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Note 15 - Acquisitions - Unaudited Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Mines Management [Member] |  |  |
Sales of products | $ 645,957 | $ 443,567 |
Net income (loss) | 68,778 | (89,806) |
Income (loss) applicable to common shareholders | $ 68,226 | $ (90,357) |
Basic and diluted income (loss) per common share (in dollars per share) | $ 0.17 | $ (0.24) |
Revett Mining Company, Inc. [Member] |  |  |
Sales of products |  |  | $ 445,703
Net income (loss) |  |  | (89,118)
Income (loss) applicable to common shareholders |  |  | $ (89,670)
Basic and diluted income (loss) per common share (in dollars per share) |  |  | $ (0.24)

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- Definition The pro forma basic and diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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- Definition The pro forma income (loss) applicable to common shareholders for the period as if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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