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Note 4 - Derivative Instruments and Hedging Activities - Fair Value of Derivatives (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Commodity Contract [Member] |  |
Fair Value of Derivatives | $ 797 | $ 1,386
Foreign Exchange Contract [Member] |  |
Fair Value of Derivatives | (148) | (154)
Interest Rate Swap [Member] |  |
Fair Value of Derivatives | $ (9,476) | $ (29,536)

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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