XML 59 R42.htm IDEA: XBRL DOCUMENT

Note 11 - Derivative Instruments (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Other Current Assets [Member] \| Unsettled Sales and Forecasted Future Concentrate Contracts [Member]
Derivative Liability, Current	$ 0.5
Unsettled Concentrate Sales Contracts [Member]
Derivative, Loss on Derivative	$ 6.1

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References + Details