Note 14 - Segment Information (Details Textual) $ in Thousands	3 Months Ended	9 Months Ended
Aug. 27, 2016 USD ($)	Aug. 29, 2015 USD ($)	Aug. 27, 2016 USD ($)	Aug. 29, 2015 USD ($)
Zenith Freight Lines [Member]
Business Combination, Pro Forma Information Operating Costs of Acquiree Since Acquisition Date, Actual	$ 22,317	$ 22,850	$ 69,400	$ 49,517
Number of Reportable Segments			3

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration