Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Expense (Benefit)	$ 20,505	$ 22,675
Effective Income Tax Rate Reconciliation, Percent	29.50%	32.90%
Income Taxes Receivable	$ 23,900		$ 14,600
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Open Tax Year	2013
Domestic Tax Authority [Member] | California Franchise Tax Board [Member] | Earliest Tax Year [Member]
Open Tax Year	2012
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit)	$ (2,600)