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Note 8. Employee Benefit Plans (Detail) - Fair Value By Asset Category (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla [Member] |  |
Assets at fair value | $ 609 | $ 1,495
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 166 | 466
Interest-bearing Deposits [Member] | Hecla [Member] |  |
Assets at fair value | 609 |
Interest-bearing Deposits [Member] | Hecla [Member] |  |
Assets at fair value |  | 1,495
Interest-bearing Deposits [Member] | Lucky Friday [Member] |  |
Assets at fair value | 166 | 466
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla [Member] |  |
Assets at fair value | 2,071 | 4,460
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 527 | 1,135
Common Stock [Member] | Hecla [Member] |  |
Assets at fair value | 2,071 |
Common Stock [Member] | Hecla [Member] |  |
Assets at fair value |  | 4,460
Common Stock [Member] | Lucky Friday [Member] |  |
Assets at fair value | 527 | 1,135
Closely Held Instruments [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla [Member] |  |
Assets at fair value | 2,777 | 3,660
Closely Held Instruments [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 738 | 994
Closely Held Instruments [Member] | Fair Value, Inputs, Level 3 [Member] | Hecla [Member] |  |
Assets at fair value | 13,300 | 12,508
Closely Held Instruments [Member] | Fair Value, Inputs, Level 3 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 3,566 | 3,356
Closely Held Instruments [Member] | Hecla [Member] |  |
Assets at fair value | 16,077 |
Closely Held Instruments [Member] | Hecla [Member] |  |
Assets at fair value |  | 16,168
Closely Held Instruments [Member] | Lucky Friday [Member] |  |
Assets at fair value | 4,304 | 4,350
Partnership/Joint Venture Interests [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla [Member] |  |
Assets at fair value | 1,836 | 3,360
Partnership/Joint Venture Interests [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 523 | 935
Partnership/Joint Venture Interests [Member] | Hecla [Member] |  |
Assets at fair value | 1,836 |
Partnership/Joint Venture Interests [Member] | Hecla [Member] |  |
Assets at fair value |  | 3,360
Partnership/Joint Venture Interests [Member] | Lucky Friday [Member] |  |
Assets at fair value | 523 | 935
Common Collective Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla [Member] |  |
Assets at fair value | 8,028 | 4,305
Common Collective Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 2,049 | 1,109
Common Collective Funds [Member] | Hecla [Member] |  |
Assets at fair value | 8,028 |
Common Collective Funds [Member] | Hecla [Member] |  |
Assets at fair value |  | 4,305
Common Collective Funds [Member] | Lucky Friday [Member] |  |
Assets at fair value | 2,049 | 1,109
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla [Member] |  |
Assets at fair value | 22,667 | 25,882
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 6,225 | 6,797
Mutual Funds [Member] | Hecla [Member] |  |
Assets at fair value | 22,667 |
Mutual Funds [Member] | Hecla [Member] |  |
Assets at fair value |  | 25,882
Mutual Funds [Member] | Lucky Friday [Member] |  |
Assets at fair value | 6,225 | 6,797
Fair Value, Inputs, Level 1 [Member] | Hecla [Member] |  |
Assets at fair value | 25,347 | 31,837
Fair Value, Inputs, Level 1 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 6,918 | 8,398
Fair Value, Inputs, Level 2 [Member] | Hecla [Member] |  |
Assets at fair value | 12,641 | 11,325
Fair Value, Inputs, Level 2 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 3,310 | 3,038
Fair Value, Inputs, Level 3 [Member] | Hecla [Member] |  |
Assets at fair value | 13,300 | 12,508
Fair Value, Inputs, Level 3 [Member] | Lucky Friday [Member] |  |
Assets at fair value | 3,566 | 3,356
Hecla [Member] |  |
Assets at fair value | 51,288 |
Hecla [Member] |  |
Assets at fair value |  | 55,670
Lucky Friday [Member] |  |
Assets at fair value | $ 13,794 | $ 14,792

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant