Note 4 - Cash, Cash Equivalents and Marketable Securities

3 Months Ended

Mar. 31, 2023

Notes to Financial Statements

Cash, Cash Equivalents, and Marketable Securities [Text Block]

4. Cash, cash equivalents and marketable securities

The following is a summary of the Company's cash and cash equivalents as of the date indicated:

	March 31, 2023		December 31, 2022
Cash in banking institutions	$	631,002	$	1,586,920
Money market funds		14,014,584		8,526,786
Total	$	14,645,586	$	10,113,706

The following is a summary of the Company's marketable securities as of as of the date indicated:

	Amortized cost		Unrealized gains		Unrealized losses			Fair Value
March 31, 2023
Commercial paper	$	1,995,318		210	$	(1,437	)	$	1,994,091
U.S. treasury bonds		999,575		—		(1,896	)		997,679
Total	$	2,994,893		210	$	(3,333	)	$	2,991,770
December 31, 2022
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

The Company's marketable securities generally have contractual maturity dates between 7 and 30 months.

As of March 31, 2023, $1,991,770 of the marketable securities held were in an unrealized loss position, all of which have been in an unrealized loss position for less than twelve months. The Company determined that unrealized losses on marketable securities were primarily due to market conditions, including changes in the U.S. Federal Reserve interest rate, and not credit losses. The Company does not intend to sell the investments and it is not more likely than not that that the Company will be required to sell the investments before the recovery of the amortized cost basis. No allowance for credit losses related to any of these securities was recorded for the three months ended March 31, 2023.