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Note 13 - Acquisition of Aurizon Mines Ltd. (Details) - Preliminary Purchase Price Allocation | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2013 USD ($) | Jun. 30, 2013 CAD | Jun. 30, 2013 USD ($) | Apr. 30, 2013 USD ($) | Jun. 30, 2013 Accrued Payroll and Related Benefits [Member] USD ($) | Jun. 30, 2013 Accrued Taxes [Member] USD ($) | Jun. 30, 2013 Non-current Deferred Tax Liability [Member] USD ($) | Jun. 30, 2013 Non-current Reclamation [Member] USD ($) | Jun. 30, 2013 Other Non-current Liabilities [Member] USD ($) | Jun. 30, 2013 Bullion and Stockpiled Ore [Member] USD ($) | Jun. 30, 2013 Supplies [Member] USD ($)
Consideration: |  |  |  |  |  |  |  |  |  |  |
Cash payments | $ 496,400,000 | 514,500,000 | $ 496,211,000 |  |  |  |  |  |  |  |
Hecla stock issued (56,997,790 shares at $3.83 per share) | 218,300,000 | 226,300,000 | 218,302,000 |  |  |  |  |  |  |  |
Total consideration |  | 740,800,000 | 714,513,000 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Cash | 177,587,000 |  | 177,587,000 |  |  |  |  |  |  |  |
Accounts receivable | 14,307,000 |  | 14,307,000 |  |  |  |  |  |  |  |
Inventory |  |  |  |  |  |  |  |  |  | 8,090,000 | 5,704,000
Other current assets | 7,036,000 |  | 7,036,000 |  |  |  |  |  |  |  |
Property, plants, equipment and mineral interests, net | 715,391,000 |  | 715,391,000 | 715,400,000 |  |  |  |  |  |  |
Non-current restricted cash and investments | 4,471,000 |  | 4,471,000 |  |  |  |  |  |  |  |
Other non-current assets | 795,000 |  | 795,000 |  |  |  |  |  |  |  |
Total assets | 933,381,000 |  | 933,381,000 |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 22,227,000 |  | 22,227,000 |  |  |  |  |  |  |  |
Accrued liabilities |  |  |  |  | 7,613,000 | 509,000 |  |  |  |  |
Non-current liabilities |  |  |  |  |  |  | 177,016,000 | 11,113,000 | 390,000 |  |
Total liabilities | 218,868,000 |  | 218,868,000 |  |  |  |  |  |  |  |
Net assets | $ 714,513,000 |  | $ 714,513,000 |  |  |  |  |  |  |  |

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