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Subsequent Event (Details Narrative) $ in Thousands	Jan. 22, 2019 USD ($)
Subsequent Events [Abstract]
Sale of interests in retained royalty (CDN $)	$ 250
One-year note for sale of retained royalty (CDN $)	$ 350

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- References

No definition available.

+ Details

Name:	XPL_NoteForSaleOfRoyalty
Namespace Prefix:	XPL_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	XPL_SaleOfRoyaltyInterest
Namespace Prefix:	XPL_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration