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
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Open Tax Year	2012
Domestic Tax Authority [Member] | California Franchise Tax Board [Member] | Earliest Tax Year [Member]
Open Tax Year	2008
Income Tax Expense (Benefit)	$ 15,808	$ 12,098	$ 50,756	$ 43,200
Effective Income Tax Rate Reconciliation, Percent			28.50%	26.50%
Income Taxes Receivable					$ 28,900