Note 5 - Segment Reporting (Detail) - Base Revenue by Segment, Percentage	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Trucking [Member]
Three Months Ended
Revenues, percentage	69.40%	78.60%	73.40%	80.80%
SCS [Member]
Three Months Ended
Revenues, percentage	25.40%	16.50%	21.80%	14.10%
Intermodal [Member]
Three Months Ended
Revenues, percentage	5.20%	4.90%	4.80%	5.10%