Note 5 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Gross property, plant and equipment	$ 660,424	$ 727,513
Less accumulated depreciation	426,501	462,553
Net property, plant and equipment	233,923	264,960
Land [Member]
Gross property, plant and equipment	16,515	20,374
Building [Member]
Gross property, plant and equipment	100,730	109,470
Machinery and Equipment [Member]
Gross property, plant and equipment	486,517	531,838
Furniture and Fixtures [Member]
Gross property, plant and equipment	15,594	15,668
Software and Software Development Costs [Member]
Gross property, plant and equipment	22,440	25,218
Construction in Progress [Member]
Gross property, plant and equipment	$ 18,628	$ 24,945

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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