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Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Property, plant and equipment, gross $ 344,478 $ 337,993
Less accumulated depreciation (212,287) (209,353)
Property, plant and equipment, net 132,191 128,640
Land [Member]    
Property, plant and equipment, gross 6,225 6,215
Building [Member]    
Property, plant and equipment, gross 119,858 119,197
Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 218,395 $ 212,581