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Note 4 - Fair Value of Financial Instruments - Marketable Securities (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Amortized cost	$ 17,850,864	$ 29,866,326
Unrealized gains	6,250	58,981
Unrealized losses	(426)	(2,784)
Marketable securities	17,856,688	29,922,523
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized cost	16,353,393	18,019,334
Unrealized gains	6,250	16,393
Unrealized losses	0	(2,784)
Marketable securities	16,359,643	18,032,943
US Treasury Bond Securities [Member]
Amortized cost		7,920,620
Unrealized gains		30,440
Unrealized losses		0
Marketable securities		7,951,060
Corporate Debt Securities [Member]
Amortized cost	1,497,471
Unrealized gains	0
Unrealized losses	(426)
Marketable securities	$ 1,497,045
US Treasury Securities [Member]
Amortized cost		3,926,372
Unrealized gains		12,148
Unrealized losses		0
Marketable securities		$ 3,938,520

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