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Note 11 - Derivative Instruments (Details Textual) $ in Thousands, CAD in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2016 CAD
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] |  |
Derivative, Number of Instruments Held | 70 | 70
Foreign Exchange Contract [Member] | Minimum [Member] | Casa Berardi [Member] | United States of America, Dollars |  |
Derivative, Forward Exchange Rate | 1.2787 | 1.2787
Foreign Exchange Contract [Member] | Maximum [Member] | Casa Berardi [Member] | Canada, Dollars |  |
Derivative, Forward Exchange Rate | 1.3031 | 1.3031
Foreign Exchange Contract [Member] | Other Noncurrent Assets [Member] |  |
Derivative Asset, Noncurrent | $ 48 |
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] |  |
Derivative Liability, Current | 700 |
Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member] |  |
Derivative Liability, Noncurrent | 900 |
Unsettled Concentrate Sales Contracts [Member] |  |
Derivative, Loss on Derivative | $ 15,900 |
Minimum [Member] | Casa Berardi [Member] |  |
Derivative, Forward Contracts, Forecasted Cash Operating Costs, Percent | 20.00% | 20.00%
Maximum [Member] | Casa Berardi [Member] |  |
Derivative, Forward Contracts, Forecasted Cash Operating Costs, Percent | 44.00% | 44.00%
Other Current Liabilities [Member] |  |
Derivative Liability, Current | $ 600 |
Other Comprehensive Income (Loss) [Member] |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | (700) |
Derivative, Notional Amount | $ 135,900 | CAD 175
Maximum Allocation of Forecasted CAD-demonimated Operating Costs | 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 | $ (1,600) |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness | $ (1) |
Maximum Percentage of Forecasted Metal Sales | 75.00% | 75.00%
Maximum Forecasted Metal Sales to be Hedged, Term | 5 years |
Derivative Asset, Current | $ 800 |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 3,200 |
Derivative, Fair Value, Obligations Under the Agreements | $ 3,200 |

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