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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

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