Note 4 - Segment Reporting (Detail) - Base Revenue by Segment, Percentage	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Trucking [Member]
Three Months Ended
Revenues, percentage	76.10%	77.60%
SCS [Member]
Three Months Ended
Revenues, percentage	20.50%	18.00%
Intermodal [Member]
Three Months Ended
Revenues, percentage	3.50%	4.40%