Note 10 - Acquisitions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Acquisition with Transauthority, Inc. [Member]
Note 10 - Acquisitions (Details) [Line Items]
Business Combination, Consideration Transferred	$ 41.7
Payments to Acquire Real Estate	11.1
Acquisition with Midwest Truck Sales [Member]
Note 10 - Acquisitions (Details) [Line Items]
Business Combination, Consideration Transferred	16.8
Payments to Acquire Real Estate	2.3
Acquisition with The Larson Group [Member]
Note 10 - Acquisitions (Details) [Line Items]
Business Combination, Consideration Transferred	1.2
Acquisition with Piedmont International Trucks, LLC [Member]
Note 10 - Acquisitions (Details) [Line Items]
Business Combination, Consideration Transferred	$ 3.5