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Note 13 - Acquisition of Aurizon Mines Ltd. (Details) - Preliminary Purchase Price Allocation In Thousands, unless otherwise specified | 6 Months Ended | 9 Months Ended |  |
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Sep. 30, 2013 USD ($) | Sep. 30, 2013 CAD | Sep. 30, 2013 USD ($) | Apr. 30, 2013 USD ($) | Sep. 30, 2013 Accrued Payroll and Related Benefits [Member] USD ($) | Sep. 30, 2013 Accrued Taxes [Member] USD ($) | Sep. 30, 2013 Non-current Deferred Tax Liability [Member] USD ($) | Sep. 30, 2013 Non-current Reclamation [Member] USD ($) | Sep. 30, 2013 Other Non-current Liabilities [Member] USD ($) | Sep. 30, 2013 Bullion and Stockpiled Ore [Member] USD ($) | Sep. 30, 2013 Supplies [Member] USD ($)
Consideration: |  |  |  |  |  |  |  |  |  |  |
Cash payments | $ 496,400 | 514,500 | $ 496,211 |  |  |  |  |  |  |  |
Hecla stock issued (56,997,790 shares at $3.83 per share) | 218,300 | 226,300 | 218,302 |  |  |  |  |  |  |  |
Total consideration | 714,500 | 740,800 | 714,513 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Cash | 177,587 |  | 177,587 |  |  |  |  |  |  |  |
Accounts receivable | 14,307 |  | 14,307 |  |  |  |  |  |  |  |
Inventory |  |  |  |  |  |  |  |  |  | 8,090 | 5,704
Other current assets | 7,036 |  | 7,036 |  |  |  |  |  |  |  |
Properties, plants, equipment and mineral interests, net | 715,391 |  | 715,391 | 715,400 |  |  |  |  |  |  |
Non-current restricted cash and investments | 4,471 |  | 4,471 |  |  |  |  |  |  |  |
Other non-current assets | 795 |  | 795 |  |  |  |  |  |  |  |
Total assets | 933,381 |  | 933,381 |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 22,227 |  | 22,227 |  |  |  |  |  |  |  |
Accrued liabilities |  |  |  |  | 7,613 | 509 |  |  |  |  |
Non-current liabilities |  |  |  |  |  |  | 177,016 | 11,113 | 390 |  |
Total liabilities | 218,868 |  | 218,868 |  |  |  |  |  |  |  |
Net assets | $ 714,513 |  | $ 714,513 |  |  |  |  |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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