Note 4 - Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property and equipment, gross	$ 18,836	$ 18,562
Less: accumulated depreciation	(7,734)	(6,831)
Property and equipment, net	11,102	11,731
Laboratory Equipment [Member]
Property and equipment, gross	13,507	13,448
Office Equipment [Member]
Property and equipment, gross	1,105	1,105
Leasehold Improvements [Member]
Property and equipment, gross	3,998	3,985
Construction in Progress [Member]
Property and equipment, gross	$ 226	$ 24