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Note 6 - Business Segments (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Number of Reportable Segments |  |  | 4 |
Gain (Loss) on Sale of Derivatives | $ (11,226) | $ 7 | $ (16,548) |
Employee Labor Strike Related Costs | 4,780 |  | 14,385 |
Lucky Friday [Member] | Suspension Costs [Member] |  |  |  |
Employee Labor Strike Related Costs |  |  | 11,100 |
Lucky Friday [Member] | Non-cash Depreciation Expense [Member] |  |  |  |
Employee Labor Strike Related Costs |  |  | $ 3,300 |
Base Metal Derivatives [Member] | Sales [Member] |  |  |  |
Gain (Loss) on Sale of Derivatives | $ 200 |  |  |

X
- Definition Amount of expenses associated with a labor strike by a portion of the reporting entity's workforce. + References No definition available. + Details
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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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