Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Percent	33.50%	37.30%	33.40%	37.10%
Income Tax Expense (Benefit)	$ 13,545	$ 11,884	$ 18,255	$ 16,790
Deferred Tax Assets, Net	$ 89,200		$ 89,200		$ 99,100