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Note M - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Operating Lease, Liability	$ 836		$ 836
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0
Operating Lease, Payments			100
Property, Plant and Equipment, Net	501,291		501,291		$ 527,218
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	282,625		282,625		$ 309,272
Depreciation	$ 19,805	$ 17,741	$ 64,119	$ 55,381
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years		5 years
Property, Plant and Equipment, Net	$ 67,300		$ 67,300
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 36,100		36,100
Depreciation			$ 2,400
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

X

- Definition

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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- Definition

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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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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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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