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Note 16 - Restructuring (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Costs | $ 1,966 | $ 1,664 |  | $ 4,970 | $ 2,058
Minimum [Member] | Scenario, Forecast [Member] |  |  |  |  |
Restructuring Costs |  |  | $ 4,000 |  |
Maximum [Member] | Scenario, Forecast [Member] |  |  |  |  |
Restructuring Costs |  |  | $ 5,000 |  |
Severance and Non-cash Lease Impairment Costs [Member] |  |  |  |  |
Restructuring Costs | $ 1,700 |  |  | $ 5,000 | $ 2,100

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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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