Note 5 - Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Marketable Securities [Table Text Block]

	Fair Value Measurements as of December 31, 2023 Using:
	Amortized Cost		Unrealized gains		Unrealized Losses			Fair Value
Assets
Corporate bonds	$	54,256	$	74	$	(49	)	$	54,281
Commercial paper		28,507		30		(3	)		28,534
Certificates of deposit		18,850		17		(1	)		18,866
U.S. government treasuries		16,127		3		(50	)		16,080
Asset-backed securities		10,456		23		(7	)		10,472
Total assets	$	128,196	$	147	$	(110	)	$	128,233

	Fair Value Measurements as of December 31, 2022 Using:
	Amortized Cost		Unrealized gains		Unrealized Losses			Fair Value
Assets
Corporate bonds	$	87,998	$	12	$	(250	)	$	87,760
Commercial paper		37,680		33		(31	)		37,682
Certificates of deposit		19,689		16		(38	)		19,667
Asset-backed securities		6,598		3		(47	)		6,554
Total assets	$	151,965	$	64	$	(366	)	$	151,663

Investments Classified by Contractual Maturity Date [Table Text Block]

	As of December 31,
	2023		2022
Maturing in one year or less		93,117		134,620
Maturing after one year through two years		35,116		17,043
Total	$	128,233	$	151,663