Schedule Of Investments - Treasury Bills and Money Market Fund (Parenthetical) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Investment, Identifier [Axis]: United States Treasury Obligations
Schedule of Investments [Line Items]
Restricted for maintenance margin	$ 68,537,000	$ 99,830,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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