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Note 15 - Acquisitions (Details) CAD / shares in Units, $ / shares in Units, $ in Thousands, CAD in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 15, 2015 USD ($) $ / shares shares | Aug. 23, 2013 USD ($) $ / shares | Jun. 02, 2013 USD ($) $ / shares shares | Jun. 02, 2013 CAD shares | Apr. 30, 2013 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jun. 30, 2015 USD ($) | Jun. 15, 2015 CAD / shares | Jun. 02, 2013 CAD / shares shares
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  | $ 714,500 | CAD 740.8 |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 496,200 | CAD 514.5 |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) | shares | 6,252,646 |  | 56,997,790 | 56,997,790 |  |  |  |  |  |  |
Share Price | (per share) |  |  | $ 3.83 |  |  |  |  |  |  | CAD 3.06 | CAD 3.97
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  | $ 715,400 |  |  |  |
Insurance Policy |  |  |  |  |  |  |  |  | $ 16,800 |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 2,162 |  | $ 26,397 |  |  |
Business Acquisition Cost Sensitivity to Change in Share Price (in Dollars per share) | $ / shares |  |  | $ 3.00 |  |  |  |  |  |  |  |
Potential Business Acquitision Shares Issued (in Shares) | shares |  |  | 0.3442 |  |  |  |  |  |  |  | 0.3442
Business Acquisition Shares Outstanding of Entity Acquired (in Shares) | shares |  |  | 164,838,377 |  |  |  |  |  |  |  | 164,838,377
Business Acquisition Shares Issued and Outstanding of Acquired Entity (in Shares) | shares |  |  | 165,585,509 | 165,585,509 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  | $ 218,300 | CAD 226.3 |  |  |  |  |  |  |
Exchange Rate |  |  | 0.9645 | 0.9645 |  |  |  |  |  |  |
Proceeds from Notes Payable |  |  |  |  | $ 490,000 |  |  |  |  |  |
Revett Mining Company Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage | 100.00% |  |  |  |  |  |  |  |  |  |
Number of Properties | 2 |  |  |  |  |  |  |  |  |  |
Insurance Policy | $ 16,800 |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  | 54,700 |  |  |  |
In the Money Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) | shares |  |  | 747,132 | 747,132 |  |  |  |  |  |  |
Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  | 127,800 |  |  |  |
Asset Retirement Obligation [Member] |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  | 11,100 |  |  |  |
Development and Other Mineral Interests [Member] |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  | $ 576,500 |  |  |  |
Revett Mining Company Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (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 Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ 17,609 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Reclamation Liability | 17,513 |  |  |  |  |  |  |  | 17,500 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed Reclamation Insurance Asset | $ 16,800 |  |  |  |  |  |  |  | $ 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 |  |  |  |  |
Business Acquisition Per Share Consideration | $ / shares | $ 3.06 |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 19,133 |  |  |  |  |  |  |  |  |  |
Revett Mining Company Inc [Member] | Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (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 15 - Acquisitions (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 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ 8,900 |  |  |  |  |  |  |  |  |  |
Aurizon Mines Ltd [Member] |  |  |  |  |  |  |  |  |  |  |
Note 15 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 714,513 |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 496,211 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 715,391 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Reclamation Liability |  | $ 11,113 |  |  |  |  |  |  |  |  |
Business Acquisition Per Share Consideration | (per share) |  | $ 3.83 | $ 4.32 |  |  |  |  |  |  |  | CAD 4.47
Business Acquisition, Share Price (in Dollars per share) | CAD / shares |  |  |  |  |  |  |  |  |  |  | 4.75
Business Acquisition Per Share Issued (in Shares) | shares |  |  | 0.9953 | 0.9953 |  |  |  |  |  |  |
Potential Business Acquisition Per Share Price (in Dollars per share) | CAD / shares |  |  |  |  |  |  |  |  |  |  | CAD 3.11
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | $ 218,302 |  |  |  |  |  |  |  |  |

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