Note H - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property, plant and equipment, gross	$ 414,237	$ 363,363
Less accumulated depreciation and amortization	(204,500)	(194,086)
Property, plant and equipment, net before construction in progress and land	209,737	169,277
Property, plant and equipment, net	219,235	200,317
Land Improvements [Member]
Property, plant and equipment, gross	806	806
Building and Building Improvements [Member]
Property, plant and equipment, gross	118,648	86,534
Machinery and Equipment [Member]
Property, plant and equipment, gross	275,617	257,842
Furniture and Fixtures [Member]
Property, plant and equipment, gross	5,150	5,449
Computer Equipment and Software [Member]
Property, plant and equipment, gross	13,369	12,059
Vehicles [Member]
Property, plant and equipment, gross	647	673
Construction in Progress [Member]
Property, plant and equipment, net	8,397	29,939
Land [Member]
Property, plant and equipment, net	$ 1,101	$ 1,101