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
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)

The pro forma net Income or Loss applicable to common shareholders for the period as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

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- References

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- Definition

The pro forma basic net income per share for a 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=56956515&loc=d3e1392-128463

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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.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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