Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Investments in Securities, Cost	$ 489,147,926	$ 365,396,641
Affiliated Investments [Member]
Affiliated Investments, at Cost	306,158,232	245,419,058
US Treasury Bill Securities [Member]
Investments in Securities, Cost	$ 182,989,694	$ 119,977,583