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Note 4 - Commitments, Contingencies and Obligations (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 30, 2014 | Oct. 31, 2013 | Apr. 30, 2013 | Aug. 31, 2012 | Jun. 30, 2011 | Dec. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2013 | Apr. 30, 2009
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum Environmental Remediation Obligation |  |  |  |  |  |  | $ 2,500,000 |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  | 177,500
Payment Of Response Costs |  |  |  | 1,100,000 |  | 1,100,000 |  |  |  |
Other Accrued Liabilities, Noncurrent |  |  |  |  |  | 300,000 |  |  |  |
Estimated Response Costs |  |  |  |  | 4,500,000 |  |  |  |  |
Estimated Future Response Cost |  |  |  |  | 100,000,000 |  |  |  |  |
Proceeds from Issuance of Debt |  |  | 500,000,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.875% |  |  |  | 6.875% |  |  |
Contractual Obligations |  |  |  |  |  |  | 13,000,000 |  |  |
Noncapital Costs |  |  |  |  |  |  | 6,100,000 |  |  |
Commitments For Capital Lease Payments |  |  |  |  |  |  | 21,600,000 |  |  |
Environmental Expense and Liabilities | 55,400,000 | 15,000,000 |  |  |  |  | 1,190,000 | 2,908,000 |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  | 1,300,000 |
Casa Berardi [Member] |  |  |  |  |  |  |  |  |  |
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Noncapital Costs |  |  |  |  |  |  | 18,900,000 |  |  |
Greens Creek [Member] |  |  |  |  |  |  |  |  |  |
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Noncapital Costs |  |  |  |  |  |  | 500,000 |  |  |
Open Purchase Orders |  |  |  |  |  |  | 6,400,000 |  |  |
Lucky Friday [Member] |  |  |  |  |  |  |  |  |  |
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Noncapital Costs |  |  |  |  |  |  | 300,000 |  |  |
Open Purchase Orders |  |  |  |  |  |  | 200,000 |  |  |
Non-Capital Costs [Member] |  |  |  |  |  |  |  |  |  |
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual Obligations |  |  |  |  |  |  | 6,400,000 |  |  |
Costs Incurred By The EPA [Member] |  |  |  |  |  |  |  |  |  |
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Response Costs |  |  | 200,000,000 |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  | 0 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  | $ 10,000,000 |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The adjustment to exclude the noncash portion of, and include cash payments for environmental costs when calculating operating cash flows under the indirect method. The adjustment can include the increase (decrease) during an accounting period in total estimated obligations recorded for probable future loss attributable to environmental contamination issues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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