Note 2 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

December 31, 2024	Level 1		Level 2		Level 3		Total
Money market securities	$	112	$	—	$	—	$	112
Commercial paper		—		10,633		—		10,633
U.S. treasuries		—		9,192		—		9,192
Federal agency notes		—		5,317		—		5,317
Total	$	112	$	25,142	$	—	$	25,254

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	$	25,254	$	25,254	$	—	$	—	$	—