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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Note M - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Note M - Leases (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Operating Lease, Right-of-Use Asset	$ 29
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0
Operating Lease, Payments	100
Property, Plant and Equipment, Net	501,325		$ 504,719
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	270,631		$ 266,412
Depreciation	18,935	$ 16,497
Leases without Early Cancellation Options [Member]
Operating Lease, Right-of-Use Asset	$ 30
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years
Property, Plant and Equipment, Net	$ 58,600
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	24,400
Depreciation	$ 2,000
Minimum [Member] \| Shop and Office Leases with Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)	1 year
Minimum [Member] \| Leases without Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)	3 years
Maximum [Member] \| Shop and Office Leases with Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years
Maximum [Member] \| Leases without Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years