Schedules of Investments (Unaudited) - Open S&P GSCI ER Index Futures Contracts (Details) (Parentheticals)	Sep. 30, 2026	Dec. 31, 2025
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Short-Term Investments	Short-Term Investments

Indicates line item in statement of financial position that includes derivative asset.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-10

Name:	us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant