Note 5 - Segment Reporting (Detail) - Base Revenue by Segment, Percentage	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Trucking [Member]
Three Months Ended
Revenues, percentage	71.70%	75.80%	72.80%	79.20%
SCS [Member]
Three Months Ended
Revenues, percentage	23.30%	17.90%	22.30%	15.40%
Intermodal [Member]
Three Months Ended
Revenues, percentage	5.00%	6.30%	4.90%	5.40%