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Note 7 - Investments (Tables) | 3 Months Ended
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Mar. 31, 2026
Notes Tables |
Marketable Securities [Table Text Block] |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost Basis |  |  | Gains |  |  | Losses |  |  | Fair Value |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 4 |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
U.S. government |  |  | 9,439 |  |  |  | — |  |  |  | — |  |  |  | 9,439 |
Total cash equivalents |  |  | 9,443 |  |  |  | — |  |  | $ | — |  |  |  | 9,443 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government |  |  | 24,803 |  |  |  | 2 |  |  |  | — |  |  |  | 24,805 |
Corporate bonds |  |  | 3,545 |  |  |  | 4 |  |  |  | — |  |  |  | 3,549 |
Commercial paper |  |  | 1,434 |  |  |  | 1 |  |  |  | — |  |  |  | 1,435 |
Certificates of deposit |  |  | 516 |  |  |  | 1 |  |  |  | — |  |  |  | 517 |
Total marketable securities |  |  | 30,298 |  |  |  | 8 |  |  |  | — |  |  |  | 30,306 |
Total assets at fair value |  | $ | 39,741 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 39,749 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | March 31, |  |  | December 31, |
|  | 2026 |  |  | 2025 |
Maturities within one year |  | $ | 39,749 |  |  | $ | 49,329 |
Maturities after one year through three years |  |  | — |  |  |  | — |
Total investments |  | $ | 39,749 |  |  | $ | 49,329 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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