Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Investments in Securities, cost	$ 307,085,655	$ 309,799,635
US Treasury Bill Securities [Member]
Investments in Securities, cost	136,036,343	146,136,233
Affiliated Investments [Member]
Affiliated Investments, at Cost	$ 171,049,312	$ 163,663,402