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Note 2 - Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
September 30, 2025 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Money market securities |  | $ | 1,604 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,604 |
Commercial paper |  |  | — |  |  |  | 4,390 |  |  |  | — |  |  |  | 4,390 |
Federal agency notes |  |  | — |  |  |  | 3,212 |  |  |  | — |  |  |  | 3,212 |
U.S. treasuries |  |  | — |  |  |  | 1,996 |  |  |  | — |  |  |  | 1,996 |
Total |  | $ | 1,604 |  |  | $ | 9,598 |  |  | $ | — |  |  | $ | 11,202 |
December 31, 2024 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Money market securities |  | $ | 112 |  |  | $ | — |  |  | $ | — |  |  | $ | 112 |
Commercial paper |  |  | — |  |  |  | 10,633 |  |  |  | — |  |  |  | 10,633 |
U.S. treasuries |  |  | — |  |  |  | 9,192 |  |  |  | — |  |  |  | 9,192 |
Federal agency notes |  |  | — |  |  |  | 5,317 |  |  |  | — |  |  |  | 5,317 |
Total |  | $ | 112 |  |  | $ | 25,142 |  |  | $ | — |  |  | $ | 25,254 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Maturities by Period |
|  |  |  |  |  | Less than |  |  | 1-5 |  |  | 5-10 |  |  | More than |
|  | Total |  |  | 1 year |  |  | years |  |  | years |  |  | 10 years |
Cash equivalents and marketable securities |  | $ | 11,202 |  |  | $ | 11,202 |  |  | $ | — |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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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 No definition available. + Details
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