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Note 4 - Trust Expenses (Details Textual)	9 Months Ended
	Sep. 30, 2025 USD ($)
Sponsors Fee Annualized Accrual Rate Based on Net Asset Value of Trust	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

Annualized sponsor's fee rate accrued daily based on the net asset value of the trust.

+ References

No definition available.

+ Details

Name:	gsg_SponsorsFeeAnnualizedAccrualRateBasedOnNetAssetValueOfTrust
Namespace Prefix:	gsg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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