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Note M - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024
Operating Lease, Payments	$ 50		$ 900
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	1,000
Property, Plant and Equipment, Net	494,846		494,846			$ 527,218
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	281,194		281,194			$ 309,272
Depreciation	21,719	$ 18,705	44,315	$ 37,640
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)					5 years
Property, Plant and Equipment, Net	67,500		67,500
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 33,900		33,900
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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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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