Note 7 - Debt (Details) - Current and Long-term Debt (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Note 7 - Debt (Details) - Current and Long-term Debt [Line Items]
Borrowings under Credit Facility	$ 0us-gaap_LinesOfCreditCurrent	$ 0us-gaap_LinesOfCreditCurrent
Notes payable, current	23,482us-gaap_LongTermDebtCurrent	27,824us-gaap_LongTermDebtCurrent
Notes payable, long-term	131,079us-gaap_LongTermDebtNoncurrent	159,531us-gaap_LongTermDebtNoncurrent
Principal portion of capital lease obligations, secured by related revenue equipment	1,723us-gaap_CapitalLeaseObligationsCurrent	1,606us-gaap_CapitalLeaseObligationsCurrent
Principal portion of capital lease obligations, secured by related revenue equipment	14,142	13,372
Total debt and capital lease obligations	25,205	29,430
Total debt and capital lease obligations	145,221	172,903
Revenue Equipment Installment Notes [Member]
Note 7 - Debt (Details) - Current and Long-term Debt [Line Items]
Notes payable, current	23,222	27,550
Notes payable, long-term	127,433	155,832
Real Estate Note [Member]
Note 7 - Debt (Details) - Current and Long-term Debt [Line Items]
Notes payable, current	152	166
Notes payable, long-term	3,580	3,608
Other Note Payable [Member]
Note 7 - Debt (Details) - Current and Long-term Debt [Line Items]
Notes payable, current	108	108
Notes payable, long-term	$ 66	$ 91

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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-URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SX 210.5-02.22)

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