Note 4 - Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Property and equipment, gross	$ 19,245	$ 19,213
Less: accumulated depreciation	(11,424)	(10,508)
Property and equipment, net	7,821	8,705
Laboratory Equipment [Member]
Property and equipment, gross	13,910	13,806
Office Equipment [Member]
Property and equipment, gross	1,142	1,140
Leasehold Improvements [Member]
Property and equipment, gross	4,107	4,107
Construction in Progress [Member]
Property and equipment, gross	$ 86	$ 160