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Mineral Properties (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Mineral Properties	$ 16,316	$ 16,306
Lik project (Alaska - US)
Mineral Properties	15,611	15,611
Golden Crest (South Dakota - US)
Mineral Properties	$ 705	$ 695

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- 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=sodi_LikProjectAlaskaUSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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