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Note 6 - Derivative Instruments (Detail) (USD $)	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013 Scenario, Forecast [Member]	Dec. 31, 2012 Gallons for Remainder of 2012 [Member]
Derivative, Number of Instruments Held				1,000,000	12,100,000		1,000,000
Percent of Projected Fuel Requirements	10.00%			2.00%	20.00%
Derivative Liability, Fair Value, Net (in Dollars)		$ 1,100,000	$ 1,100,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (in Dollars)		700,000	2,200,000
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net (in Dollars)		200,000	0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (in Dollars)						$ 1,100,000

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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X

- Definition

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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

-Publisher FASB

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-Paragraph 205G

-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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X

- Definition

Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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X

- Definition

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

+ References

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X

- Definition

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

+ References

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