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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Note M - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Note M - Leases (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Operating Lease, Payments			$ 100
Property, Plant and Equipment, Net	$ 501,769		501,769		$ 504,719
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	279,527		279,527		$ 266,412
Depreciation	$ 18,705	$ 15,757	$ 37,640	$ 32,254
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years		5 years
Property, Plant and Equipment, Net	$ 66,100		$ 66,100
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	28,500		$ 28,500
Depreciation	$ 2,200
Minimum [Member] \| Shop and Office Leases with Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)	1 year		1 year
Minimum [Member] \| Leases without Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)	3 years		3 years
Maximum [Member] \| Shop and Office Leases with Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years		5 years
Maximum [Member] \| Leases without Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years		5 years