Note 13 - Business Segments (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Segment Reporting Information, by Segment [Table Text Block]

(Dollars in thousands)	2012		2011		2010
Operating revenue:
Truckload revenue, net of fuel surcharge revenue	$	378,383	$	357,787	$	325,791
Truckload fuel surcharge revenue		104,940		98,060		66,973
Total Truckload revenue		483,323		455,847		392,764
Logistics revenue, net of intermodal fuel surcharge revenue(1)		138,960		132,890		115,223
Intermodal fuel surcharge revenue		16,173		14,942		8,933
Total Logistics revenue		155,133		147,832		124,156
Total operating revenue	$	638,456	$	603,679	$	516,920
Operating income:
Truckload	$	36,805	$	35,298	$	28,680
Logistics		9,048		7,732		6,609
Total operating income	$	45,853	$	43,030	$	35,289