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Short Term Debt - Interest Expense Short Term Debt (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Debt Disclosure [Abstract] |  |
Interest expense UBS short-term credit line | $ 36 | $ 50
Interest expense RBC short-term margin loan | 22 | 21
Total interest expense, short term margin loans | $ 58 | $ 71

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- Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_InterestExpenseRBCLoan
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_InterestExpenseUBSLoan
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_TotalInterestExpenseShortTermLoans
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant