Note 9 - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income tax expense	$ 11,897	$ 8,128	$ 18,312	$ 12,068
Effective Income Tax Rate Reconciliation, Percent	40.20%	40.20%	40.70%	40.50%