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Note 4 - Marketable Securities | 6 Months Ended
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Jun. 30, 2026
Notes to Financial Statements |
Investment in Debt and Equity Securities and Other Trading Assets [Text Block] |
4. | Marketable Securities
The available-for-sale marketable securities are primarily comprised of investments in commercial paper, corporate bonds and government securities and consist of the following, measured at fair value on a recurring basis (in thousands):
|  | Fair Value Measurements Using Inputs Considered as of: |
|  | June 30, 2026 |  |  | December 31, 2025 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Government securities |  | $ | 32,063 |  |  | $ | — |  |  | $ | 32,063 |  |  | $ | — |  |  | $ | 39,421 |  |  | $ | — |  |  | $ | 39,421 |  |  | $ | — |
Commercial paper and corporate bonds |  |  | 6,312 |  |  |  | — |  |  |  | 6,312 |  |  |  | — |  |  |  | 4,822 |  |  |  | — |  |  |  | 4,822 |  |  |  | — |
Total |  | $ | 38,375 |  |  | $ | — |  |  | $ | 38,375 |  |  | $ | — |  |  | $ | 44,243 |  |  | $ | — |  |  | $ | 44,243 |  |  | $ | — |
Maturities of individual securities are less than 12 months and the amortized cost of all securities approximated fair value as of June 30, 2026 and December 31, 2025. Accrued interest receivable on marketable securities is included in amounts receivable and was $236,000 and $250,000 as of June 30, 2026 and December 31, 2025, respectively. There were no transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy during the six months ended June 30, 2026.

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