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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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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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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, 2025	Mar. 31, 2024	Dec. 31, 2024
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0
Operating Lease, Payments	0
Property, Plant and Equipment, Net	505,504		$ 527,218
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	294,879		$ 309,272
Depreciation	$ 22,595	$ 18,935
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years
Property, Plant and Equipment, Net	$ 67,800
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	31,700
Depreciation	$ 2,500
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
Maximum [Member] \| Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)	60 months