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Note 7 - Derivative Instruments - Impact From Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Derivatives | $ (164) | $ (2,842) | $ (884)
Interest Rate Swap [Member] | A B L Credit Facility [Member] |  |  |
Derivatives | (98) | (365) | (472)
Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member] |  |  |
Derivatives | (66) | (77) | (100)
Cash Flow Metals Hedges [Member] |  |  |
Derivatives |  | (2,400) | (312)
Metals Swap [Member] |  |  |
Derivatives | 68 | (2,304) | 934
Embedded Customer Derivatives [Member] |  |  |
Derivatives | $ (68) | $ 2,304 | $ (934)

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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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