Note 10 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income tax expense	$ 4,118	$ 8,608	$ 16,186	$ 10,343
Effective Income Tax Rate Reconciliation, Percent	38.40%	38.20%	40.00%	38.10%