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Note M - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			$ 0
Operating Lease, Payments			100
Property, Plant and Equipment, Net	$ 456,920		456,920		$ 463,595
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	257,753		257,753		$ 242,324
Depreciation	$ 15,552	$ 16,289	$ 47,805	$ 46,647
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years		5 years
Property, Plant and Equipment, Net	$ 54,800		$ 54,800
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 25,100		25,100
Depreciation			$ 600
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
Operating Lease, Right-of-Use Asset	$ 200		$ 200

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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X

- 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.

+ References

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- Definition

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

+ References

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

+ References

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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.

+ References

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Amount of lessee's right to use underlying asset under operating lease.

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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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