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Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) [Line Items] |  |  |
Total Capital Expenditures | $ 137.4 |  |
Accumulated Capitalized Interest Costs | 13.5 | $ 11.8 |
Capital Leased Assets, Gross | 39.9 | 39.5 |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 24.4 | 15.3 |
Operating Leases, Rent Expense | 3.8 | $ 3.5 | $ 3.1
Lucky Friday [Member] |  |  |
Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) [Line Items] |  |  |
Total Capital Expenditures | 53.3 |  |
Greens Creek [Member] |  |  |
Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) [Line Items] |  |  |
Total Capital Expenditures | 43.4 |  |
Casa Berardi [Member] |  |  |
Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) [Line Items] |  |  |
Total Capital Expenditures | 35.5 |  |
San Sebastian Unit [Member] |  |  |
Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) [Line Items] |  |  |
Total Capital Expenditures | $ 3.4 |  |

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- Definition Total capital expenditures incurred, excluding non-cash items for additions acquired under capital leases and adjustments for asset retirement obligations, capitalized interest, and deferred taxes. + References No definition available. + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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