Note 5 - Accounts Receivable (Details) - Activity in Allowance for Doubtful Accounts (USD $) In Thousands, unless otherwise specified	3 Months Ended
Feb. 28, 2015
Note 5 - Accounts Receivable (Details) - Activity in Allowance for Doubtful Accounts [Line Items]
Balance at November 29, 2014	$ 1,249
Reductions to allowance	(55)
Balance at February 28, 2015	1,403
Zenith Freight Lines [Member]
Note 5 - Accounts Receivable (Details) - Activity in Allowance for Doubtful Accounts [Line Items]
Acquired allowance on accounts receivable (Note 3)	$ 209

Amount of direct write-downs of accounts receivable charged against the allowance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 954

-SubTopic 310

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35755819&loc=SL9156395-115594

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration