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Note 15 - Acquisitions - Preliminary Purchase Price Allocation (Details) (Parentheticals) - $ / shares | Sep. 13, 2016 | Jun. 15, 2015
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Mines Management [Member] |  |
Stock Issued, shares (in shares) | 8,309,006 |
Stock Issued, per share (in dollars per share) | $ 5.79 |
Revett Mining Company, Inc. [Member] |  |
Stock Issued, shares (in shares) |  | 6,252,646
Stock Issued, per share (in dollars per share) |  | $ 3.06

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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