XML 32 R40.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Long-Term Debt - Augusta Debt Interest Accretion (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Debt Disclosure [Abstract] |  |  |  |
Interest accretion on Augusta debt | $ 38,000 | $ 49,000 | $ 81,000 | $ 102,000

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

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