Note 6 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

	Years ended December 31,
	2024			2023			2022
Current:
Federal	$	244,770		$	106,004		$	85,855
State and local		25,328			35,030			51,078
Foreign		8,380			-			-
		278,478			141,034			136,933
Deferred:
Federal		(88,016	)		66,000			172,334
State and local		(1,832	)		(434	)		2,755
		(89,848	)		65,566			175,089
Total tax expense/(benefit)	$	188,630		$	206,600		$	312,022

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

	Years ended December 31,
	2024		2023			2022
Income tax at federal statutory rate	$	159,498	$	196,326		$	269,088
State tax, net of federal effect		21,051		28,997			41,624
Federal 1341 Claim		-		(14,616	)		-
Other, net		8,081		(4,107	)		1,310
Total tax expense	$	188,630	$	206,600		$	312,022

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

	December 31,
	2024			2023
Deferred tax assets:
Insurance accruals	$	69,168		$	58,614
Allowance for doubtful accounts		12,584			10,766
Compensation accrual		9,882			8,003
Deferred compensation accrual		26,805			36,309
Federal benefit of state uncertain tax positions		17,693			17,491
Lease liabilities		74,858			82,048
State NOL carry-forward		4,235			5,478
Other		3,815			3,890
Total gross deferred tax assets		219,040			222,599
Valuation allowance		(4,235	)		(5,478	)
Total deferred tax assets, net of valuation allowance		214,805			217,121
Deferred tax liabilities:
Plant and equipment, principally due to differences in depreciation		1,001,537			1,057,922
Prepaid permits and insurance, principally due to expensing for income tax purposes		35,592			63,880
Lease right-of-use assets		73,925			81,416
Total gross deferred tax liabilities		1,111,054			1,203,218
Net deferred tax liability	$	896,249		$	986,097

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	December 31,
	2024			2023			2022
Beginning balance	$	80.9		$	89.1		$	78.5
Additions based on tax positions related to the current year		13.3			16.2			25.8
Additions/(reductions) based on tax positions taken in prior years		(2.9	)		0.5			2.8
Reductions due to settlements		(1.4	)		(14.6	)		(8.0	)
Reductions due to lapse of applicable statute of limitations		(11.9	)		(10.3	)		(10.0	)
Ending balance	$	78.0		$	80.9		$	89.1