Statements of Financial Condition (Parenthetical) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Investments in Securities, cost	$ 111,275,102	$ 141,078,285
Affiliated Investments [Member]
Investments in Securities, cost	79,277,598	86,092,194
US Treasury Bill Securities [Member]
Investments in Securities, cost	$ 31,997,504	$ 54,986,091