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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, 2026	Mar. 31, 2025	Dec. 31, 2025
Operating Lease, Liability	$ 6,984
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0
Operating Lease, Payments	200
Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization	490,363		$ 516,837
Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization	269,633		$ 275,554
Depreciation	$ 19,244	$ 22,595
Shops and Office Space Leases Without Early Cancellation Options [Member] \| Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	1 year
Shops and Office Space Leases Without Early Cancellation Options [Member] \| Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years
Leases without Early Cancellation Options [Member] \| Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	3 years
Leases without Early Cancellation Options [Member] \| Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	10 years
Trucks under Operating Lease [Member]
Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization	$ 86,700
Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization	39,800
Depreciation	$ 2,700
Trucks under Operating Lease [Member] \| Minimum [Member]
Lessor, Operating Lease, Term of Contract (Month)	5 months
Trucks under Operating Lease [Member] \| Maximum [Member]
Lessor, Operating Lease, Term of Contract (Month)	60 months