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Note 14 - Components of AOCI (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commodity Contract [Member] | Fuel Expense [Member]
(Losses) gains on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	$ (15,313)	$ (3,141)	$ 643
Commodity Contract [Member] | Income Tax Expense [Member]
(Losses) gains on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	5,865	1,206	(247)
Commodity Contract [Member]
(Losses) gains on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax	(9,448)	$ (1,935)	$ 396
Interest Rate Cap [Member] | Income Tax Expense [Member]
(Losses) gains on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	99
Interest Rate Cap [Member] | Interest Expense [Member]
(Losses) gains on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	(259)
Interest Rate Cap [Member]
(Losses) gains on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	$ (160)

X

- References

No definition available.

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- 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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- Definition

Amount after 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 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580

Reference 2: 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 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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