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Note 8 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Property, plant and equipment, gross $ 362,649 $ 363,363
Less accumulated depreciation (195,515) (194,086)
Property, plant and equipment, net before construction in progress and land 167,134 169,277
Property, plant and equipment, net 199,941 200,317
Land Improvements [Member]    
Property, plant and equipment, gross 806 806
Building and Building Improvements [Member]    
Property, plant and equipment, gross 85,798 86,534
Machinery and Equipment [Member]    
Property, plant and equipment, gross 257,724 257,842
Furniture and Fixtures [Member]    
Property, plant and equipment, gross 5,189 5,449
Computer Equipment and Software [Member]    
Property, plant and equipment, gross 12,473 12,059
Vehicles [Member]    
Property, plant and equipment, gross 659 673
Construction in Progress [Member]    
Property, plant and equipment, net 31,706 29,939
Land [Member]    
Property, plant and equipment, net $ 1,101 $ 1,101