Note 3 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

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

	Fair Value Measurements as of September 30, 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	$	—	$	55,766	$	—	$	55,766
Commercial paper		14,302		—		—		14,302
Certificates of deposit		—		15,728		—		15,728
U.S. government treasuries		4,448		—		—		4,448
Asset-backed securities		—		8,357		—		8,357
Total assets	$	18,750	$	79,851	$	—	$	98,601

	Fair Value Measurements as of December 31, 2023 (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	$	—	$	54,281	$	—	$	54,281
Commercial paper		28,534		—		—		28,534
Certificates of deposit		—		18,866		—		18,866
U.S. government treasuries		16,080		—		—		16,080
Asset-backed securities		—		10,472		—		10,472
Money market funds (cash equivalents)		575		—		—		575
Total assets	$	45,189	$	83,619	$	—	$	128,808