Note 3 - Cash Equivalents and Investments (Details Textual) - USD ($) |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 0 | $ 0 |
| Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 29 | 22,547 |
| Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | $ 59,230 | $ 2,284 |
| 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 unrecognized gain 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 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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