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v3.25.1

Note 3 - Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Debt Securities, Held-to-Maturity [Table Text Block] |
​ |  | March 31, 2025 |
​ |  | Amortized |  |  | Gross |  |  | Gross |  |  | ​ |
​ |  | cost, as |  |  | unrealized |  |  | unrealized |  |  | Estimated |
(in thousands) |  | adjusted |  |  | holding gains |  |  | holding losses |  |  | fair value |
Short-term investments: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of domestic governmental agencies (maturing between April 2025 and January 2026) (held-to-maturity) |  | $ | 144,101 |  |  | $ | 27 |  |  | $ | (6 | ) |  | $ | 144,122 |
Total short-term investments |  | $ | 144,101 |  |  | $ | 27 |  |  | $ | (6 | ) |  | $ | 144,122 |
​ |  | December 31, 2024 |
​ |  | Amortized |  |  | Gross |  |  | Gross |  |  | ​ |
​ |  | cost, as |  |  | unrealized |  |  | unrealized |  |  | Estimated |
​ |  | adjusted |  |  | holding gains |  |  | holding losses |  |  | fair value |
Short-term investments: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of domestic governmental agencies (maturing between January 2025 and December 2025) (held-to-maturity) |  | $ | 131,106 |  |  | $ | 64 |  |  | $ | — |  |  | $ | 131,170 |
Total short-term investments |  | $ | 131,106 |  |  | $ | 64 |  |  | $ | — |  |  | $ | 131,170 |

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