Note 2 - Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

March 31, 2024	Level 1		Level 2		Level 3		Total
Money market securities	$	5,081	$	—	$	—	$	5,081
Commercial Paper		—		22,222		—		22,222
U.S. Treasuries		—		14,362		—		14,362
Federal agency notes		—		5,752		—		5,752
Total	$	5,081	$	42,336	$	—	$	47,417

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	$	47,417	$	47,417	$	—	$	—	$	—