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Note 4 - Trust Expenses (Details Textual)	3 Months Ended
	Mar. 31, 2026 USD ($)
Management and Service Fees, Base Rate	0.75%
Maximum [Member]
Legal Fees Per Year Maximum	$ 500,000

X

- Definition

Maximum per annum in legal fees and expenses the sponsor has agreed to assume.

+ References

No definition available.

+ Details

Name:	gsg_LegalFeesPerYearMaximum
Namespace Prefix:	gsg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Base rate for management and service fees under arrangement to manage operations, including, but not limited to, investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

Name:	us-gaap_ManagementAndServiceFeesBaseRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: