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	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Note 13 - Merger with Revett (Details) - Unaudited Pro Forma Financial Information [Line Items]
Sales of products	$ 104,065	$ 117,502	$ 225,425	$ 243,295
Net income (loss)	(26,406)	(16,034)	(16,380)	(5,227)
Income (loss) applicable to common shareholders	$ (26,544)	$ (16,172)	$ (16,656)	$ (5,503)
Basic and diluted income (loss) per common share (in Dollars per share)	$ (0.07)	$ (0.05)	$ (0.05)	$ (0.02)

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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