Note 7 - Debt (Detail) - Current and Long-term Debt (Parentheticals)	9 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Revenue Equipment Installment Notes [Member]
Interest rate	5.40%	5.70%
Interest rate	5.40%	5.70%
Maturity date	October 2012 to March 2017	October 2012 to March 2017
Maturity date	October 2012 to March 2017	October 2012 to March 2017
Real Estate Note [Member]
Interest rate	2.70%	2.80%
Interest rate	2.70%	2.80%
Maturity date	October 2013	October 2013
Maturity date	October 2013	October 2013
Other Note Payable [Member]
Interest rate	3.00%	3.00%
Interest rate	3.00%	3.00%
Maturity date	November 2016	November 2016
Maturity date	November 2016	November 2016

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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)(2))

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration