Note 4 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	Fair Value Measurements as of September 30, 2022 Using:
	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	$	—	$	69,552	$	—	$	69,552
Commercial paper		20,775		—		—		20,775
Certificates of deposit		—		7,448		—		7,448
Asset-backed securities		—		6,346		—		6,346
Cash and cash equivalents		16,481		—		—		16,481
Total assets	$	37,256	$	83,346	$	—	$	120,602

	Fair Value Measurements as of December 31, 2021 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
Assets
Cash and cash equivalents	$	130,005	$	—	$	—	$	130,005
Total assets	$	130,005	$	—	$	—	$	130,005