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Note 11 - Components of AOCI (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Fuel Hedge Contracts [Member] | Fuel Expense [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	$ 4,200	$ 10,669
Fuel Hedge Contracts [Member] | Income Tax Expense [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(1,609)	(4,086)
Fuel Hedge Contracts [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	2,591	6,583
Interest Rate Swap [Member] | Income Tax Expense [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(38)	(38)
Interest Rate Swap [Member] | Interest Expense [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	99	99
Interest Rate Swap [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	$ 61	$ 61

X

- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4



-Subparagraph c



-URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 220



-SubTopic 10



-Section 45



-Paragraph 15



-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 220



-SubTopic 10



-Section 45



-Paragraph 11



-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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