Note 4 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2025

Notes Tables

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

	Fair Value Measurements as of December 31, 2025 (000's):
	Quoted Prices		Significant
	in Active		Other		Significant
	Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Fair Value
Assets
Corporate bonds	$	—	$	86,636	$	—	$	86,636
Certificates of deposit		—		14,960		—		14,960
Commercial paper		68,977		—		—		68,977
U.S. government treasuries		1,664		—		—		1,664
Asset-backed securities		—		6,026		—		6,026
Money market funds (cash equivalents)		8,383		—		—		8,383
Total assets	$	79,024	$	107,622	$	—	$	186,646

	Fair Value Measurements as of December 31, 2024 (000's):
	Quoted Prices		Significant
	in Active		Other		Significant
	Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Fair Value
Assets
Corporate bonds	$	—	$	44,963	$	—	$	44,963
Certificates of deposit		—		15,269		—		15,269
Commercial paper		12,084		—		—		12,084
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