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Business and Summary of Significant Accounting Policies - Sales of Kinross (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Accounting Policies [Abstract] |  |
Shares sold | 180 | 130
Proceeds | $ 1,591 | $ 2,035
Gain on sale | $ 1,464 | $ 1,937

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition No authoritative reference available. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition No authoritative reference available. + References No definition available. + Details
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Balance Type: | debit
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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | XPL_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration