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Note 7 - Debt (Detail) - Current and Long-term Debt (Parentheticals)	Dec. 31, 2012	Dec. 31, 2011
Revenue Equipment Installment Notes [Member]
Interest rate on notes payable, current	5.20%	5.70%
Interest rate on notes payable, long-term	5.20%	5.70%
Real Estate Note [Member]
Interest rate on notes payable, current	2.70%	2.80%
Interest rate on notes payable, long-term	2.70%	2.80%
Other Note Payable [Member]
Interest rate on notes payable, current	3.00%	3.00%
Interest rate on notes payable, long-term	3.00%	3.00%

X

- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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 210.5-02.22(a)(1))

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

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant