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Note 10 - Derivative Instruments | 12 Months Ended
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Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative Instruments and Hedging Activities Disclosure [Text Block] | Note 10: Derivative Instruments At times, we may use commodity forward sales commitments, commodity swap contracts and commodity put and call option contracts to manage our exposure to fluctuation in the prices of certain metals which we produce. Contract positions are designed to ensure that we will receive a defined minimum price for certain quantities of our production, thereby partially offsetting our exposure to fluctuations in the market. These instruments do, however, expose us to (i) credit risk in the event of non-performance by counterparties for contracts in which the contract price exceeds the spot price of a commodity and (ii) price risk to the extent that the spot price exceeds the contract price for quantities of our production covered under contract positions. We are currently using financially-settled forward contracts to manage the exposure to changes in prices of silver, gold, zinc and lead contained in our concentrate shipments between the time of shipment and final settlement. In addition, at times we use financially-settled forward contracts to manage the exposure to changes in prices of zinc and lead (but not silver and gold) contained in our forecasted future concentrate shipments; however, there were no open contracts under this program as of December 31, 2015. These contracts do not qualify for hedge accounting and are marked-to-market through earnings each period. At December 31, 2015, we recorded a current liability of $0.3 million on the contracts utilized to manage exposure to prices of metals in our concentrate shipments, which is included in other current liabilities and is net of $0.6 million in contracts in a fair value current asset position. We recognized a $6.2 million net gain during 2015 on the contracts utilized to manage exposure to prices of metals in our concentrate shipments, which is included in sales of products. The net gain recognized on the contracts offsets losses related to price adjustments on our provisional concentrate sales due to changes to silver, gold, lead and zinc prices between the time of sale and final settlement. We recognized an $8.3 million net gain during 2015 on the contracts utilized to manage exposure to prices for forecasted future concentrate shipments, which includes $18.8 million in gains realized on settled contracts. The net gain on these contracts is included as a separate line item under other income (expense), as they relate to forecasted future shipments, as opposed to sales that have already taken place but are subject to final pricing as discussed in the preceding paragraph. The net gain for 2015 is the result of decreasing zinc and lead prices and the advanced settlement of contracts in a gain position. This program, when utilized, is designed to mitigate the impact of potential future declines in lead and zinc prices from the price levels established in the contracts (see average price information below). The following tables summarize the quantities of metals committed under forward sales contracts at December 31, 2015 and 2014:
December 31, 2015 |  | Ounces/pounds under contract (in 000's) |  |  | Average price per ounce/pound |
|  | Silver (ounces) |  |  | Gold (ounces) |  |  | Zinc (pounds) |  |  | Lead (pounds) |  |  | Silver (ounces) |  |  | Gold (ounces) |  |  | Zinc (pounds) |  |  | Lead (pounds) |
Contracts on provisional sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 settlements |  |  | 1,368 |  |  |  | 5 |  |  |  | 23,755 |  |  |  | 8,433 |  |  | $ | 14.12 |  |  | $ | 1,076 |  |  | $ | 0.71 |  |  | $ | 0.77 |
December 31, 2014 |  | Ounces/pounds under contract (in 000's) |  |  | Average price per ounce/pound |
|  | Silver (ounces) |  |  | Gold (ounces) |  |  | Zinc (pounds) |  |  | Lead (pounds) |  |  | Silver (ounces) |  |  | Gold (ounces) |  |  | Zinc (pounds) |  |  | Lead (pounds) |
Contracts on provisional sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 settlements |  |  | 1,607 |  |  |  | 6 |  |  |  | 19,456 |  |  |  | 8,378 |  |  |  | 16.06 |  |  |  | 1,195 |  |  | $ | 1.01 |  |  | $ | 0.87 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 settlements |  |  | N/A |  |  |  | N/A |  |  |  | 46,738 |  |  |  | 29,652 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 0.96 |  |  | $ | 1.07 |
2016 settlements |  |  | N/A |  |  |  | N/A |  |  |  | 44,699 |  |  |  | 34,337 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 0.99 |  |  | $ | 1.03 |
2017 settlements |  |  | N/A |  |  |  | N/A |  |  |  | 1,984 |  |  |  | — |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.04 |  |  |  | N/A |
Our concentrate sales are based on a provisional sales price containing an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from the sale of the concentrates at the forward price at the time of the sale. The embedded derivative, which does not qualify for hedge accounting, is adjusted to market through earnings each period prior to final settlement.

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