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Note 5 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2014 | Oct. 31, 2013 | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk |  |  | $ 18,211 |  | $ 18,211 |  | $ 4,703
Commodity Contract [Member] |  |  |  |  |  |  |
Derivative, Number of Instruments Held, Total |  |  | 5 | 1 | 5 | 1 | 1
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Cost of Sales [Member] |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | $ (607) | $ 140 | $ (810) | $ 325 |
Commodity Contract [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivative, Remaining Maturity |  |  |  |  | 1 year 180 days |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |  |
Derivative, Number of Instruments Held, Total |  |  | 36 | 22 | 36 | 22 | 28
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other, Net [Member] |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | $ (124) | $ 447 | $ (442) | $ 626 |
Foreign Exchange Contract [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivative, Remaining Maturity |  |  |  |  | 1 year |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |
Number of New Contracts Entered | 1 | 2 |  |  |  |  | 20
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  | $ 1,626 | $ 581 | $ 10,403 | $ 1,345 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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