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Note 4 - Marketable Securities | 12 Months Ended
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Dec. 31, 2025
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [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 as of December 31, 2025 Using Inputs Considered as |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Commercial paper and corporate bonds |  | $ | 4,822 |  |  | $ | — |  |  | $ | 4,822 |  |  | $ | — |
Government securities |  |  | 39,421 |  |  |  | — |  |  |  | 39,421 |  |  |  | — |
Total marketable securities |  | $ | 44,243 |  |  | $ | — |  |  | $ | 44,243 |  |  | $ | — |
|  |  |  |  |  | Fair Value Measurements as of December 31, 2024 Using Inputs Considered as |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Commercial paper and corporate bonds |  | $ | 28,291 |  |  | $ | — |  |  | $ | 28,291 |  |  | $ | — |
Government securities |  |  | 12,831 |  |  |  | — |  |  |  | 12,831 |  |  |  | — |
Total marketable securities |  | $ | 41,122 |  |  | $ | — |  |  | $ | 41,122 |  |  | $ | — |
Accrued interest receivable on available-for-sale securities was $250,000 and $235,000 for the years ended December 31, 2025 and 2024, respectively, and is included in amounts receivable. There were no transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy during the year ended December 31, 2025. Under the terms of the Company’s investment policy, purchases of marketable securities are limited to investment grade governmental and corporate obligations and bank certificates of deposit with a primary objective of principal preservation. Maturities of individual securities are less than one year, and the amortized cost of all securities approximated fair value as of December 31, 2025 and 2024.

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