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Note 8. Employee Benefit Plans (Detail) - Allocations Of Investments And Measurement Dates By Asset Category | Dec. 31, 2011 | Dec. 31, 2010
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Hecla [Member] | Interest-bearing Deposits [Member] |  |
Allocation Of Investment | 1.00% | 3.00%
Hecla [Member] | Equity Securities [Member] |  |
Allocation Of Investment | 35.00% | 34.00%
Hecla [Member] | Debt Securities [Member] |  |
Allocation Of Investment | 43.00% | 39.00%
Hecla [Member] | Real Estate [Member] |  |
Allocation Of Investment | 13.00% | 10.00%
Hecla [Member] | Precious Metals And Other [Member] |  |
Allocation Of Investment | 8.00% | 14.00%
Hecla [Member] |  |
Allocation Of Investment | 100.00% | 100.00%
Lucky Friday [Member] | Interest-bearing Deposits [Member] |  |
Allocation Of Investment | 1.00% | 3.00%
Lucky Friday [Member] | Equity Securities [Member] |  |
Allocation Of Investment | 35.00% | 34.00%
Lucky Friday [Member] | Debt Securities [Member] |  |
Allocation Of Investment | 44.00% | 39.00%
Lucky Friday [Member] | Real Estate [Member] |  |
Allocation Of Investment | 12.00% | 10.00%
Lucky Friday [Member] | Precious Metals And Other [Member] |  |
Allocation Of Investment | 8.00% | 14.00%
Lucky Friday [Member] |  |
Allocation Of Investment | 100.00% | 100.00%

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- Definition The aggregate percentage of the fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of total plan assets held as of the measurement date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant