Note 3 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value Measurements as of March 31, 2025 (000's):
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
Assets
Corporate bonds	$	—	$	50,914	$	—	$	50,914
Commercial paper		5,427		—		—		5,427
Certificates of deposit		—		6,025		—		6,025
U.S. government treasuries		4,449		—		—		4,449
Asset-backed securities		—		4,772		—		4,772
Money market funds (cash equivalents)		18,786		—		—		18,786
Total assets	$	28,662	$	61,711	$	—	$	90,373

	Fair Value Measurements as of December 31, 2024 (000's):
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
Assets
Corporate bonds	$	—	$	44,963	$	—	$	44,963
Commercial paper		12,084		—		—		12,084
Certificates of deposit		—		15,269		—		15,269
U.S. government treasuries		4,399		—		—		4,399
Asset-backed securities		—		6,524		—		6,524
Money market funds (cash equivalents)		23,880		—		—		23,880
Total assets	$	40,363	$	66,756	$	—	$	107,119