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Note 9 - Investing in Index Futures (Details Textual) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Average Month-End Notional Amount of Derivative Contracts	$ 990,296,644	$ 978,676,366

X

- Definition

Average month end notional amount specified by the derivative contracts.

+ References

No definition available.

+ Details

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