Note 4 - Segment Reporting (Details) - Base Revenue by Segment, Percentage	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Trucking [Member]
Three Months Ended
Revenues, percentage	73.10%	69.40%	74.50%	73.40%
SCS and Intermodal [Member]
Three Months Ended
Revenues, percentage	26.90%	30.60%	25.50%	26.60%