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Note M - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Note M - Leases (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Operating Lease, Liability	$ 6,799		$ 6,799
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0
Operating Lease, Payments			400
Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization	499,468		499,468		$ 516,837
Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization	259,476		259,476		$ 275,554
Depreciation	$ 19,337	$ 21,719	$ 38,581	$ 44,315
Shops and Office Space Leases Without Early Cancellation Options [Member] \| Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	1 year		1 year
Shops and Office Space Leases Without Early Cancellation Options [Member] \| Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years		5 years
Leases without Early Cancellation Options [Member] \| Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	3 years		3 years
Leases without Early Cancellation Options [Member] \| Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	10 years		10 years
Trucks under Operating Lease [Member]
Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization	$ 68,400		$ 68,400
Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization	28,400		$ 28,400
Depreciation	$ 1,300
Trucks under Operating Lease [Member] \| Minimum [Member]
Lessor, Operating Lease, Term of Contract (Month)	5 months		5 months
Trucks under Operating Lease [Member] \| Maximum [Member]
Lessor, Operating Lease, Term of Contract (Month)	60 months		60 months