Note 2 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

September 30, 2024	Level 1		Level 2		Level 3		Total
Money market securities	$	2,853	$	—	$	—	$	2,853
Commercial paper		—		14,227		—		14,227
Federal agency notes		—		13,454		—		13,454
U.S. treasuries		—		2,489		—		2,489
Total	$	2,853	$	30,170	$	—	$	33,023

December 31, 2023	Level 1		Level 2		Level 3		Total
Money market securities	$	1,515	$	—	$	—	$	1,515
Commercial paper		—		14,622		—		14,622
U.S. treasuries		—		5,953		—		5,953
Federal agency notes		—		998		—		998
Total	$	1,515	$	21,573	$	—	$	23,088

Investments Classified by Contractual Maturity Date [Table Text Block]

	Maturities by Period
			Less than		1-5		5-10		More than
	Total		1 year		years		years		10 years
Cash equivalents and marketable securities	$	33,023	$	33,023	$	—	$	—	$	—