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

6 Months Ended

Jun. 30, 2022

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

	June 30, 2022		December 31, 2021
Cash in banking institutions	$	1,084,595	$	30,308,075
Money market funds		3,886,704		7,005,483
Commercial paper		994,427		—
Total	$	5,965,726	$	37,313,558

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

	Amortized cost		Unrealized gains		Unrealized losses			Fair Value
Commercial paper	$	17,658,057	$	25	$	(57,001	)	$	17,601,081
U.S. treasury bonds		5,003,207		—		(29,607	)		4,973,600
Total	$	22,661,264	$	25	$	(86,608	)	$	22,574,681