Note 8 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, plant and equipment, gross	$ 338,433	$ 338,385
Less accumulated depreciation and amortization	(121,682)	(116,979)
Property, plant and equipment, net before construction in progress and land	216,751	221,406
Property, plant and equipment, net	243,717	248,444
Land Improvements [Member]
Property, plant and equipment, gross	806	806
Building and Building Improvements [Member]
Property, plant and equipment, gross	83,769	83,846
Machinery and Equipment [Member]
Property, plant and equipment, gross	237,444	237,464
Furniture and Fixtures [Member]
Property, plant and equipment, gross	5,101	5,105
Computer Equipment and Software [Member]
Property, plant and equipment, gross	10,663	10,506
Vehicles [Member]
Property, plant and equipment, gross	650	658
Construction in Progress [Member]
Property, plant and equipment, net	25,865	25,937
Land [Member]
Property, plant and equipment, net	$ 1,101	$ 1,101

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale, excluding construction in progress and land.

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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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