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Note 8 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Gross property, plant and equipment $ 69,814 $ 64,019
Accumulated depreciation (55,674) (53,858)
Property plant and equipment, net 14,140 10,161
Buildings and building improvements 5,912 3,224
Accumulated depreciation (1,896) (1,522)
Property, Plant and Equipment [Member]    
Net 4,016 1,702
Land and Land Improvements [Member]    
Gross property, plant and equipment 43 43
Building and Building Improvements [Member]    
Gross property, plant and equipment 7,863 7,747
Buildings and building improvements 2,864 2,955
Machinery, Equipment, Furniture, and Fixtures [Member]    
Buildings and building improvements 3,048 269
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 61,050 55,620
Construction in Progress [Member]    
Gross property, plant and equipment $ 858 $ 609