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Short-Term Debt - Short Term Margin Loans (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Notes to Financial Statements
Outstanding UBS short-term credit line	$ 2,000	$ 2,000
Outstanding RBC short term margin loan	$ 1,123

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- Definition

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Name:	XPL_CreditLineOutstandingUBS
Namespace Prefix:	XPL_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Name:	XPL_NotesToFinancialStatementsAbstract
Namespace Prefix:	XPL_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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+ Details

Name:	XPL_ShortTermMarginLoanOutstandingRBC
Namespace Prefix:	XPL_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant