Note 10 - Acquisitions (Details Textual) - USD ($) $ in Thousands		6 Months Ended
May. 04, 2015	Jun. 30, 2015	Jun. 30, 2014
Yancey Truck Centers LLC [Member] \| Goodwill Acquired [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Yancey Truck Centers LLC [Member]
Payments to Acquire Businesses, Gross	$ 30,100
Payments to Acquire Businesses, Gross		$ 57,906	$ 147,269

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration