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Note M - Leases (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 0
Operating Lease, Payments		200
Property, Plant and Equipment, Net, Total	$ 385,789	385,789		$ 384,179
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance	214,990	214,990		$ 201,124
Depreciation, Total		14,877	$ 14,352
Leases without Early Cancellation Options [Member] | Other Noncurrent Assets [Member]
Operating Lease, Right-of-Use Asset	$ 800	$ 800
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years	5 years
Property, Plant and Equipment, Net, Total	$ 56,700	$ 56,700
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance	33,300	$ 33,300
Depreciation, Total	$ 1,900
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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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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