Note 4 - Segment Reporting (Details) - Amortization and Depreciation by Reporting Segments (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Depreciation and Amortization
Depreciation and Amortization by Segments	$ 10,852	$ 11,178	$ 21,767	$ 22,335
Trucking [Member]
Depreciation and Amortization
Depreciation and Amortization by Segments	10,198	10,466	20,452	20,873
SCS and Intermodal [Member]
Depreciation and Amortization
Depreciation and Amortization by Segments	62	134	141	256
Corporate and Other [Member]
Depreciation and Amortization
Depreciation and Amortization by Segments	$ 592	$ 578	$ 1,174	$ 1,206