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Note 4 - Commitments, Contingencies and Obligations (Details) (USD $) | 0 Months Ended | 1 Months Ended | 6 Months Ended |  |  | 1 Months Ended | 6 Months Ended | 3 Months Ended |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended |  |
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Dec. 11, 2013 | Sep. 30, 2013 | Jun. 30, 2014 | Apr. 30, 2009 | Jun. 30, 2014 Rio Grande Silver Inc And Emerald Mining And Leasing LLC [Member] Joint Venture [Member] | Jul. 31, 2014 Subsequent Event [Member] | Jun. 30, 2014 Casa Berardi [Member] | Jun. 30, 2014 Greens Creek [Member] | Mar. 31, 2014 Lucky Friday [Member] | Jun. 30, 2014 Lucky Friday [Member] | Apr. 12, 2013 Senior Notes [Member] | Jun. 30, 2014 Senior Notes [Member] | Apr. 30, 2014 Senior Notes [Member] | Aug. 31, 2012 Johnny M Mine Area near San Mateo, New Mexico [Member] | Dec. 31, 2012 Johnny M Mine Area near San Mateo, New Mexico [Member] | Jun. 30, 2011 Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member] | Apr. 30, 2013 Gilt Edge Mine Superfund Site [Member] Costs Incurred By The EPA [Member] | Jul. 30, 2010 Gilt Edge Mine Superfund Site [Member] Third Party Operator of Mine [Member] | Jul. 30, 2010 Gilt Edge Mine Superfund Site [Member] Third Mining Company [Member] | Apr. 30, 2013 Gilt Edge Mine Superfund Site [Member] | Jun. 30, 2014 Minimum [Member] | Jun. 30, 2014 Maximum [Member]
Note 4 - Commitments, Contingencies and Obligations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Environmental Remediation Obligation |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | 1,000,000 |  |  | 177,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 10,000,000
Payment Of Response Costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 | 1,100,000 |  |  |  |  |  |  |
Estimated Response Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  |  |  |
Estimated Future Response Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,000,000 | 4,200,000 |  |  |
Incurred Response Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191,000,000 |  |  |  |  |
Alleged Potential Response Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191,000,000 |  |
Loss Contingency, Damages Sought, Value |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 6.875% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Increase (Decrease), Net |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |
Contractual Obligations |  |  | 5,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Open Purchase Orders |  |  |  |  |  |  | 500,000 | 2,400,000 |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Noncapital Costs |  |  |  |  |  |  | 1,100,000 | 500,000 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments For Capital Lease Payments |  |  | 21,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies |  |  | 41,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Payments |  |  |  |  |  | 14,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  | $ 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Plaintiffs | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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