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Note M - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0		$ 0
Operating Lease, Payments	100		300
Property, Plant and Equipment, Net, Ending Balance	406,410		406,410		$ 450,825
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance	196,542		196,542		$ 202,851
Depreciation, Total	14,334	$ 14,237	28,686	$ 28,532
Leases without Early Cancellation Options [Member] | Other Noncurrent Assets [Member]
Operating Lease, Right-of-Use Asset	$ 1,300		$ 1,300
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years		5 years
Property, Plant and Equipment, Net, Ending Balance	$ 55,200		$ 55,200
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance	27,100		$ 27,100
Depreciation, Total	$ 1,700
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

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 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 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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