | 513 |  |  |  | (673 | ) |  |  | 37,113 |
Total |  | $ | 76,273 |  |  | $ | 711 |  |  | $ | (692 | ) |  | $ | 76,292 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 30, 2022 |
|  | Amortized |  |  |  |  |
(Amounts in thousands) |  | Cost |  |  | Fair Value |
Available-for-sale debt securities |  |  |  |  |  |  |  |
Due within one year |  | $ | 19,637 |  |  | $ | 19,499 |
Due after one year but within five years |  |  | 177,850 |  |  |  | 174,311 |
Due after five years but within ten years |  |  | 4,443 |  |  |  | 4,415 |
|  |  | 201,930 |  |  |  | 198,225 |
Agency mortgage-backed securities |  |  | 98,265 |  |  |  | 89,542 |
Total debt securities available for sale |  | $ | 300,195 |  |  | $ | 287,767 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | June 30, 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 |  | $ | - |  |  | $ | - |  |  | $ | 416 |  |  | $ | (2 | ) |  | $ | 416 |  |  | $ | (2 | )
U.S. Treasury Notes |  |  | 134,243 |  |  |  | (2,176 | ) |  |  | - |  |  |  | - |  |  |  | 134,243 |  |  |  | (2,176 | )
Municipal securities |  |  | 5,178 |  |  |  | (58 | ) |  |  | - |  |  |  | - |  |  |  | 5,178 |  |  |  | (58 | )
Corporate notes |  |  | 38,119 |  |  |  | (1,520 | ) |  |  | - |  |  |  | - |  |  |  | 38,119 |  |  |  | (1,520 | )
Agency mortgage-backed securities |  |  | 76,334 |  |  |  | (6,381 | ) |  |  | 12,009 |  |  |  | (2,355 | ) |  |  | 88,343 |  |  |  | (8,736 | )
Total |  | $ | 253,874 |  |  | $ | (10,135 | ) |  | $ | 12,425 |  |  | $ | (2,357 | ) |  | $ | 266,299 |  |  | $ | (12,492 | )
|  | 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 | )
Corporate notes |  |  | 9,919 |  |  |  | (16 | ) |  |  | — |  |  |  | — |  |  |  | 9,919 |  |  |  | (16 | )
Agency mortgage-backed securities |  |  | 14,092 |  |  |  | (253 | ) |  |  | 8,384 |  |  |  | (420 | ) |  |  | 22,476 |  |  |  | (673 | )
Total |  | $ | 24,011 |  |  | $ | (269 | ) |  | $ | 8,843 |  |  | $ | (423 | ) |  | $ | 32,854 |  |  | $ | (692 | )

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