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Mineral Property (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Mineral properties	$ 15,617	$ 15,657
Lik Project Alaska (US)
Mineral properties	15,611	15,611
La Promesa (Peru)
Mineral properties	6	6
Montana Royalty Property (US)
Mineral properties	$ 0	$ 40

X

- Definition

Mineral properties, net of adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64895-109465

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=XPL_LikProjectAlaskaUSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=XPL_LaPromesaPeruMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=XPL_MontanaRoyaltyPropertyUSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: