Note 7 - Property and Equipment, Net - Property and Equipment, Net (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Property and equipment, gross	$ 11,976,000	$ 8,837,000
Less: accumulated depreciation	(1,629,000)	(1,494,000)
Property, plant and equipment, net	10,347,000	7,343,000
Operational Equipment [Member]
Property and equipment, gross	$ 3,581,000	1,445,000
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	$ 817,000	730,000
Computer Equipment [Member]
Property and equipment, net, useful life (Year)	3 years
Property and equipment, gross	$ 89,000	6,000
Office Furniture and Equipment [Member]
Property and equipment, net, useful life (Year)	3 years
Property and equipment, gross	$ 90,000	90,000
Leasehold Improvements [Member]
Property and equipment, net, useful life (Year)	2 years 6 months
Property and equipment, gross	$ 80,000	80,000
Land [Member]
Property and equipment, gross	$ 1,141
Building [Member]
Property and equipment, net, useful life (Year)	39 years
Property and equipment, gross	$ 3,131
Construction in Progress [Member]
Property and equipment, gross	$ 3,047,000	$ 6,486,000