Note 5 - Segment Reporting (Details Textual) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Operating Segments [Member] | Trucking [Member] | Foreign Countries [Member]
Revenues		$ 10,700	$ 14,600	$ 32,500	$ 45,000
Operating Segments [Member] | Trucking [Member]
Revenues	[1]	85,369	108,440	275,617	317,664
Trucking [Member]
Revenues		84,982	108,318	$ 274,196	317,230
Number of Reportable Segments				2
Revenues		$ 123,490	$ 153,618	$ 389,950	$ 452,405

[1] Includes foreign revenue of $10.7 million and $32.5 million for the three and nine months ended September 30, 2015, respectively, and $14.6 million and $45.0 million for the three and nine months ended September 30, 2014, respectively. All foreign revenue is paid in US dollars.