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Note 9 - Quarterly Results for 2018, 2017, and 2016 (Unaudited) (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expense (Benefit), Total | $ 5,000 |  |  |  | $ 4,420 | $ 9,760 | $ 5,260
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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28511-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28446-109314 + Details
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