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Note 10 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net Gain (Loss) Recognized | $ (1,520) | $ (227) | $ (5)
Interest Rate Swap [Member] |  |  |
Net Gain (Loss) Recognized | (1,520) | (227) | 0
Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member] |  |  |
Net Gain (Loss) Recognized | 0 | 0 | (5)
Metal Swaps [Member] |  |  |
Net Gain (Loss) Recognized | 55 | 291 | (79)
Embedded Customer Derivatives [Member] |  |  |
Net Gain (Loss) Recognized | $ (55) | $ (291) | $ 79

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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