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Note 14 - Other Comprehensive Income ("OCI") (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
Details about OCI Components |  | Amoun t Reclassified from OCI for the years ended December 31, |  | Affected Line Item in the Statement of Operations
|  | 201 7 |  |  | 2016 |  |  | 2015 |  |
(Losses) gains on cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts |  | $ | (4,065 | ) |  | $ | (16,674 | ) |  | $ | (15,313 | ) | Fuel expense
|  |  | 1,554 |  |  |  | 6,419 |  |  |  | 5,865 |  | Income tax expense
|  | $ | (2,511 | ) |  | $ | (10,255 | ) |  | $ | (9,448 | ) | Net of tax
Interest rate swap contracts |  | $ | (438 | ) |  | $ | (557 | ) |  | $ | (259 | ) | Interest expense
|  |  | 165 |  |  |  | 215 |  |  |  | 99 |  | Income tax expense
|  | $ | (273 | ) |  | $ | (342 | ) |  | $ | (160 | ) | Net of tax

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