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Note 11 - Business Segments and Significant Customers (Details) - Sales from Continuing Operations to Significant Metals Customers as a Percentage of Total Sales (Customer Concentration Risk [Member], Sales Revenue, Goods, Net [Member]) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Teck Metals Ltd.[Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major customer | 25.00% | 10.70% | 51.10%
Korea Zinc [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major customer | 22.50% | 37.20% | 18.40%
Trafigura AG [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major customer | 8.80% | 22.40% | 12.40%
MS Zinc [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major customer | 7.50% | 12.30% | 6.90%
CIBC [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Major customer | 10.90% |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Details
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