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Note 15 - Acquisitions (Details) - Unaudited Pro Forma Financial Information (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revett Mining Company Inc [Member] |  |  |
Note 15 - Acquisitions (Details) - Unaudited Pro Forma Financial Information (Parentheticals) [Line Items] |  |  |
Diluted income (loss) per common share | $ (0.24) | $ (0.12) | $ (0.11)
Aurizon Mines Ltd [Member] |  |  |
Note 15 - Acquisitions (Details) - Unaudited Pro Forma Financial Information (Parentheticals) [Line Items] |  |  |
Diluted income (loss) per common share |  |  | $ (0.03)

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- Definition The pro forma 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 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 + Details
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