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Note 4 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2025
Notes Tables |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | December 31, 2025 |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market accounts |  | $ | 6,300,291 |  |  | $ | — |  |  | $ | — |
Commercial paper |  |  | — |  |  |  | 999,330 |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | — |  |  |  | 11,139,880 |  |  |  | — |
US treasury bonds |  |  | — |  |  |  | 1,238,538 |  |  |  | — |
US government agency bonds |  |  | — |  |  |  | 250,552 |  |  |  | — |
Total assets measured at fair value |  | $ | 6,300,291 |  |  | $ | 13,628,300 |  |  | $ | — |
|  | December 31, 2024 |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents (money market accounts) |  | $ | 7,559,336 |  |  | $ | — |  |  | $ | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | — |  |  |  | 18,032,943 |  |  |  | — |
US treasury bonds |  |  | — |  |  |  | 7,951,060 |  |  |  | — |
US government agency bonds |  |  | — |  |  |  | 3,938,520 |  |  |  | — |
Total assets measured at fair value |  | $ | 7,559,336 |  |  | $ | 29,922,523 |  |  | $ | — |
Marketable Securities [Table Text Block] |
|  | December 31, 2025 |
|  | Amortized Cost |  |  | Unrealized gains |  |  | Unrealized losses |  |  | Fair Value |
Commercial paper |  | $ | 11,134,856 |  |  | $ | 5,024 |  |  | $ | — |  |  | $ | 11,139,880 |
US treasury bonds |  |  | 1,237,794 |  |  |  | 744 |  |  |  | — |  |  |  | 1,238,538 |
US government agency bonds |  |  | 250,504 |  |  |  | 48 |  |  |  | — |  |  |  | 250,552 |
Total |  | $ | 12,623,154 |  |  | $ | 5,816 |  |  | $ | — |  |  | $ | 12,628,970 |
|  | December 31, 2024 |
|  | Amortized Cost |  |  | Unrealized gains |  |  | Unrealized losses |  |  | Fair Value |
Commercial paper |  | $ | 18,019,334 |  |  | $ | 16,393 |  |  | $ | (2,784 | ) |  | $ | 18,032,943 |
US treasury bonds |  |  | 7,920,620 |  |  |  | 30,440 |  |  |  | — |  |  |  | 7,951,060 |
US government agency bonds |  |  | 3,926,372 |  |  |  | 12,148 |  |  |  | — |  |  |  | 3,938,520 |
Total |  | $ | 29,866,326 |  |  | $ | 58,981 |  |  | $ | (2,784 | ) |  | $ | 29,922,523 |

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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 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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