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Note 9 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Gross property, plant and equipment $ 64,019 $ 64,049
Accumulated depreciation (53,858) (52,374)
Property plant and equipment net 10,161 11,675
Capital Leased Assets, Gross 3,224 4,674
Accumulated depreciation (1,522) (1,495)
Capital Leased Assets, Net 1,702 3,179
Land and Land Improvements [Member]    
Gross property, plant and equipment 43 50
Building and Building Improvements [Member]    
Gross property, plant and equipment 7,747 8,108
Capital Leased Assets, Gross 2,955 3,128
Machinery, Equipment, Furniture, and Fixtures [Member]    
Capital Leased Assets, Gross 269 1,546
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 55,620 55,520
Construction in Progress [Member]    
Gross property, plant and equipment $ 609 $ 371