Note 4 - Segment Reporting (Details) - Segment Reporting Information, by Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Base revenue
Base revenue	$ 117,611	$ 104,887
Fuel surcharge revenue
Fuel surcharge revenue	27,878	27,140
Total revenue	145,489	132,027
Operating Income (Loss)
Operating loss	(1,043)	(2,827)
Depreciation and Amortization
Depreciation and amortization	11,455	10,915
Operating Segments [Member] | Trucking [Member]
Base revenue
Base revenue	80,336	79,803
Fuel surcharge revenue
Fuel surcharge revenue	22,578	22,225
Operating Income (Loss)
Operating loss	(6,120)	(3,978)
Depreciation and Amortization
Depreciation and amortization	10,834	10,254
Operating Segments [Member] | SCS [Member]
Base revenue
Base revenue	39,405	26,787
Fuel surcharge revenue
Fuel surcharge revenue	5,847	5,377
Operating Income (Loss)
Operating loss	5,077	1,151
Depreciation and Amortization
Depreciation and amortization	49	79
Intersegment Eliminations [Member]
Base revenue
Base revenue	(2,130)	(1,703)
Fuel surcharge revenue
Fuel surcharge revenue	(547)	(462)
Corporate, Non-Segment [Member]
Depreciation and Amortization
Depreciation and amortization	$ 572	$ 582