Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Investments in Securities, cost	$ 98,254,396	$ 113,645,878
US Treasury Bill Securities [Member]
Investments in Securities, cost	76,971,296	55,776,919
Affiliated Investments [Member]
Affiliated Investments, at Cost	$ 21,283,100	$ 57,868,959