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Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent |  |  | 26.40% | 30.10% |
Income Tax Expense (Benefit) | $ 15,431 | $ 12,273 | $ 35,936 | $ 34,948 |
Income Taxes Receivable | $ 19,400 |  | $ 19,400 |  | $ 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) |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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