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Marketable Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Marketable equity securities at fair value	$ 294	$ 1,322
Kinross Gold Corp. [Member]
Marketable equity securities at fair value	$ 0	$ 927
Shares	0	100,000
Vendetta Mining Corp. [Member]
Marketable equity securities at fair value	$ 57	$ 81
Shares	7,750,000	7,750,000
Vox Royalty Corp. [Member]
Marketable equity securities at fair value	$ 237	$ 314
Shares	50,000	134,055

X

- Definition

Amount of investment in marketable security, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	xpl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=xpl_VendettaMiningCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=xpl_VoxRoyaltyCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: