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Note 4 - Fair Value of Financial Instruments - Marketable Securities (Details) - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost | $ 12,623,154 | $ 29,866,326
Commercial paper | 5,816 | 58,981
Commercial paper | 0 | (2,784)
Commercial paper | 12,628,970 | 29,922,523
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Amortized Cost | 11,134,856 | 18,019,334
Commercial paper | 5,024 | 16,393
Commercial paper | 0 | (2,784)
Commercial paper | 11,139,880 | 18,032,943
US Treasury Bond Securities [Member] |  |
Amortized Cost | 1,237,794 | 7,920,620
Commercial paper | 744 | 30,440
Commercial paper | 0 | 0
Commercial paper | 1,238,538 | 7,951,060
US Treasury Securities [Member] |  |
Amortized Cost | 250,504 | 3,926,372
Commercial paper | 48 | 12,148
Commercial paper | 0 | 0
Commercial paper | $ 250,552 | $ 3,938,520

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