Note 6- Property and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, plant, and equipment gross	$ 8,845	$ 10,296
Property, plant, and equipment accumulated depreciation	4,607	4,276
Property and equipment, net	4,238	6,020
Land [Member]
Property, plant, and equipment gross	493	493
Furniture and Fixtures [Member]
Property, plant, and equipment gross	$ 0	71
Furniture and Fixtures [Member] | Minimum [Member]
Estimated useful lives (Year)	7 years
Furniture and Fixtures [Member] | Maximum [Member]
Estimated useful lives (Year)	10 years
Plant [Member]
Property, plant, and equipment gross	$ 1,902	3,440
Plant [Member] | Minimum [Member]
Estimated useful lives (Year)	20 years
Plant [Member] | Maximum [Member]
Estimated useful lives (Year)	40 years
Computer and Software [Member]
Property, plant, and equipment gross	$ 27	382
Computer and Software [Member] | Minimum [Member]
Estimated useful lives (Year)	3 years
Computer and Software [Member] | Maximum [Member]
Estimated useful lives (Year)	5 years
Leasehold Improvements [Member]
Property, plant, and equipment gross	$ 0	152
Leasehold Improvements [Member] | Minimum [Member]
Estimated useful lives (Year)	5 years
Leasehold Improvements [Member] | Maximum [Member]
Estimated useful lives (Year)	6 years
Machinery and Equipment [Member]
Property, plant, and equipment gross	$ 6,423	$ 5,758
Machinery and Equipment [Member] | Minimum [Member]
Estimated useful lives (Year)	5 years
Machinery and Equipment [Member] | Maximum [Member]
Estimated useful lives (Year)	15 years