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Note 9 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
(in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Federal, current |  | $ | (7,780 | ) |  | $ | 11,951 |  |  | $ | 124 |
Federal, deferred |  |  | (28,055 | ) |  |  | (2,925 | ) |  |  | 18,185 |
State, current |  |  | (1,737 | ) |  |  | 1,811 |  |  |  | 426 |
State, deferred |  |  | 5,430 |  |  |  | (451 | ) |  |  | 3,087 |
Actual income tax expense |  | $ | (32,142 | ) |  | $ | 10,386 |  |  | $ | 21,822 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
(in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Computed "expected" income tax expense |  | $ | 8,154 |  |  | $ | 9,527 |  |  | $ | 22,368 |
State income taxes, net of federal income tax effect |  |  | 862 |  |  |  | 953 |  |  |  | 2,237 |
Per diem allowances |  |  | 2,145 |  |  |  | 2,205 |  |  |  | 2,329 |
Tax contingency accruals |  |  | (43 | ) |  |  | (273 | ) |  |  | 1,599 |
Valuation allowance, net |  |  | (1,167 | ) |  |  | - |  |  |  | 218 |
Tax credits |  |  | (1,084 | ) |  |  | (694 | ) |  |  | (7,151 | )
Impact of Tax Cuts and Jobs Act remeasurement |  |  | (40,123 | ) |  |  | - |  |  |  | - |
Excess tax benefits on share-based compensation |  |  | (457 | ) |  |  | - |  |  |  | - |
Other, net |  |  | (429 | ) |  |  | (1,332 | ) |  |  | 222 |
Actual income tax expense |  | $ | (32,142 | ) |  | $ | 10,386 |  |  | $ | 21,822 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
(in thousands) |  | 2017 |  |  | 2016 |
Deferred tax assets: |  |  |  |  |  |  |  |
Insurance and claims |  | $ | 8,797 |  |  | $ | 15,147 |
Net operating loss carryovers |  |  | 4,755 |  |  |  | 3,326 |
Tax credits |  |  | 11,875 |  |  |  | 6,409 |
Other |  |  | 4,414 |  |  |  | 5,113 |
Deferred fuel hedge |  |  | - |  |  |  | 1,653 |
Valuation allowance |  |  | (63 | ) |  |  | (1,219 | )
Total deferred tax assets |  |  | 29,778 |  |  |  | 30,429 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Property and equipment |  |  | (76,325 | ) |  |  | (98,679 | )
Investment in partnership |  |  | (14,197 | ) |  |  | (9,730 | )
Deferred fuel hedge |  |  | (99 | ) |  |  | - |
Other |  |  | - |  |  |  | (1,391 | )
Prepaid expenses |  |  | (2,501 | ) |  |  | (4,786 | )
Total net deferred tax liabilities |  |  | (93,122 | ) |  |  | (114,586 | )
Net deferred tax liability |  | $ | (63,344 | ) |  | $ | (84,157 | )
Summary of Income Tax Contingencies [Table Text Block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Balance as of January 1, |  | $ | 2,051 |  |  | $ | 2,394 |  |  | $ | 995 |
Increases related to prior year tax positions |  |  | 19 |  |  |  | - |  |  |  | 1,737 |
Decreases related to prior year positions |  |  | (10 | ) |  |  | - |  |  |  | - |
Increases related to current year tax positions |  |  | - |  |  |  | - |  |  |  | - |
Decreases related to settlements with taxing authorities |  |  | - |  |  |  | (88 | ) |  |  | (182 | )
Decreases related to lapsing of statute of limitations |  |  | (136 | ) |  |  | (255 | ) |  |  | (156 | )
Balance as of December 31, |  | $ | 1,924 |  |  | $ | 2,051 |  |  | $ | 2,394 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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