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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Note 11 - Derivative Instruments (Details Textual) $ in Thousands, MXN in Millions, CAD in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 CAD	Mar. 31, 2017 MXN
Maximum Allocation of Forecasted CAD-demonimated Operating Costs	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	$ (2,000)
Gain (Loss) on Sale of Derivatives	(7,809)
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness	10
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	5,900
Derivative, Fair Value, Obligations Under the Agreements	5,900
Cost of Sales [Member]
Gain (Loss) on Sale of Derivatives	(100)
Other Comprehensive Income (Loss) [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	$ (1,400)
Casa Berardi [Member] \| Minimum [Member]
Derivative, Forward Contracts, Forecasted Cash Operating Costs, Percent	20.00%		20.00%	20.00%
Casa Berardi [Member] \| Maximum [Member]
Derivative, Forward Contracts, Forecasted Cash Operating Costs, Percent	75.00%		75.00%	75.00%
San Sebastian [Member]
Derivative, Forward Contracts, Forecasted Cash Operating Costs, Percent	75.00%		75.00%	75.00%
Foreign Exchange Contract [Member] \| Other Current Assets [Member]
Derivative Asset, Current	$ 200
Foreign Exchange Contract [Member] \| Other Noncurrent Assets [Member]
Derivative Asset, Noncurrent	100
Foreign Exchange Contract [Member] \| Other Current Liabilities [Member]
Derivative Liability, Current	1,600
Foreign Exchange Contract [Member] \| Other Noncurrent Liabilities [Member]
Derivative Liability, Noncurrent	$ 1,200
Foreign Exchange Contract [Member] \| Casa Berardi [Member] \| Minimum [Member] \| United States of America, Dollars
Derivative, Forward Exchange Rate	1.2787		1.2787	1.2787
Foreign Exchange Contract [Member] \| Casa Berardi [Member] \| Maximum [Member] \| United States of America, Dollars
Derivative, Forward Exchange Rate	1.338		1.338	1.338
Foreign Exchange Contract [Member] \| San Sebastian [Member] \| Minimum [Member] \| United States of America, Dollars
Derivative, Forward Exchange Rate	19.1956		19.1956	19.1956
Foreign Exchange Contract [Member] \| San Sebastian [Member] \| Maximum [Member] \| United States of America, Dollars
Derivative, Forward Exchange Rate	21		21	21
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| Casa Berardi [Member]
Derivative, Number of Instruments Held	118		118	118
Derivative, Notional Amount	$ 200,000		CAD 260.1
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| San Sebastian [Member]
Derivative, Number of Instruments Held	18		18	18
Derivative, Notional Amount	$ 7,600			MXN 150
Commodity Contract [Member] \| Other Current Assets [Member]
Derivative Asset, Current	200
Commodity Contract [Member] \| Other Current Liabilities [Member]
Derivative Liability, Current	2,000
Derivative Liability, Fair Value, Gross Asset	700
Commodity Contract [Member] \| Other Noncurrent Liabilities [Member]
Derivative Liability, Noncurrent	400
Derivative Liability, Fair Value, Gross Asset	200
Unsettled Concentrate Sales Contracts [Member]
Derivative, Loss on Derivative	4,100
Forecasted Future Concentrate Contracts [Member]
Derivative, Loss on Derivative	$ 7,800