Note 6 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2025

Notes Tables

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	Years ended December 31,
	2025		2024		2023
United States	$	772,284	$	742,432	$	929,054
Foreign		21,828		17,084		5,833
Income before income taxes	$	794,112	$	759,516	$	934,887

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

	Years ended December 31,
	2025			2024			2023
Current:
Federal	$	170,563		$	244,770		$	106,004
State and local		7,384			25,328			35,030
Foreign		5,827			8,380			-
		183,774			278,478			141,034
Deferred:
Federal		(2,541	)		(88,016	)		66,000
State and local		14,597			(1,832	)		(434	)
		12,056			(89,848	)		65,566
Total tax expense/(benefit)	$	195,830		$	188,630		$	206,600

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

	Years ended December 31,
	2025						2024						2023
	Amount			%			Amount			%			Amount			%
U.S. federal statutory rate	$	166,764			21.0	%	$	159,498			21.0	%	$	196,326			21.0	%
State tax, net of federal effect*		32,159			4.1			31,114			4.1			37,594			4.0
Foreign tax Effects		-			-			5,895			0.8			(1,002	)		(0.1	)
Tax credits		(10,043	)		(1.3	)		(1,754	)		(0.2	)		(3,829	)		(0.4	)
Nontaxable or nondeductible items:
Federal 1341 claim		18,090			2.3
Other		6,276			0.8			9,956			1.3			2,476			0.3
Changes in unrecognized tax benefits:		(17,547	)		(2.2	)		(12,648	)		(1.7	)		(21,968	)		(2.4	)
Other, net		131			-			(3,431	)		(0.5	)		(2,997	)		(0.3	)
Effective Tax Rate	$	195,830			24.7	%	$	188,630			24.8	%	$	206,600			22.1	%

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

	December 31,
	2025			2024
Deferred tax assets:
Insurance accruals	$	83,380		$	69,168
Allowance for doubtful accounts		12,149			12,584
Compensation accrual		15,881			9,882
Deferred compensation accrual		24,484			26,805
Federal benefit of state uncertain tax positions		16,377			17,693
Lease liabilities		60,849			74,858
State NOL carry-forward		2,602			4,235
Other		1,112			3,815
Total gross deferred tax assets		216,834			219,040
Valuation allowance		(2,602	)		(4,235	)
Total deferred tax assets, net of valuation allowance		214,232			214,805
Deferred tax liabilities:
Plant and equipment, principally due to differences in depreciation		1,031,019			1,001,537
Prepaid permits and insurance, principally due to expensing for income tax purposes		31,721			35,592
Lease right-of-use assets		59,797			73,925
Total gross deferred tax liabilities		1,122,537			1,111,054
Net deferred tax liability	$	908,305		$	896,249

Schedule of Cash Income Taxes Paid, Domestic and Foreign [Table Text Block]

	Years Ended December 31,
		2025		2024		2023
Federal		$	101,890	$	275,594	$	97,386
State and local:
California			1,903		2,068		7,037
Illinois			4,848		8,697		14,565
Other			9,099		14,289		14,549
Total State and local			15,850		25,054		36,151
Foreign			5,764		4,455		1,848
Income taxes, net of amounts refunded		$	123,504	$	305,103	$	135,385

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

	December 31,
	2025			2024			2023
Beginning balance	$	78.0		$	80.9		$	89.1
Additions based on tax positions related to the current year		11.5			13.3			16.2
Additions/(reductions) based on tax positions taken in prior years		(4.7	)		(2.9	)		0.5
Reductions due to settlements		(2.7	)		(1.4	)		(14.6	)
Reductions due to lapse of applicable statute of limitations		(14.4	)		(11.9	)		(10.3	)
Ending balance	$	67.7		$	78.0		$	80.9