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 before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business 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, 2023	Mar. 31, 2022	Dec. 31, 2022
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0
Operating Lease, Payments	100
Property, Plant and Equipment, Gross	691,121		$ 705,919
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	244,436		$ 242,324
Depreciation, Total	$ 16,497	$ 14,877
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years
Property, Plant and Equipment, Gross	$ 56,700
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	32,200
Depreciation, Total	$ 1,600
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
Operating Lease, Right-of-Use Asset	$ 400