Note 5 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

(In thousands)	2020			2019			2018
Current:
Federal	$	21,312		$	(1,210	)	$	7,575
State		3,498			1,782			3,076
Total current		24,810			572			10,651
Deferred:
Federal		(1,557	)		15,572			5,815
State		633			473			(464	)
Total deferred		(924	)		16,045			5,351
Total expense (benefit)	$	23,886		$	16,617		$	16,002

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

	2020			2019			2018
Federal statutory income tax rate		21	%		21	%		21	%
Increase in taxes arising from state income taxes, net of federal income tax benefit		4			2			3
Per diem and other non-deductible expenses		1			1			2
Federal tax credits		(1	)		(2	)		(2	)
Other, net		1			(1	)		(1	)
Effective tax rate		26	%		21	%		23	%

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

(In thousands)	2020		2019
Deferred tax assets:
Reserves and accrued liabilities	$	12,050	$	9,050
Other		1,768		2,464
		13,818		11,514
Deferred tax liabilities:
Depreciation		131,650		130,686
Prepaid expenses		3,266		2,850
		134,916		133,536
Net deferred tax liability	$	121,098	$	122,022