Note 8 - Segment Reporting - Reconciliation of Net Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Total revenues	$ 0	$ 0	$ 0	$ 0
Adjusted general and administrative	8,187	4,496	15,918	8,370
Total other income, net	1,107	343	2,356	821
Net loss	(19,168)	(11,383)	(35,963)	(21,520)
Operating Segments [Member]
Total revenues	0	0	0	0
Cross platform research and engineering	4,122	3,289	7,587	6,502
Manufacturing	2,695	1,099	4,330	2,121
Clinical and regulatory	2,009	967	3,539	1,668
Adjusted general and administrative	3,828	3,185	7,619	6,517
Sales and marketing	2,160	836	3,820	1,124
Other segment items	5,461	2,350	11,424	4,409
Total other income, net	(1,107)	(343)	(2,356)	(821)
Net loss	$ (19,168)	$ (11,383)	$ (35,963)	$ (21,520)