Note 6 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, plant and equipment, gross	$ 436	$ 384
Less accumulated depreciation	316	228
Property, plant and equipment, net	120	156
Machinery and Equipment [Member]
Property, plant and equipment, gross	$ 13	14
Machinery and Equipment [Member] | Minimum [Member]
Property, plant and equipment, Depreciable Lives (Year)	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, plant and equipment, Depreciable Lives (Year)	7 years
Furniture and Fixtures [Member]
Property, plant and equipment, gross	$ 423	$ 370
Furniture and Fixtures [Member] | Minimum [Member]
Property, plant and equipment, Depreciable Lives (Year)	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, plant and equipment, Depreciable Lives (Year)	7 years