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Note 7 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Years ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 191,422 |  |  | $ | 160,235 |  |  | $ | 130,761 |
State and local |  |  | 21,871 |  |  |  | 22,306 |  |  |  | 19,705 |
|  |  | 213,293 |  |  |  | 182,541 |  |  |  | 150,466 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 45,846 |  |  |  | 71,292 |  |  |  | 72,547 |
State and local |  |  | 4,568 |  |  |  | 9,135 |  |  |  | 6,796 |
|  |  | 50,414 |  |  |  | 80,427 |  |  |  | 79,343 |
Total tax expense |  | $ | 263,707 |  |  | $ | 262,968 |  |  | $ | 229,809 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Years ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Income tax at federal statutory rate |  | $ | 243,529 |  |  | $ | 241,571 |  |  | $ | 211,610 |
State tax, net of federal effect |  |  | 19,165 |  |  |  | 18,671 |  |  |  | 17,357 |
Nondeductible meals and entertainment |  |  | 1,419 |  |  |  | 1,420 |  |  |  | 1,395 |
Change in effective state tax rate, net of federal benefit |  |  | (1,055 | ) |  |  | 1,761 |  |  |  | 256 |
Other, net |  |  | 649 |  |  |  | (455 | ) |  |  | (809 | )
Total tax expense |  | $ | 263,707 |  |  | $ | 262,968 |  |  | $ | 229,809 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
|  | 2016 |  |  | 2015 |
Deferred tax assets: |  |  |  |  |  |  |  |
Insurance accruals |  | $ | 34,788 |  |  | $ | 33,522 |
Allowance for doubtful accounts |  |  | 2,347 |  |  |  | 2,335 |
Compensation accrual |  |  | 10,443 |  |  |  | 13,991 |
Deferred compensation accrual |  |  | 26,062 |  |  |  | 24,687 |
Federal benefit of state uncertain tax positions |  |  | 14,085 |  |  |  | 12,751 |
Other |  |  | 3,853 |  |  |  | 4,036 |
Total gross deferred tax assets |  |  | 91,578 |  |  |  | 91,322 |
Valuation allowance |  |  | - |  |  |  | (552 | )
Total deferred tax assets, net of valuation allowance |  |  | 91,578 |  |  |  | 90,770 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Plant and equipment, principally due to differences in depreciation |  |  | 831,555 |  |  |  | 786,840 |
Prepaid permits and insurance, principally due to expensing for income tax purposes |  |  | 37,119 |  |  |  | 33,064 |
Other |  |  | 13,538 |  |  |  | 11,086 |
Total gross deferred tax liabilities |  |  | 882,212 |  |  |  | 830,990 |
Net deferred tax liability |  | $ | 790,634 |  |  | $ | 740,220 |
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] |
|  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Beginning balance |  | $ | 32.0 |  |  | $ | 31.6 |  |  | $ | 29.7 |
Additions based on tax positions related to the current year |  |  | 10.3 |  |  |  | 9.4 |  |  |  | 8.2 |
Additions/(reductions) based on tax positions taken in prior years |  |  | (3.2 | ) |  |  | (2.5 | ) |  |  | 0.4 |
Reductions due to settlements |  |  | (0.4 | ) |  |  | (3.0 | ) |  |  | (3.7 | )
Reductions due to lapse of applicable statute of limitations |  |  | (3.3 | ) |  |  | (3.5 | ) |  |  | (3.0 | )
Ending balance |  | $ | 35.4 |  |  | $ | 32.0 |  |  | $ | 31.6 |

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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=65882285&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=65882285&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=65882285&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination. + References Reference 1: 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=65882285&loc=d3e32718-109319 + Details
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