Note 5 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

(In thousands)	201 6		2015		2014
Current:
Federal	$	8,987	$	9,280	$	10,402
State		1,125		946		2,015
		10,112		10,226		12,417
Deferred:
Federal		12,427		13,042		8,648
State		1,063		1,678		774
		13,490		14,720		9,422
Total provision	$	23,602	$	24,946	$	21,839

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

	201 6			2015			2014
Statutory federal income tax rate		35	%		35	%		35	%
Per diem and other non-deductible expenses		4			3			4
Increase in taxes arising from state income taxes, net of federal income tax benefit		2			3			3
Effective tax rate		41	%		41	%		42	%

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

(In thousands)	201 6		2015
Deferred tax assets:
Reserves and accrued liabilities	$	8,490	$	7,219
Other		2,757		2,721
		11,247		9,940
Deferred tax liabilities:
Depreciation		155,936		141,255
Prepaid expenses		3,165		3,049
		159,101		144,304
Net deferred tax liability	$	147,854	$	134,364