Note 3 - Cash Equivalents and Investments - Held-to-maturity Investments (Details) - USD ($) |
Sep. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Amortized cost | $ 15,998,427 | $ 14,395,913 |
| Unrealized gains | 3,535 | 10,863 |
| Unrealized Losses | (858) | 0 |
| Aggregate fair value | 16,001,104 | 14,406,776 |
| US Treasury Securities [Member] | ||
| Amortized cost | 15,998,427 | 14,395,913 |
| Unrealized gains | 3,535 | 10,863 |
| Unrealized Losses | (858) | 0 |
| Aggregate fair value | $ 16,001,104 | $ 14,406,776 |
| X | ||||||||||
- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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| X | ||||||||||
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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