Note 4 - Cash, Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

	December 31,
	2022		2021
Cash in banking institutions	$	1,586,920	$	30,308,075
Money market funds		8,526,786		7,005,483
Total	$	10,113,706	$	37,313,558

Debt Securities, Available-for-Sale [Table Text Block]

	Amortized cost		Unrealized gains		Unrealized losses			Fair Value
Commercial paper	$	9,445,220	$	263	$	(21,313	)	$	9,424,170
U.S. treasury bonds		2,999,095		—		(14,325	)		2,984,770
Total	$	12,444,315	$	263	$	(35,638	)	$	12,408,940