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Note 12 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 CAD ($) | Sep. 30, 2018 MXN ($)
Maximum Allocation of Forecasted CAD-demonimated Operating Costs | 75.00% |  | 75.00% |  | 75.00% | 75.00%
Forecasted CAD-denominated Operating Costs to be Hedged, Term |  |  | 5 years |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance | $ 1,500 |  | $ 1,500 |  |  |
Gain (Loss) on Sale of Derivatives | 19,460 | $ (11,226) | 40,271 | $ (16,548) |  |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness |  |  | 19 |  |  |
Derivative, Gain on Derivative | 5,000 |  | 8,300 |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total | 1,000 |  | 1,000 |  |  |
Derivative, Fair Value, Obligations Under the Agreements | 1,000 |  | 1,000 |  |  |
Cost of Sales [Member] |  |  |  |  |  |
Gain (Loss) on Sale of Derivatives |  |  | 200 |  |  |
Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | 800 |  | 800 |  |  |
Foreign Exchange Contract [Member] | Other Current Assets [Member] |  |  |  |  |  |
Derivative Asset, Current | 1,100 |  | 1,100 |  |  |
Foreign Exchange Contract [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |
Derivative Assets, Noncurrent, Total | 700 |  | 700 |  |  |
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] |  |  |  |  |  |
Derivative Liability, Current | $ 100 |  | $ 100 |  |  |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Minimum [Member] | United States of America, Dollars |  |  |  |  |  |
Derivative, Forward Exchange Rate | 1.2729 |  | 1.2729 |  | 1.2729 | 1.2729
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Maximum [Member] | United States of America, Dollars |  |  |  |  |  |
Derivative, Forward Exchange Rate | 1.3315 |  | 1.3315 |  | 1.3315 | 1.3315
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative, Number of Instruments Held, Total | 94 |  | 94 |  | 94 | 94
Derivative, Notional Amount | $ 174,000 |  | $ 174,000 |  | $ 225.1 |
Foreign Exchange Contract [Member] | San Sebastian [Member] | Minimum [Member] | United States of America, Dollars |  |  |  |  |  |
Derivative, Forward Exchange Rate | 19.44 |  | 19.44 |  | 19.44 | 19.44
Foreign Exchange Contract [Member] | San Sebastian [Member] | Maximum [Member] | United States of America, Dollars |  |  |  |  |  |
Derivative, Forward Exchange Rate | 20.855 |  | 20.855 |  | 20.855 | 20.855
Foreign Exchange Contract [Member] | San Sebastian [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative, Number of Instruments Held, Total | 30 |  | 30 |  | 30 | 30
Derivative, Notional Amount | $ 8,800 |  | $ 8,800 |  |  | $ 178.5
Commodity Contract [Member] | Other Current Assets [Member] |  |  |  |  |  |
Derivative Asset, Current | 300 |  | 300 |  |  |
Commodity Contract [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |
Derivative Assets, Noncurrent, Total | 600 |  | 600 |  |  |
Commodity Contract [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |
Derivative Liability, Noncurrent | 200 |  | 200 |  |  |
Unsettled Concentrate Sales Contracts [Member] |  |  |  |  |  |
Derivative, Gain on Derivative |  |  | 8,300 |  |  |
Forecasted Future Concentrate Contracts [Member] |  |  |  |  |  |
Derivative, Gain on Derivative | $ 32,800 |  | $ 40,300 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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