Note 8 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Property, plant and equipment, gross	$ 393,254	$ 363,363
Less accumulated depreciation	(198,672)	(194,086)
Property, plant and equipment, net before construction in progress and land	194,582	169,277
Property, plant and equipment, net	197,781	200,317
Land Improvements [Member]
Property, plant and equipment, gross	806	806
Building and Building Improvements [Member]
Property, plant and equipment, gross	114,644	86,534
Machinery and Equipment [Member]
Property, plant and equipment, gross	259,688	257,842
Furniture and Fixtures [Member]
Property, plant and equipment, gross	4,982	5,449
Computer Equipment and Software [Member]
Property, plant and equipment, gross	12,481	12,059
Vehicles [Member]
Property, plant and equipment, gross	653	673
Construction in Progress [Member]
Property, plant and equipment, net	2,098	29,939
Land [Member]
Property, plant and equipment, net	$ 1,101	$ 1,101