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Note 9 - Quarterly Results for 2015, 2016 and 2017 (Unaudited) (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Expense (Benefit) | $ 5,000 |  | $ 9,760 | $ 5,260 | $ 5,830
Tax Adjustments, Settlements, and Unusual Provisions | $ 4,000 |  | $ 4,000 |  |
Reclassification from APIC to Income Tax Expense [Member] | Three Months Ended March 31, 2016 [Member] |  |  |  |  |
Prior Period Reclassification Adjustment |  | $ 200 |  |  |
Reclassification from APIC to Income Tax Expense [Member] | Three Months Ended June 30, 2016 [Member] |  |  |  |  |
Prior Period Reclassification Adjustment |  | 200 |  |  |
Reclassification from APIC to Income Tax Expense [Member] | Three Months Ended September 30, 2016 [Member] |  |  |  |  |
Prior Period Reclassification Adjustment |  | $ 100 |  |  |

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- Definition Amount 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 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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