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Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Property, plant and equipment, gross $ 333,333 $ 306,696
Less accumulated depreciation (203,316) (202,403)
Property, plant and equipment, net 130,017 104,293
Land [Member]    
Property, plant and equipment, gross 6,193 5,813
Building [Member]    
Property, plant and equipment, gross 116,882 112,760
Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 210,258 $ 188,123