Note 4 - Cash, Cash Equivalents and Marketable Securities - Marketable Securities (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Amortized cost	$ 12,444,315
Unrealized gains	263
Unrealized losses	(35,638)
Fair Value	12,408,940	$ 0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized cost	9,445,220
Unrealized gains	263
Unrealized losses	(21,313)
Fair Value	9,424,170
US Treasury Securities [Member]
Amortized cost	2,999,095
Unrealized gains	0
Unrealized losses	(14,325)
Fair Value	$ 2,984,770

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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