Condensed Schedule Of Investments (U.S. Treasury Notes) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Summary of Investment Holdings [Line Items]
Fair Value as a % of Partners' Capital	3.10%	(0.06%)
U.S. Treasury notes, 1.375%, 02/15/2020 [Member]
Summary of Investment Holdings [Line Items]
Face Amount		$ 47,270,000
Fair Value as a % of Partners' Capital		30.50%
Fair Value		$ 47,258,921
U.S. Treasury notes, 1.500%, 05/15/2020 [Member]
Summary of Investment Holdings [Line Items]
Face Amount	$ 33,270,000	$ 39,370,000
Fair Value as a % of Partners' Capital	26.31%	25.41%
Fair Value	$ 33,333,682	$ 39,359,235
U.S. Treasury notes, 1.500%, 08/15/2020 [Member]
Summary of Investment Holdings [Line Items]
Face Amount	$ 38,570,000	$ 46,970,000
Fair Value as a % of Partners' Capital	30.61%	30.30%
Fair Value	$ 38,777,916	$ 46,942,479
U.S. Treasury notes, 1.750%, 11/15/2020 [Member]
Summary of Investment Holdings [Line Items]
Face Amount	$ 38,370,000
Fair Value as a % of Partners' Capital	30.60%
Fair Value	$ 38,761,194
U.S. Treasury Notes [Member]
Summary of Investment Holdings [Line Items]
Fair Value as a % of Partners' Capital	87.52%	86.21%
Fair Value	$ 110,872,792	$ 133,560,635