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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue, before fuel surcharges	$ 92,979	$ 133,000	$ 222,134	$ 261,686
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 85,765	$ 112,352	$ 197,587	$ 222,696
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 69,958	$ 92,867	$ 161,268	$ 182,879
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	81.60%	82.70%	81.60%	82.10%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 15,807	$ 19,485	$ 36,319	$ 39,817
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges, percentage	18.40%	17.30%	18.40%	17.90%

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