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Note 1 - Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Capitalized Drilling Costs |  | $ 8,000,000 | $ 5,000,000 | $ 3,600,000
Income Tax Positions Likelihood Of Being Realized Upon Settlement | 50.00% |  |  |
Percent Of Mine License Tax |  |  | 98.00% | 98.00%
Environmental Exit Costs, Costs Accrued to Date |  | 105,200,000 |  |
Foreign Currency Transaction Loss, before Tax |  | 3,000,000 | 100,000 | 200,000
Share-based Compensation |  | 4,461,000 | 3,101,000 | 2,073,000
Unfunded Supplemental Executive Retirement Plan [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Pension Contributions | 400,000 | 300,000 | 300,000 | 300,000
Defined Benefit Pension Plan [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Pension Contributions | 7,500,000 | 1,000,000 | 1,100,000 |
ALASKA |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Percent Of Mine License Tax |  | 98.00% |  |
CANADA | Resource Taxes [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Taxes, Other |  | 600,000 |  |
Mine License Taxes [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Taxes, Other |  | $ 2,200,000 | $ 5,700,000 | $ 6,400,000
Silver [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Metals Contained In Concentrates (in Ounces) |  | 800,000 |  |
Metals Contained In Concentrates (in US Ton) |  | 800,000 |  |
Gold [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Metals Contained In Concentrates (in Ounces) |  | 2,994 |  |
Metals Contained In Concentrates (in US Ton) |  | 2,994 |  |
Zinc [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Metals Contained In Concentrates (in Ounces) |  | 6,171 |  |
Metals Contained In Concentrates (in US Ton) |  | 6,171 |  |
Lead [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Metals Contained In Concentrates (in Ounces) |  | 2,127 |  |
Metals Contained In Concentrates (in US Ton) |  | 2,127 |  |
Minimum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 1 year |  |
Maximum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 27 years |  |

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- Definition Carrying amount as of the balance sheet date of the liability for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 4 + Details
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