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Note 7 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property, plant and equipment, gross $ 150,929 $ 168,377
Accumulated depreciation (113,595) (126,434)
Property, plant and equipment, net 37,334 41,943
Land [Member]    
Property, plant and equipment, gross 1,428 1,431
Building and Building Improvements [Member]    
Property, plant and equipment, gross 22,647 29,722
Machinery and Equipment [Member]    
Property, plant and equipment, gross 124,192 132,134
Construction in Progress [Member]    
Property, plant and equipment, gross $ 2,662 $ 5,090