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Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

		Years ended December 31,
		2018				2017				2016
Current:
Federal		$	22,904			$	134,284			$	191,422
State and local			26,738				23,456				21,871
			49,642				157,740				213,293
Deferred:
Federal			97,670				(261,592	)			45,846
State and local			3,921				12,828				4,568
			101,591				(248,764	)			50,414
Total tax expense/(benefit)		$	151,233			$	(91,024	)		$	263,707

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

		Years ended December 31,
		2018				2017				2016
Income tax at federal statutory rate		$	134,572			$	208,334			$	243,529
State tax, net of federal effect			24,627				18,334				19,165
Federal tax reform			(3,219	)			(309,223	)			-
Benefit of stock compensation			(4,919	)			(4,907	)			-
199/R&D credit			1,000				(7,056	)			-
Nondeductible meals and entertainment			1,071				1,374				1,419
Change in effective state tax rate, net of federal benefit			(1,469	)			3,403				(1,055	)
Other, net			(430	)			(1,283	)			649
Total tax expense		$	151,233			$	(91,024	)		$	263,707

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		December 31,
		2018				2017
Deferred tax assets:
Insurance accruals		$	34,889			$	27,700
Allowance for doubtful accounts			7,649				6,605
Compensation accrual			10,461				3,661
Deferred compensation accrual			20,396				17,620
Federal benefit of state uncertain tax positions			10,364				8,681
State NOL carry-forward			6,041				4,944
Other			4,626				3,134
Total gross deferred tax assets			94,426				72,345
Valuation allowance			(6,041	)			(4,944	)
Total deferred tax assets, net of valuation allowance			88,385				67,401
Deferred tax liabilities:
Plant and equipment, principally due to differences in depreciation			696,913				566,396
Prepaid permits and insurance, principally due to expensing for income tax purposes			33,594				28,089
Other			1,339				14,786
Total gross deferred tax liabilities			731,846				609,271
Net deferred tax liability		$	643,461			$	541,870

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

		December 31,
		2018				2017				2016
Beginning balance		$	45.3			$	35.4			$	32.0
Additions based on tax positions related to the current year			13.9				11.6				10.3
Additions/(reductions) based on tax positions taken in prior years			(2.4	)			5.4				(3.2	)
Reductions due to settlements			-				(2.4	)			(0.4	)
Reductions due to lapse of applicable statute of limitations			(4.6	)			(4.7	)			(3.3	)
Ending balance		$	52.2			$	45.3			$	35.4

X

- 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.

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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.

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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.

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