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Note 15 - Acquisitions (Details) - Preliminary Purchase Price Allocation $ in Thousands, CAD in Millions | Jun. 15, 2015 USD ($) | Aug. 23, 2013 USD ($) | Jun. 02, 2013 USD ($) | Jun. 02, 2013 CAD | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
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Note 15 - Acquisitions (Details) - Preliminary Purchase Price Allocation [Line Items] |  |  |  |  |  |
Cash payments |  |  | $ 496,200 | CAD 514.5 |  |
Hecla stock issued |  |  | 218,300 | 226.3 |  |
Total consideration |  |  | $ 714,500 | CAD 740.8 |  |
Assets: |  |  |  |  |  |
Property, plants, equipment and mineral interests |  |  |  |  |  | $ 715,400
Revett Mining Company Inc [Member] |  |  |  |  |  |
Note 15 - Acquisitions (Details) - Preliminary Purchase Price Allocation [Line Items] |  |  |  |  |  |
Cash payments | $ 949 |  |  |  |  |
Hecla stock issued | 19,133 |  |  |  |  |
Total consideration | 20,082 |  |  |  |  |
Assets: |  |  |  |  |  |
Cash | 140 |  |  |  |  |
Accounts receivable | 137 |  |  |  |  |
Inventory | 472 |  |  |  |  |
Deferred tax assets | 7,193 |  |  |  |  |
Property, plants, equipment and mineral interests | 17,609 |  |  |  |  |
Reclamation insurance | 16,800 |  |  |  | $ 16,800 |
Other assets | 280 |  |  |  |  |
Total assets | 42,631 |  |  |  |  |
Liabilities: |  |  |  |  |  |
Accounts payable | 975 |  |  |  |  |
Notes payable | 4,061 |  |  |  |  |
Non-current reclamation liability | 17,513 |  |  |  | $ 17,500 |
Total liabilities | 22,549 |  |  |  |  |
Net assets | $ 20,082 |  |  |  |  |
Aurizon Mines Ltd [Member] |  |  |  |  |  |
Note 15 - Acquisitions (Details) - Preliminary Purchase Price Allocation [Line Items] |  |  |  |  |  |
Cash payments |  | $ 496,211 |  |  |  |
Hecla stock issued |  | 218,302 |  |  |  |
Total consideration |  | 714,513 |  |  |  |
Assets: |  |  |  |  |  |
Cash |  | 177,587 |  |  |  |
Accounts receivable |  | 14,307 |  |  |  |
Other current assets |  | 7,036 |  |  |  |
Property, plants, equipment and mineral interests |  | 715,391 |  |  |  |
Non-current restricted cash and investments |  | 4,471 |  |  |  |
Other assets |  | 795 |  |  |  |
Total assets |  | 933,381 |  |  |  |
Liabilities: |  |  |  |  |  |
Accounts payable |  | 22,227 |  |  |  |
Non-current reclamation liability |  | 11,113 |  |  |  |
Total liabilities |  | 218,868 |  |  |  |
Net assets |  | 714,513 |  |  |  |
Aurizon Mines Ltd [Member] | Bullion and Stockpiled Ore [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Inventory |  | 8,090 |  |  |  |
Aurizon Mines Ltd [Member] | Supplies [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Inventory |  | 5,704 |  |  |  |
Aurizon Mines Ltd [Member] | Accrued Payroll and Related Benefits [Member] |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |
Other current liabilities |  | 7,613 |  |  |  |
Aurizon Mines Ltd [Member] | Accrued Taxes [Member] |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |
Other current liabilities |  | 509 |  |  |  |
Aurizon Mines Ltd [Member] | Non-current Deferred Tax Liability [Member] |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |
Other non-current liabilities |  | 177,016 |  |  |  |
Aurizon Mines Ltd [Member] | Other Non-current Liabilities [Member] |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |
Other non-current liabilities |  | $ 390 |  |  |  |

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