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Note 13 - Merger with Revett (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 15, 2015 USD ($) shares | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 15, 2015 CAD / shares
Note 13 - Merger with Revett (Details) [Line Items] |  |  |  |
Share Price (in Dollars per share) | CAD / shares |  |  |  | CAD 3.06
Business Combination, Acquisition Related Costs |  | $ 15 | $ 2,162 |
Revett Mining Company, Inc. [Member] |  |  |  |
Note 13 - Merger with Revett (Details) [Line Items] |  |  |  |
Ownership Percentage | 100.00% |  |  |
Number of Properties | 2 |  |  |
Insurance Policy | $ 16,800 |  |  |
Revett Mining Company, Inc. [Member] |  |  |  |
Note 13 - Merger with Revett (Details) [Line Items] |  |  |  |
Business Combination, Consideration Transferred | 20,082 |  |  |
Payments to Acquire Businesses, Gross | 949 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | $ 19,100 |  |  |
Business Acquistion, Number of Common Stock Shares Exchanged for Each Share of Acquiree Common Stock (in Shares) | shares | 0.1622 |  |  |
Business Acquisition, Common Shares Outstanding of Acquiree (in Shares) | shares | 38,548,989 |  |  |
Business Acquisition, Shares Owned by Subsidary, Number of Shares Cancelled (in Shares) | shares | 725,000 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) | shares | 6,252,646 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ 19,052 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Reclamation Liability | 18,814 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reclamation Insurance Asset | 16,800 |  |  |
Business Combination, Acquisition Related Costs |  |  | 2,400 |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  | $ (1,700) |
Revett Mining Company, Inc. [Member] | Plant and Equipment [Member] |  |  |  |
Note 13 - Merger with Revett (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 4,100 |  |  |
Revett Mining Company, Inc. [Member] | Land [Member] |  |  |  |
Note 13 - Merger with Revett (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 4,600 |  |  |
Revett Mining Company, Inc. [Member] | Mineral Interests [Member] |  |  |  |
Note 13 - Merger with Revett (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ 10,300 |  |  |

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- Definition In a business acquisition, the number of shares owned by a subsidiary of the company that are cancelled as a result of the acquisition. + References No definition available. + Details
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- Definition In a business acquisition, the number of the company's shares of common stock exchanged for each share of the acquiree's common stock. + References No definition available. + Details
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