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Note 1 - Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Property, plant and equipment, gross $ 355,298 $ 337,993
Less accumulated depreciation (220,426) (209,353)
Property, plant and equipment, net 134,872 128,640
Land [Member]    
Property, plant and equipment, gross 6,214 6,215
Building [Member]    
Property, plant and equipment, gross 121,517 119,197
Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 227,567 $ 212,581