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Note M - Leases (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability     $ 0    
Operating Lease, Payments     200    
Property, Plant and Equipment, Net $ 436,713   436,713   $ 463,595
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 253,299   253,299   $ 242,324
Depreciation $ 15,757 $ 15,481 $ 32,254 $ 30,358  
Trucks under Operating Lease [Member]          
Lessor, Operating Lease, Term of Contract (Year) 5 years   5 years    
Property, Plant and Equipment, Net $ 67,600   $ 67,600    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 36,900   $ 36,900    
Depreciation $ 1,200        
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    
Operating Lease, Right-of-Use Asset $ 400   $ 400