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Contractual rate at which a foreign currency can be purchased or sold.

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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The number of derivative instruments of a particular group held by the entity.

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The net gain (loss) relating to components of the gain (loss) on foreign currency cash flow hedging instruments excluded from the assessment of hedge effectiveness. Recognized in earnings.

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Note 11 - Derivative Instruments (Details Textual) - 6 months ended Jun. 30, 2016 CAD in Millions	USD ($)	CAD	USD ($)
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]
Derivative, Forward Exchange Rate		1.2787	1.2787
Foreign Exchange Contract [Member] \| Maximum [Member] \| Casa Berardi [Member]
Derivative, Forward Exchange Rate		1.3031	1.3031
Foreign Exchange Contract [Member] \| Other Noncurrent Assets [Member]
Derivative Asset, Noncurrent			$ 500,000
Foreign Exchange Contract [Member] \| Other Current Liabilities [Member]
Derivative Liability, Current			100,000
Foreign Exchange Contract [Member] \| Other Noncurrent Liabilities [Member]
Derivative Liability, Noncurrent			$ 400,000
Unsettled Concentrate Sales Contracts [Member]
Derivative, Loss on Derivative	$ 11,800,000
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			$ 3,400,000
Other Comprehensive Income (Loss) [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months			(100,000)
Derivative, Notional Amount		CAD 175	$ 135,900,000
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			$ 46,000
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness	$ (6,000)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral			3,900,000
Derivative, Fair Value, Obligations Under the Agreements			$ 3,800,000