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Note 12 - Other Comprehensive Income ("OCI") (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
|  | Amount Reclassified from OCI for the years ended |  |
Details about OCI Components |  | December 31, |  | Affected Line Item in the Statement of Operations
|  | 2018 |  |  | 2017 |  |  | 2016 |  |
Gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts |  | $ | 1,600 |  |  | $ | (4,065 | ) |  | $ | (16,674 | ) | Fuel expense
|  |  | (440 | ) |  |  | 1,554 |  |  |  | 6,419 |  | Income tax expense
|  | $ | 1,160 |  |  | $ | (2,511 | ) |  | $ | (10,255 | ) | Net of tax
Interest rate swap contracts |  | $ | (115 | ) |  | $ | (438 | ) |  | $ | (557 | ) | Interest expense
|  |  | 32 |  |  |  | 165 |  |  |  | 215 |  | Income tax expense
|  | $ | (83 | ) |  | $ | (273 | ) |  | $ | (342 | ) | Net of tax

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