Note 4 - Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Marketable Securities [Table Text Block]

	Fair Value Measurements as of March 31, 2024 Using:
	Amortized Cost		Unrealized gains		Unrealized Losses			Fair Value
Assets
Corporate bonds	$	61,948	$	33	$	(67	)	$	61,914
Commercial paper		30,130		6		(12	)		30,124
Certificates of deposit		17,931		13		(1	)		17,943
U.S. government treasuries		12,733		—		(75	)		12,658
Asset-backed securities		9,928		20		(6	)		9,942
Total assets	$	132,670	$	72	$	(161	)	$	132,581

	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

Investments Classified by Contractual Maturity Date [Table Text Block]

	As of
	March 31, 2024		December 31, 2023
Maturing in one year or less	$	99,172	$	93,117
Maturing after one year through two years		33,409		35,116
Total	$	132,581	$	128,233