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Note 1 - Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, plant and equipment, gross	$ 302,043	$ 298,082
Less accumulated depreciation	(193,377)	(186,303)
Property, plant and equipment, net	108,666	111,779
Land [Member]
Property, plant and equipment, gross	5,805	4,998
Building [Member]
Property, plant and equipment, gross	111,876	110,162
Machinery and Equipment [Member]
Property, plant and equipment, gross	$ 184,362	$ 182,922

X

- Definition

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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