Note 9 - Income Taxes (Details) - Reconciliation of Income Tax Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reconciliation of Income Tax Expense [Abstract]
Income tax expense	$ 8,608	$ 4,491	$ 10,343	$ 9,715
Effective income tax rate	38.20%	38.80%	38.10%	42.60%