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Note 11 - Other Comprehensive Income ("OCI") - Components of OCI (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Commodity Contract [Member] | Fuel Expense [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	$ 4,009	$ 13,125
Commodity Contract [Member] | Income Tax Expense [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	(1,543)	(5,053)
Commodity Contract [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax	2,466	8,072
Interest Rate Cap [Member] | Interest Expense [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	136	421
Interest Rate Cap [Member] | Income Tax Benefit [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	(53)	(162)
Interest Rate Cap [Member]
Losses on cash flow hedges
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	$ 83	$ 259

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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=64837297&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=66004124&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=66004124&loc=d3e637-108580

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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=66004124&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph c
-URI http://asc.fasb.org/extlink&oid=64837297&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=66004124&loc=d3e637-108580

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