Note 7- Property and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Property, plant, and equipment gross	$ 28,806	$ 28,847
Property, plant, and equipment accumulated depreciation	13,919	13,403
Property and equipment, net	14,887	15,444
Land [Member]
Property, plant, and equipment gross	730	730
Furniture and Fixtures [Member]
Property, plant, and equipment gross	$ 265	265
Furniture and Fixtures [Member] \| Minimum [Member]
Estimated useful lives (Year)	5 years
Furniture and Fixtures [Member] \| Maximum [Member]
Estimated useful lives (Year)	10 years
Plant [Member]
Property, plant, and equipment gross	$ 10,554	10,457
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	$ 452	452
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	$ 1,828	1,828
Leasehold Improvements [Member] \| Minimum [Member]
Estimated useful lives (Year)	4 years
Leasehold Improvements [Member] \| Maximum [Member]
Estimated useful lives (Year)	15 years
Machinery and Equipment [Member]
Property, plant, and equipment gross	$ 14,977	$ 15,115
Machinery and Equipment [Member] \| Minimum [Member]
Estimated useful lives (Year)	5 years
Machinery and Equipment [Member] \| Maximum [Member]
Estimated useful lives (Year)	15 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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