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Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property, plant and equipment, gross $ 304,865 $ 302,043
Less accumulated depreciation (200,100) (193,377)
Property, plant and equipment, net 104,765 108,666
Land [Member]    
Property, plant and equipment, gross 5,864 5,805
Building [Member]    
Property, plant and equipment, gross 111,488 111,876
Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 187,513 $ 184,362