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Note M - Leases (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Operating Lease, Payments $ 100        
Property, Plant and Equipment, Gross, Ending Balance 595,300   $ 595,300   $ 563,162
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance 195,142   195,142   $ 175,887
Depreciation, Total 14,237 $ 13,614 28,532 $ 26,801  
Trucks under Operating Lease [Member]          
Property, Plant and Equipment, Gross, Ending Balance 59,700   59,700    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance 28,300   28,300    
Depreciation, Total     1,400    
Accrued Expenses And Other Liabilities And Other Long-term Liabilities [Member]          
Operating Lease, Right-of-Use Asset 1,827   1,827    
Operating Lease, Liability, Total 1,827   1,827    
Leases without Early Cancellation Options [Member] | Other Noncurrent Assets [Member]          
Operating Lease, Right-of-Use Asset 1,800   1,800    
Leases without Early Cancellation Options [Member] | Accrued Expenses And Other Liabilities And Other Long-term Liabilities [Member]          
Operating Lease, Liability, Total $ 1,800   $ 1,800    
Trucks under Operating Lease [Member]          
Lessor, Operating Lease, Term of Contract (Year) 5 years   5 years    
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