Note 5 - Property and Equipment, Net - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property and equipment, gross	$ 1,930	$ 1,915
Accumulated depreciation	(1,522)	(1,406)
Property and equipment, net	408	509
Production and Lab Equipment [Member]
Property and equipment, gross	542	542
Tooling [Member]
Property and equipment, gross	572	562
Computer Equipment [Member]
Property and equipment, gross	620	615
Furniture and Fixtures [Member]
Property and equipment, gross	$ 196	$ 196