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Note 6 - Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Note 6 - Derivative Instruments (Details) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 0.3
Derivative Liability, Fair Value, Gross Liability	0.3
Loss on Cash Flow Hedge Ineffectiveness	0.1
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 0.1
Fuel Requirements 2014 [Member] | Gallons of Diesel [Member]
Note 6 - Derivative Instruments (Details) [Line Items]
Derivative, Number of Instruments Held	10,200,000
Percent of Projected Fuel Requirements	24.80%
Fuel Requirements 2015 [Member] | Gallons of Diesel [Member]
Note 6 - Derivative Instruments (Details) [Line Items]
Derivative, Number of Instruments Held	9,500,000
Percent of Projected Fuel Requirements	17.30%

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Percentage of estimated annual fuel requirements hedged for the remainder of the period.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

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Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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The number of derivative instruments of a particular group held by the entity.

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The loss recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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