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Note 11 - Business Segments and Significant Customers (Detail) - Information About Reportable Segments (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net sales to unaffiliated customers: |  |  |
Net Sales From Continuing Operations To Unaffiliated Customers | $ 321,143 | $ 477,634 | $ 418,813
Income (loss) from operations: |  |  |
Income (Loss) From Operations | 37,866 | 197,645 | (51,555)
Capital additions (including non-cash additions): |  |  |
Capital Additions (Including Non-Cash Additions) | 129,942 | 137,385 | 74,739
Depreciation, depletion and amortization: |  |  |
Depreciation, Depletion And Amortization From Continuing Operations | 43,522 | 47,066 | 60,011
Other significant non-cash items: |  |  |
Other Significant Non-Cash Items From Continuing Operations | 38,051 | 33,810 | 80,533
Identifiable assets: |  |  |
Identifiable Assets | 1,378,290 | 1,396,090 | 1,382,493
Greens Creek [Member] |  |  |
Net sales to unaffiliated customers: |  |  |
Net Sales From Continuing Operations To Unaffiliated Customers | 320,895 | 342,906 | 313,318
Income (loss) from operations: |  |  |
Income (Loss) From Operations | 138,245 | 181,116 | 138,973
Capital additions (including non-cash additions): |  |  |
Capital Additions (Including Non-Cash Additions) | 62,184 | 41,657 | 18,280
Depreciation, depletion and amortization: |  |  |
Depreciation, Depletion And Amortization From Continuing Operations | 43,522 | 41,013 | 51,671
Other significant non-cash items: |  |  |
Other Significant Non-Cash Items From Continuing Operations | 4,037 | 2,326 | 17,829
Identifiable assets: |  |  |
Identifiable Assets | 741,666 | 729,289 | 740,573
Lucky Friday [Member] |  |  |
Net sales to unaffiliated customers: |  |  |
Net Sales From Continuing Operations To Unaffiliated Customers | 248 | 134,728 | 105,495
Income (loss) from operations: |  |  |
Income (Loss) From Operations | (25,179) | 75,608 | 48,639
Capital additions (including non-cash additions): |  |  |
Capital Additions (Including Non-Cash Additions) | 55,998 | 60,454 | 54,370
Depreciation, depletion and amortization: |  |  |
Depreciation, Depletion And Amortization From Continuing Operations |  | 6,053 | 8,340
Other significant non-cash items: |  |  |
Other Significant Non-Cash Items From Continuing Operations | 92 | 14 | 5,053
Identifiable assets: |  |  |
Identifiable Assets | 226,196 | 213,285 | 170,928
All Other Segments [Member] |  |  |
Income (loss) from operations: |  |  |
Income (Loss) From Operations | (75,200) | (59,079) | (239,167)
Capital additions (including non-cash additions): |  |  |
Capital Additions (Including Non-Cash Additions) | 11,760 | 35,274 | 2,089
Other significant non-cash items: |  |  |
Other Significant Non-Cash Items From Continuing Operations | 33,922 | 31,470 | 57,651
Identifiable assets: |  |  |
Identifiable Assets | $ 410,428 | $ 453,516 | $ 470,992

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