Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Investments in Securities, cost	$ 36,172,567	$ 64,987,634
US Treasury Bill Securities [Member]
Investments in Securities, cost	13,966,540	14,957,355
Affiliated Investments [Member]
Affiliated investments, at cost	$ 22,206,027	$ 50,030,279