Note 4 - Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Property and equipment, gross	$ 19,385	$ 19,234
Less: accumulated depreciation	(14,558)	(13,801)
Property and equipment, net	4,827	5,433
Laboratory Equipment [Member]
Property and equipment, gross	13,963	14,005
Office Equipment [Member]
Property and equipment, gross	1,158	1,142
Leasehold Improvements [Member]
Property and equipment, gross	3,929	3,929
Construction in Progress [Member]
Property and equipment, gross	$ 335	$ 158