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Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts Receivable, Net, Current | $ 9,270 | $ 2,617
Accounts Receivable, Net, Noncurrent | 1,209 | 1,096
Trade receivables - mineral concentrate sales [Member] |  |
Accounts Receivable, Net, Current | 8,345 | 1,868
Trade receivables - other [Member] |  |
Accounts Receivable, Net, Current | 925 | 749
Notes receivable and other [Member] |  |
Accounts Receivable, Net, Noncurrent | $ 1,209 | $ 1,096

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