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Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Payments to Acquire Property, Plant, and Equipment | $ 98,038 | $ 164,788 | $ 137,443
Accumulated Capitalized Interest Costs | 900 | 16,200 |
Capital Leased Assets, Gross | 48,600 | 42,200 |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 33,100 | 26,000 |
Operating Leases, Rent Expense | 4,800 | $ 4,800 | $ 3,800
Lucky Friday [Member] |  |  |
Payments to Acquire Property, Plant, and Equipment | 4,500 |  |
Greens Creek [Member] |  |  |
Payments to Acquire Property, Plant, and Equipment | 34,200 |  |
Casa Berardi [Member] |  |  |
Payments to Acquire Property, Plant, and Equipment | 47,100 |  |
San Sebastian [Member] |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 11,200 |  |

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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=84164758&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=84164758&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=82846649&loc=d3e38371-112697 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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