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Note 13 - Acquisition of Aurizon Mines Ltd. (Details) | 1 Months Ended | 6 Months Ended | 9 Months Ended |  |  | 1 Months Ended | 6 Months Ended
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Apr. 30, 2013 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2013 CAD | Sep. 30, 2013 USD ($) | Mar. 31, 2013 | Apr. 30, 2013 Asset Retirement Obligation [Member] USD ($) | Apr. 30, 2013 Plant and Equipment [Member] USD ($) | Apr. 30, 2013 Development and Other Mineral Interests [Member] USD ($) | Mar. 31, 2013 In The Money Stock Options [Member] | Sep. 30, 2013 Aurizon Mines Ltd [Member] USD ($) | Sep. 30, 2013 Aurizon Mines Ltd [Member] CAD
Note 13 - Acquisition of Aurizon Mines Ltd. (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Per Share Consideration (in Dollars per share and Dollars per share) |  | $ 3.83 |  | $ 3.83 |  |  |  |  |  | $ 4.32 | 4.47
Business Acquisition, Share Price (in Dollars per share) |  |  |  |  |  |  |  |  |  |  | 4.75
Business Acquisition Per Share Issued (in Shares) |  |  |  |  |  |  |  |  |  | 0.9953 | 0.9953
Potentail Business Acquisition Per Share Price (in Dollars per share) |  |  |  |  |  |  |  |  |  |  | 3.11
Business Acquisition Cost Sensitivity To Change In Share Price (in Dollars per share) |  | $ 3.00 |  |  |  |  |  |  |  |  |
Potentail Business Acquitision Shares Issued (in Shares) |  | 0.3442 | 0.3442 | 0.3442 |  |  |  |  |  |  |
Business Acquisition Shares Outstanding of Entity Acquired (in Shares) |  | 164,838,377 | 164,838,377 | 164,838,377 |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) |  | 56,997,790 | 56,997,790 |  |  |  |  |  | 747,132 |  |
Business Acquisition Shares Issued And Outstanding of Acquired Entity (in Shares) |  |  |  |  | 165,585,509 |  |  |  |  |  |
Payments to Acquire Businesses, Gross (in Dollars) |  | $ 496,400,000 | 514,500,000 | $ 496,211,000 |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 496,400,000 | 514,500,000 | 496,211,000 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable (in Dollars) |  | 218,300,000 | 226,300,000 | 218,302,000 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | 218,300,000 | 226,300,000 | 218,302,000 |  |  |  |  |  |  |
Business Combination, Consideration Transferred (in Dollars) |  | 714,500,000 | 740,800,000 | 714,513,000 |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | 714,500,000 | 740,800,000 | 714,513,000 |  |  |  |  |  |  |
Exchange Rate |  | 0.9645% | 0.9645% |  |  |  |  |  |  |  |
Share Price (in Dollars per share and Dollars per share) |  | $ 3.83 | 3.97 | $ 3.83 |  |  |  |  |  |  |
Proceeds from Notes Payable | 490,000,000 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ 715,400,000 | $ 715,391,000 |  | $ 715,391,000 |  | $ 11,100,000 | $ 127,800,000 | $ 576,500,000 |  |  |

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