Note 8 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, plant and equipment, gross	$ 362,751	$ 360,975
Less accumulated depreciation and amortization	(148,029)	(142,434)
Property, plant and equipment, net before construction in progress and land	214,722	218,541
Property, plant and equipment, net	248,303	252,984
Land Improvements [Member]
Property, plant and equipment, gross	806	806
Building and Building Improvements [Member]
Property, plant and equipment, gross	88,194	88,280
Machinery and Equipment [Member]
Property, plant and equipment, gross	255,530	253,738
Furniture and Fixtures [Member]
Property, plant and equipment, gross	5,520	5,540
Computer Equipment and Software [Member]
Property, plant and equipment, gross	12,005	11,912
Vehicles [Member]
Property, plant and equipment, gross	696	699
Construction in Progress [Member]
Property, plant and equipment, net	32,480	33,342
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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