Note 6 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

(In thousands)	2019			2018			2017
Current:
Federal	$	(1,210	)	$	7,575		$	12,427
State		1,782			3,076			990
Total current		572			10,651			13,417
Deferred:
Federal		15,572			5,815			(48,424	)
State		473			(464	)		1,196
Total deferred		16,045			5,351			(47,228	)
Total expense (benefit)	$	16,617		$	16,002		$	(33,811	)

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

	2019			2018			2017
Federal statutory income tax rate		21	%		21	%		35	%
Increase in taxes arising from state income taxes, net of federal income tax benefit		2			3			3
Per diem and other non-deductible expenses		1			2			4
Decrease in federal deferred taxes due to decrease in statutory rate		—			—			(100	)
Federal tax credits		(2	)		(2	)		(1	)
Other, net		(1	)		(1	)		(1	)
Effective tax rate		21	%		23	%		(60	)%

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

(In thousands)	2019		2018
Deferred tax assets:
Reserves and accrued liabilities	$	9,050	$	7,986
Other		2,464		2,313
		11,514		10,299
Deferred tax liabilities:
Depreciation		130,686		113,773
Prepaid expenses		2,850		2,503
		133,536		116,276
Net deferred tax liability	$	122,022	$	105,977