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Note 3 - Investment Securities | 3 Months Ended
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Mar. 31, 2025
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | NOTE 3 - INVESTMENT SECURITIES Our short-term investments as of March 31, 2025 and December 31, 2024 are classified as held-to-maturity. Held-to-maturity investments are recorded at amortized cost. The following tables summarize our short-term investment securities at March 31, 2025 and December 31, 2024:
​ |  | 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 |
Our long-term investments as of March 31, 2025 include shares of common stock of Precision. The fair market value of the equity securities as of March 31, 2025 was $1.5 million. For the three months ended March 31, 2025, we recorded an unrealized gain of $0.3 million to other income, based on the change in fair value of Precision’s common stock during the period. See Note 5 - Fair Value Measurements for further details.

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