Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Expense (Benefit)	$ 5,330	$ 2,537	$ 18,569	$ (6,424)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		$ (824)		(15,183)
Effective Income Tax Rate Reconciliation, Percent	31.00%		31.90%
Business Combination, Step Acquisition Net Gain (Loss) on Acquiring Remaining Interest				$ (4,122)
Pro Forma Effective Income Tax Rate, Continuing Operations		29.40%		31.80%