Note 7 - Property, Plant and Equipment, Net - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Property and equipment, gross	$ 13,468	$ 8,837
Less: accumulated depreciation	(1,517)	(1,494)
Total property, plant and equipment, net	11,951	7,343
Operational Equipment [Member]
Property and equipment, gross	$ 4,501	1,445
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	$ 730	730
Computer Equipment [Member]
Property and equipment, net, useful life (Year)	3 years
Property and equipment, gross	$ 6	6
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	0
Building [Member]
Property and equipment, net, useful life (Year)	39 years
Property and equipment, gross	$ 3,131	0
Construction in Progress [Member]
Property and equipment, gross	$ 3,789	$ 6,486