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Note 13 - Acquisitions - Unaudited Proforma Financial Information (Details) - Mines Management [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Sales of products | $ 179,393 | $ 104,941 | $ 481,712 | $ 328,230
Net income (loss) | 26,322 | (10,934) | 47,988 | (27,799)
Income (loss) applicable to common shareholders | $ 26,184 | $ (11,071) | $ 47,574 | $ (28,213)
Basic and diluted income (loss) per common share (in dollars per share) | $ 0.07 | $ (0.03) | $ 0.12 | $ (0.07)

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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=65885119&loc=d3e1392-128463 + Details
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