Note 6 - Property and Equipment, Net - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property and equipment, gross	$ 16,300	$ 11,976
Less: accumulated depreciation	(1,847)	(1,629)
Total property, plant and equipment, net	14,453	10,347
Operational Equipment [Member]
Property and equipment, gross	$ 3,581	3,581
Operational Equipment [Member] \| Minimum [Member]
Property and equipment, net, useful life (Year)	3 years
Operational Equipment [Member] \| Maximum [Member]
Property and equipment, net, useful life (Year)	10 years
Laboratory Equipment [Member]
Property and equipment, net, useful life (Year)	5 years
Property and equipment, gross	$ 817	817
Computer Equipment [Member]
Property and equipment, net, useful life (Year)	3 years
Property and equipment, gross	$ 111	89
Office Furniture and Equipment [Member]
Property and equipment, net, useful life (Year)	3 years
Property and equipment, gross	$ 90	90
Leasehold Improvements [Member]
Property and equipment, net, useful life (Year)	2 years 6 months
Property and equipment, gross	$ 80	80
Land [Member]
Property and equipment, gross	$ 1,141	1,141
Building [Member]
Property and equipment, net, useful life (Year)	39 years
Property and equipment, gross	$ 3,131	3,131
Construction in Progress [Member]
Property and equipment, gross	$ 7,349	$ 3,047