Note 4 - Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Note 4 - Segment Reporting (Details) [Line Items]
Number of Reportable Segments					2
Revenues	$ 153,618		$ 141,822		$ 452,405		$ 413,587
Trucking [Member] | Operating Segments [Member] | Foreign Countries [Member]
Note 4 - Segment Reporting (Details) [Line Items]
Revenues	14,600		15,500		45,000		43,900
Trucking [Member] | Operating Segments [Member]
Note 4 - Segment Reporting (Details) [Line Items]
Revenues	$ 108,440	[1]	$ 104,944	[1]	$ 317,664	[1]	$ 311,761	[1]

[1] Includes foreign revenue of $14.6 million and $45.0 million for the three and nine months ended September 30, 2014, respectively, and, $15.5 million and $43.9 million for the three and nine months ended September 30, 2013, respectively.