Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Expense (Benefit)	$ 5,585	$ 5,615	$ 15,943	$ 16,171
Effective Income Tax Rate Reconciliation, Percent	31.80%	31.20%	32.40%	31.90%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Unrecognized Tax Benefits	$ 3,800		$ 3,800		$ 2,800