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Note 13 - Merger with Revett (Details) - Unaudited Pro Forma Financial Information - Revett Mining Company, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Note 13 - Merger with Revett (Details) - Unaudited Pro Forma Financial Information [Line Items] |  |  |  |
Sales of products | $ 104,941 | $ 135,507 | $ 330,366 | $ 378,802
Net income (loss) | (9,875) | 1,626 | (26,155) | (3,601)
Income (loss) applicable to common shareholders | $ (10,013) | $ 1,524 | $ (26,569) | $ (4,015)
Basic and diluted income (loss) per common share (in Dollars per share) | $ (0.03) | $ 0.00 | $ (0.07) | $ (0.01)

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