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Note 13 - 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] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 201 5 |
Current provision- |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 22,443 |  |  | $ | 15,236 |  |  | $ | 7,513 |
State |  |  | 4,030 |  |  |  | 2,300 |  |  |  | 2,592 |
|  |  | 26,473 |  |  |  | 17,536 |  |  |  | 10,105 |
Deferred provision- |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (64,821 | ) |  |  | 8,260 |  |  |  | 29,561 |
State |  |  | 2,618 |  |  |  | 71 |  |  |  | 2,084 |
|  |  | (62,203 | ) |  |  | 8,331 |  |  |  | 31,645 |
Provision (benefit) for income taxes |  | $ | (35,730 | ) |  | $ | 25,867 |  |  | $ | 41,750 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 20 16 |  |  | 2015 |
Income taxes at the federal statutory rate |  | $ | 47,749 |  |  | $ | 23,255 |  |  | $ | 37,733 |
State income taxes, net of federal benefit |  |  | 3,246 |  |  |  | 1,552 |  |  |  | 3,053 |
Tax effect of permanent differences |  |  | (4,097 | ) |  |  | 887 |  |  |  | 959 |
Revaluation of deferred taxes |  |  | (82,862 | ) |  |  | − |  |  |  | − |
Other, net |  |  | 234 |  |  |  | 173 |  |  |  | 5 |
(B enefit) provision for income taxes |  | $ | (35,730 | ) |  | $ | 25,867 |  |  | $ | 41,750 |
Schedule of Income Taxes Related to Other Comprehensive Income [Table Text Block] |
|  | Year Ended December 31, |
|  | 201 7 |  |  | 2016 |  |  | 201 5 |
Income tax expense (benefit) related to components of other comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of cash flow swaps |  | $ | − |  |  | $ | − |  |  | $ | 92 |
Change in fair value of available-for-sale securities |  |  | 183 |  |  |  | 13 |  |  |  | 7 |
Total |  | $ | 183 |  |  | $ | 13 |  |  | $ | 99 |
Paid in capital – stock based compensation |  | $ | − |  |  | $ | 294 |  |  | $ | 337 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
|  | 201 7 |  |  | 201 6 |
Deferred income tax (assets) liabilities: |  |  |  |  |  |  |  |
Inventory |  | $ | (3,637 | ) |  | $ | (5,074 | )
Accounts receivable |  |  | (157 | ) |  |  | (203 | )
Capital lease obligations |  |  | (19,480 | ) |  |  | (31,263 | )
Stock options |  |  | (6,899 | ) |  |  | (11,655 | )
Accrued liabilities |  |  | (2,533 | ) |  |  | (3,610 | )
State net operating loss carry forward |  |  | (2,262 | ) |  |  | (1,921 | )
State tax credit |  |  | (410 | ) |  |  | (380 | )
Other |  |  | (3,627 | ) |  |  | (5,170 | )
Difference between book and tax basis- Depreciation and amortization |  |  | 174,266 |  |  |  | 256,352 |
|  |  | 135,261 |  |  |  | 197,076 |
Valuation allowance |  |  | 50 |  |  |  | 255 |
Net deferred income tax liability |  | $ | 135,311 |  |  | $ | 197,331 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Unrecognized tax benefits at beginning of period |  | $ | 2,401 |  |  | $ | 2,332 |  |  | $ | 2,087 |
Gross increases – tax positions in current year |  |  | 619 |  |  |  | 429 |  |  |  | 692 |
Gross increases – tax positions in a prior year |  |  |  |  |  |  |  |  |  |  | − |
Reductions due to lapse of statute of limitations |  |  | (465 | ) |  |  | (360 | ) |  |  | (447 | )
Unrecognized tax benefits at end of period |  | $ | 2,555 |  |  | $ | 2,401 |  |  | $ | 2,332 |

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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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