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Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property, plant and equipment, gross $ 300,576 $ 298,082
Less accumulated depreciation (191,419) (186,303)
Property, plant and equipment, net 109,157 111,779
Land [Member]    
Property, plant and equipment, gross 5,612 4,998
Building [Member]    
Property, plant and equipment, gross 110,679 110,162
Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 184,285 $ 182,922