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Note 4 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  |  |  |  |  | Revised |
Mining properties, including asset retirement obligations |  | $ | 533,631 |  |  | $ | 404,905 |
Development costs |  |  | 444,229 |  |  |  | 390,094 |
Plants and equipment |  |  | 988,285 |  |  |  | 847,462 |
Land |  |  | 32,953 |  |  |  | 26,949 |
Mineral interests |  |  | 1,269,956 |  |  |  | 957,359 |
Construction in progress |  |  | 365,807 |  |  |  | 347,323 |
|  |  | 3,634,861 |  |  |  | 2,974,092 |
Less accumulated depreciation, depletion and amortization |  |  | 1,114,857 |  |  |  | 974,781 |
Net carrying value |  | $ | 2,520,004 |  |  | $ | 1,999,311 |
Lessee, Operating Lease, Disclosure [Table Text Block] |
Year ending December 31, |  |  |  |
2019 |  | $ | 7,919 |
2020 |  |  | 5,530 |
2021 |  |  | 3,578 |
2022 |  |  | 2,543 |
2023 |  |  | 2,182 |
Thereafter |  |  | 1,397 |
Total |  | $ | 23,149 |

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- Definition Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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