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Note 11 - Business Segments and Significant Customers (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule Of Sales Contributed By Each Segment Table Text Block |
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Greens Creek |  |  | 100.0 | % |  |  | 71.8 | % |  |  | 74.8 | %
Lucky Friday |  |  | — |  |  |  | 28.2 | % |  |  | 25.2 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Net sales to unaffiliated customers: |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 320,895 |  |  | $ | 342,906 |  |  | $ | 313,318 |
Lucky Friday |  |  | 248 |  |  |  | 134,728 |  |  |  | 105,495 |
|  | $ | 321,143 |  |  | $ | 477,634 |  |  | $ | 418,813 |
Income (loss) from operations: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 138,245 |  |  | $ | 181,116 |  |  | $ | 138,973 |
Lucky Friday |  |  | (25,179 | ) |  |  | 75,608 |  |  |  | 48,639 |
Other |  |  | (75,200 | ) |  |  | (59,079 | ) |  |  | (239,167 | )
|  | $ | 37,866 |  |  | $ | 197,645 |  |  | $ | (51,555 | )
Capital additions (including non-cash additions): |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 62,184 |  |  | $ | 41,657 |  |  | $ | 18,280 |
Lucky Friday |  |  | 55,998 |  |  |  | 60,454 |  |  |  | 54,370 |
Other |  |  | 11,760 |  |  |  | 35,274 |  |  |  | 2,089 |
|  | $ | 129,942 |  |  | $ | 137,385 |  |  | $ | 74,739 |
Depreciation, depletion and amortization: |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 43,522 |  |  | $ | 41,013 |  |  | $ | 51,671 |
Lucky Friday |  |  | — |  |  |  | 6,053 |  |  |  | 8,340 |
|  | $ | 43,522 |  |  | $ | 47,066 |  |  | $ | 60,011 |
Other significant non-cash items: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 4,037 |  |  | $ | 2,326 |  |  | $ | 17,829 |
Lucky Friday |  |  | 92 |  |  |  | 14 |  |  |  | 5,053 |
Other |  |  | 33,922 |  |  |  | 31,470 |  |  |  | 57,651 |
|  | $ | 38,051 |  |  | $ | 33,810 |  |  | $ | 80,533 |
Identifiable assets: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 741,666 |  |  | $ | 729,289 |  |  | $ | 740,573 |
Lucky Friday |  |  | 226,196 |  |  |  | 213,285 |  |  |  | 170,928 |
Other |  |  | 410,428 |  |  |  | 453,516 |  |  |  | 470,992 |
|  | $ | 1,378,290 |  |  | $ | 1,396,090 |  |  | $ | 1,382,493 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | 2012 |  |  | 2011 |  |  | 2010 |
United States |  | $ | 25,438 |  |  | $ | 24,409 |  |  | $ | 24,708 |
Canada |  |  | 34,441 |  |  |  | 240,569 |  |  |  | 124,862 |
Mexico |  |  | — |  |  |  | — |  |  |  | 16,258 |
Japan |  |  | 70,371 |  |  |  | 60,963 |  |  |  | 62,740 |
Korea |  |  | 120,106 |  |  |  | 92,919 |  |  |  | 94,114 |
China |  |  | 72,133 |  |  |  | 51,635 |  |  |  | 73,257 |
Belgium |  |  | — |  |  |  | — |  |  |  | 25,907 |
Total, excluding gains/losses on forward contracts |  | $ | 322,489 |  |  | $ | 470,495 |  |  | $ | 421,846 |
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] |
|  | 2012 |  |  | 2011 |
United States |  | $ | 996,405 |  |  | $ | 923,040 |
Canada |  |  | 198 |  |  |  | 99 |
Mexico |  |  | 56 |  |  |  | 73 |
|  | $ | 996,659 |  |  | $ | 923,212 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Teck Metals Ltd. |  |  | 10.7 | % |  |  | 51.1 | % |  |  | 29.6 | %
Korea Zinc |  |  | 37.2 | % |  |  | 18.4 | % |  |  | 20.7 | %
Trafigura AG |  |  | 22.4 | % |  |  | 12.4 | % |  |  | 17.4 | %
MS Zinc |  |  | 12.3 | % |  |  | 6.9 | % |  |  | 7.0 | %

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 + Details
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