Note 3 - Cash Equivalents and Investments (Details Textual) - USD ($) |
Sep. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 0 | $ 0 |
| Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | 858 | (0) |
| US Treasury Bill Securities [Member] | ||
| Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current | 16,000,000 | 14,400,000 |
| Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | $ 858 | |
| Debt Securities, Held-to-Maturity, Unrealized Loss Position | $ 0 |
| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (held-to-maturity), in unrealized loss position without allowance for credit loss. No definition available.
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| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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| X | ||||||||||
- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity), classified as current. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Details
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