Note 8 - Leases and Commitments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Note 8 - Leases and Commitments (Details) [Line Items]
Capital Lease Obligations	$ 38.0us-gaap_CapitalLeaseObligations
Capital Lease Obligations, Current	19.1us-gaap_CapitalLeaseObligationsCurrent
Capital Leases, Income Statement, Amortization Expense	2.7	3.4
Operating Leases, Rent Expense	1.3us-gaap_LeaseAndRentalExpense	1.3us-gaap_LeaseAndRentalExpense
IT Related Hardware [Member] \| Capital Lease Obligations [Member]
Note 8 - Leases and Commitments (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	3.10%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	4.50%
IT Related Hardware [Member]
Note 8 - Leases and Commitments (Details) [Line Items]
Purchase Obligation	0.1
Non-Revenue Equipment [Member]
Note 8 - Leases and Commitments (Details) [Line Items]
Purchase Obligation	0
Revenue Equipment [Member]
Note 8 - Leases and Commitments (Details) [Line Items]
Purchase Obligation	$ 36.7
Minimum [Member] \| Capital Lease Obligations [Member]
Note 8 - Leases and Commitments (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	1.60%
Maximum [Member] \| Capital Lease Obligations [Member]
Note 8 - Leases and Commitments (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	3.10%

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

-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

+ Details

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- Definition

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)

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

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

-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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 45

-Paragraph 2

-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

+ Details

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- Definition

The charge for the use of long-lived depreciable capital leased assets for the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45031-112735

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 840

-Section 55

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6501752&loc=d3e56872-110439

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- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

+ References

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

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