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Note 11 - Other Comprehensive Income (Loss) ("OCI") (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
Details about OCI Components |  | Amount Reclassified from OCI for the three months ended September 30, 201 8 |  |  | Amount Reclassified from OCI for the nine months ended September 30, 201 8 |  | Affected Line Item in the Statement of Operations
Losses (gains) on cash flow hedges |  |  |  |  |  |  |  |  |
Commodity derivative contracts |  | $ | (580 | ) |  | $ | (1,312 | ) | Fuel expense
|  |  | 160 |  |  |  | 361 |  | Income tax expense
|  | $ | (420 | ) |  | $ | (951 | ) | Net of tax
Interest rate swap contract |  | $ | 19 |  |  | $ | 114 |  | Interest expense
|  |  | (5 | ) |  |  | (31 | ) | Income tax benefit
|  | $ | 14 |  |  | $ | 83 |  | Net of tax

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