Note 5 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

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

(In thousands)	2013		2012			2011
Current:
Federal	$	15,964	$	12,728		$	6,524
State		1,889		587			1,362
		17,853		13,315			7,886
Deferred:
Federal		3,909		5,542			9,837
State		394		(720	)		239
		4,303		4,822			10,076
Total provision	$	22,156	$	18,137		$	17,962

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

	2013			2012			2011
Statutory federal income tax rate		35	%		35	%		35	%
Per diem and other non-deductible expenses		4			5			6
Increase in taxes arising from state income taxes, net of federal income tax benefit		3			-			3
Other		-			-			(1	)
Effective tax rate		42	%		40	%		43	%

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

(In thousands)	2013		2012
Deferred tax assets:
Reserves and accrued liabilities	$	6,051	$	5,687
Other		2,796		2,714
		8,847		8,401
Deferred tax liabilities:
Depreciation		116,438		111,794
Prepaid expenses		2,631		2,526
		119,069		114,320
Net deferred tax liability	$	110,222	$	105,919