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Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Total Capital Expenditures Excluding Capital Leases | $ 164.8 |  |
Accumulated Capitalized Interest Costs | 16.2 | $ 13.5 |
Capital Leased Assets, Gross | 42.2 | 39.9 |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 26.0 | 24.4 |
Operating Leases, Rent Expense | 4.8 | $ 3.8 | $ 3.5
Lucky Friday [Member] |  |  |
Total Capital Expenditures Excluding Capital Leases | 41.5 |  |
Greens Creek [Member] |  |  |
Total Capital Expenditures Excluding Capital Leases | 47.0 |  |
Casa Berardi [Member] |  |  |
Total Capital Expenditures Excluding Capital Leases | 70.1 |  |
San Sebastian [Member] |  |  |
Total Capital Expenditures Excluding Capital Leases | $ 1.6 |  |

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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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