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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax | $ (2,784) | $ (10,597) | $ (9,608)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | (438) | (557) | (259)
Commodity Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax | (2,511) | (10,255) | (9,448)
Commodity Contract [Member] | Fuel Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | (4,065) | (16,674) | (15,313)
Commodity Contract [Member] | Income Tax Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | 1,554 | 6,419 | 5,865
Interest Rate Cap [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | (273) | (342) | (160)
Interest Rate Cap [Member] | Income Tax Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax | $ 165 | $ 215 | $ 99

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