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Derivatives-Kinross Covered Call Options (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
KGC February 2013 $11 Call |  |
Beginning Balance | $ 3,000 |
Shares of Kinross | 100,000 | 100,000
Sale of call |  | 51,000
(Gain) on derivative instrument | (3,000) | (48,000)
Ending Balance |  | 3,000
KGC February 2014 $7 Call |  |
Beginning Balance |  |
Shares of Kinross | 100,000 | 100,000
Sale of call | 55,000 |
(Gain) on derivative instrument | (53,000) |
Ending Balance | 2,000 |
KGC February 2014 $8 Call |  |
Beginning Balance |  |
Shares of Kinross | 50,000 | 50,000
Sale of call | 35,000 |
(Gain) on derivative instrument | (34,000) |
Ending Balance | $ 1,000 |

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

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

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

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_SharesOfKinrossCoveredCall
Namespace Prefix: | XPL_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration