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Note M - Leases (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 0   $ 0    
Operating Lease, Payments 100   400    
Property, Plant and Equipment, Net, Ending Balance 388,977   388,977   $ 450,825
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance 194,060   194,060   $ 202,851
Depreciation, Total 12,740 $ 13,403 41,426 $ 41,936  
Leases without Early Cancellation Options [Member] | Other Noncurrent Assets [Member]          
Operating Lease, Right-of-Use Asset $ 1,100   $ 1,100    
Trucks under Operating Lease [Member]          
Lessor, Operating Lease, Term of Contract (Year) 5 years   5 years    
Property, Plant and Equipment, Net, Ending Balance $ 55,800   $ 55,800    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance 28,600   $ 28,600    
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