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Note 11. Business Segments and Significant Customers (Detail) - Percentage Of Sales By Segment | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | ---
Percentage Of Sales From Continuing Operations | 100.00% | 100.00% | 100.00%
Greens Creek [Member] |  |  |
Percentage Of Sales From Continuing Operations | 71.80% | 74.80% | 73.40%
Lucky Friday [Member] |  |  |
Percentage Of Sales From Continuing Operations | 28.20% | 25.20% | 26.60%

X
- Definition The percentage of net product revenue to total net revenue from the sale of goods as of year end. + References No definition available. + Details
Name: | us-gaap_SalesRevenueGoodsNetPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant