Note 8 - Property, Plant & Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property, plant and equipment, gross	$ 368,511	$ 360,975
Less accumulated depreciation and amortization	(155,507)	(142,434)
Property, plant and equipment, net before construction in progress and land	213,004	218,541
Property, plant and equipment, net	246,797	252,984
Land Improvements [Member]
Property, plant and equipment, gross	806	806
Building and Building Improvements [Member]
Property, plant and equipment, gross	89,127	88,280
Machinery and Equipment [Member]
Property, plant and equipment, gross	259,651	253,738
Furniture and Fixtures [Member]
Property, plant and equipment, gross	5,607	5,540
Computer Equipment and Software [Member]
Property, plant and equipment, gross	12,610	11,912
Vehicles [Member]
Property, plant and equipment, gross	710	699
Construction in Progress [Member]
Property, plant and equipment, net	32,692	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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