Note 5 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

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

(In thousands)	201 5		2014		2013
Current:
Federal	$	9,280	$	10,402	$	15,964
State		946		2,015		1,889
		10,226		12,417		17,853
Deferred:
Federal		13,042		8,648		3,909
State		1,678		774		394
		14,720		9,422		4,303
Total provision	$	24,946	$	21,839	$	22,156

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

	2015			2014			2013
Statutory federal income tax rate		35	%		35	%		35	%
Per diem and other non-deductible expenses		3			4			4
Increase in taxes arising from state income taxes, net of federal income tax benefit		3			3			3
Effective tax rate		41	%		42	%		42	%

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

(In thousands)	201 5		2014
Deferred tax assets:
Reserves and accrued liabilities	$	7,219	$	6,049
Other		2,721		2,847
		9,940		8,896
Deferred tax liabilities:
Depreciation		141,255		125,697
Prepaid expenses		3,049		2,843
		144,304		128,540
Net deferred tax liability	$	134,364	$	119,644