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Note 14 - Other Comprehensive Income ("OCI") - Components of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
(Losses) gains on cash flow hedges |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | $ (557) | $ (259) |
Commodity Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
(Losses) gains on cash flow hedges |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax | (10,255) | (9,448) | (1,935)
Commodity Contract [Member] | Fuel Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
(Losses) gains on cash flow hedges |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | (16,674) | (15,313) | (3,141)
Commodity Contract [Member] | Income Tax Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
(Losses) gains on cash flow hedges |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | 6,419 | 5,865 | $ 1,206
Interest Rate Cap [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
(Losses) gains on cash flow hedges |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | (342) | (160) |
Interest Rate Cap [Member] | Income Tax Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
(Losses) gains on cash flow hedges |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | $ 215 | $ 99 |

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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=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 + Details
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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=66004124&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=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 + Details
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