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Note 3 - Cash, Cash Equivalents, and Marketable Securities

3 Months Ended

Mar. 31, 2024

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

Note 3. Cash, Cash Equivalents, and Marketable Securities

Available-for-Sale Securities

Available-for-sale securities as of March 31, 2024 were as follows:

	*March 31, 2024*
(in thousands)	*Amortized Cost*		*Gross Unrealized Gains*		*Gross Unrealized Losses*			*Fair Value*
Cash equivalents (contractual maturity within 90 days):
U.S. Treasury securities	$	12,192	$	—	$	(1	)	$	12,191
Money market funds		5,660		—		—			5,660
Total cash equivalents		17,852		—		(1	)		17,851
Cash		3,881		—		—			3,881
Total cash and cash equivalents	$	21,733	$	—	$	(1	)	$	21,732

Marketable securities (contractual maturity greater than 90 days but less than 1 year):
U.S. Treasury securities	$	6,179	$	—	$	(1	)	$	6,178
Total marketable securities	$	6,179	$	—	$	(1	)	$	6,178

Available-for-sale securities as of December 31, 2023 were as follows:

	*December 31, 2023*
(in thousands)	*Amortized Cost*		*Gross Unrealized Gains*		*Gross Unrealized Losses*		*Fair Value*
Cash equivalents (contractual maturity within 90 days):
U.S. Treasury securities	$	19,883	$	1	$	—	$	19,884
Money market funds		5,113		—		—		5,113
Total cash equivalents		24,996		1		—		24,997
Cash		3,824		—		—		3,824
Total cash and cash equivalents	$	28,820	$	1	$	—	$	28,821

Marketable securities (contractual maturity greater than 90 days but less than 1 year):
U.S. Treasury securities	$	6,179	$	—	$	—	$	6,179
Total marketable securities	$	6,179	$	—	$	—	$	6,179

We received proceeds of $6.3 million and $5.0 million from the maturity of marketable securities during the three months ended March 31, 2024 and 2023, respectively. We had no realized gains or losses from the sale of available-for-sale securities during the three months ended March 31, 2024 and 2023. As of March 31, 2024 and December 31, 2023, we did not have any allowance for credit losses or impairments of available-for-sale securities.