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Note M - Leases (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Lessee, Operating Lease, Term of Contract 5 years   5 years    
Operating Lease, Right-of-Use Asset $ 1,402   $ 1,402    
Lessee, Operating Lease, Renewal Term 5 years   5 years    
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 200        
Operating Lease, Payments $ 100        
Lessor, Operating Lease, Term of Contract 5 years   5 years    
Property, Plant and Equipment, Gross, Ending Balance $ 552,661   $ 552,661   $ 492,325
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance 163,950   163,950   $ 137,738
Depreciation, Total 14,173 $ 12,168 40,974 $ 36,526  
Operating Lease, Liability, Total 1,402   1,402    
Trucks under Operating Lease [Member]          
Property, Plant and Equipment, Gross, Ending Balance 53,800   53,800    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance 25,400   $ 25,400    
Depreciation, Total $ 1,600        
Minimum [Member]          
Lessee, Operating Lease, Term of Contract 1 year   1 year    
Maximum [Member]          
Lessee, Operating Lease, Term of Contract 5 years   5 years