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Note 4 - Cash, Cash Equivalents and Marketable Securities - Marketable Securities (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Amortized cost	$ 19,357,895
Commercial paper	0
Commercial paper	(86,955)
Fair Value	19,270,940	$ 0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized cost	15,357,565
Commercial paper	0
Commercial paper	(56,985)
Fair Value	15,300,580
US Treasury Securities [Member]
Amortized cost	4,000,330
Commercial paper	0
Commercial paper	(29,970)
Fair Value	$ 3,970,360

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