Consolidated Condensed Schedule of Investments of U.S. Treasury Securities (Unaudited) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Schedule of Investments [Line Items]
% of Partners' Capital (Net Asset Value)	61.66%		65.15%
U.S. Treasury Securities [Member]
Schedule of Investments [Line Items]
Fair Value	$ 64,041,413		$ 88,102,079
% of Partners' Capital (Net Asset Value)	8.19%	[1]	10.01%	[1]
Investment Owned, at Cost	64,284,817		88,765,255
U.S. Treasury Securities [Member] | 1.25% U.S.Treasury Notes Due 2014-04-15 [Member]
Schedule of Investments [Line Items]
Face Value	2,415,000		5,115,000
Fair Value	2,429,876		5,145,478
% of Partners' Capital (Net Asset Value)	0.31%	[1]	0.58%	[1]
U.S. Treasury Securities [Member] | 0.25% U.S.Treasury Notes Due 2014-05-31 [Member]
Schedule of Investments [Line Items]
Face Value	3,000,000		3,000,000
Fair Value	3,003,450		3,002,417
% of Partners' Capital (Net Asset Value)	0.38%	[1]	0.34%	[1]
U.S. Treasury Securities [Member] | 2.25% U.S.Treasury Notes Due 2014-05-31 [Member]
Schedule of Investments [Line Items]
Face Value	8,750,000		8,750,000
Fair Value	8,847,398		8,843,870
% of Partners' Capital (Net Asset Value)	1.13%	[1]	1.01%	[1]
U.S. Treasury Securities [Member] | 0.25% U.S.Treasury Notes Due 2014-06-30 [Member]
Schedule of Investments [Line Items]
Face Value	4,000,000		4,000,000
Fair Value	4,004,390		4,003,152
% of Partners' Capital (Net Asset Value)	0.51%	[1]	0.45%	[1]
U.S. Treasury Securities [Member] | 2.63% U.S.Treasury Notes Due 2014-06-30 [Member]
Schedule of Investments [Line Items]
Face Value	5,100,000		8,100,000
Fair Value	5,166,125		8,201,206
% of Partners' Capital (Net Asset Value)	0.66%	[1]	0.93%	[1]
U.S. Treasury Securities [Member] | 2.38% U.S.Treasury Notes Due 2014-08-31 [Member]
Schedule of Investments [Line Items]
Face Value	5,000,000		5,000,000
Fair Value	5,057,396		5,113,984
% of Partners' Capital (Net Asset Value)	0.65%	[1]	0.58%	[1]
U.S. Treasury Securities [Member] | 0.25% U.S.Treasury Notes Due 2014-09-30 [Member]
Schedule of Investments [Line Items]
Face Value	5,000,000		5,000,000
Fair Value	5,004,134		5,007,294
% of Partners' Capital (Net Asset Value)	0.64%	[1]	0.57%	[1]
U.S. Treasury Securities [Member] | 2.13% U.S.Treasury Notes Due 2014-11-30 [Member]
Schedule of Investments [Line Items]
Face Value	7,200,000		7,200,000
Fair Value	7,348,048		7,340,891
% of Partners' Capital (Net Asset Value)	0.94%	[1]	0.83%	[1]
U.S. Treasury Securities [Member] | 0.25% U.S.Treasury Notes Due 2014-12-15 [Member]
Schedule of Investments [Line Items]
Face Value	3,185,000		3,185,000
Fair Value	3,190,812		3,187,984
% of Partners' Capital (Net Asset Value)	0.41%	[1]	0.36%	[1]
U.S. Treasury Securities [Member] | 0.13% U.S.Treasury Notes Due 2014-12-31 [Member]
Schedule of Investments [Line Items]
Face Value	2,700,000		2,700,000
Fair Value	2,701,480		2,699,167
% of Partners' Capital (Net Asset Value)	0.35%	[1]	0.31%	[1]
U.S. Treasury Securities [Member] | 0.25% U.S.Treasury Notes Due 2015-01-31 [Member]
Schedule of Investments [Line Items]
Face Value	3,700,000		3,700,000
Fair Value	3,705,725		3,706,905
% of Partners' Capital (Net Asset Value)	0.47%	[1]	0.42%	[1]
U.S. Treasury Securities [Member] | 2.50% U.S.Treasury Notes Due 2015-03-31 [Member]
Schedule of Investments [Line Items]
Face Value	3,000,000
Fair Value	3,070,519
% of Partners' Capital (Net Asset Value)	0.39%	[1]
U.S. Treasury Securities [Member] | 0.13% U.S.Treasury Notes Due 2015-04-30 [Member]
Schedule of Investments [Line Items]
Face Value	5,000,000		5,000,000
Fair Value	5,001,649		4,995,210
% of Partners' Capital (Net Asset Value)	0.64%	[1]	0.57%	[1]
U.S. Treasury Securities [Member] | 0.25% U.S.Treasury Notes Due 2015-05-31 [Member]
Schedule of Investments [Line Items]
Face Value	5,500,000
Fair Value	5,510,411
% of Partners' Capital (Net Asset Value)	0.71%	[1]
U.S. Treasury Securities [Member] | 1.88% U.S.Treasury Notes Due 2014-02-28 [Member]
Schedule of Investments [Line Items]
Face Value			8,000,000
Fair Value			8,073,462
% of Partners' Capital (Net Asset Value)			0.92%	[1]
U.S. Treasury Securities [Member] | 1.75% U.S.Treasury Notes Due 2014-03-31 [Member]
Schedule of Investments [Line Items]
Face Value			8,350,000
Fair Value			8,420,926
% of Partners' Capital (Net Asset Value)			0.96%	[1]
U.S. Treasury Securities [Member] | 1.00% U.S.Treasury Notes Due 2014-05-15 [Member]
Schedule of Investments [Line Items]
Face Value			7,500,000
Fair Value			7,534,638
% of Partners' Capital (Net Asset Value)			0.86%	[1]
U.S. Treasury Securities [Member] | 0.25% U.S.Treasury Notes Due 2015-12-31 [Member]
Schedule of Investments [Line Items]
Face Value			2,833,000
Fair Value			$ 2,825,495
% of Partners' Capital (Net Asset Value)			0.32%	[1]

[1] Represents the annualized yield at date of purchase for discount securities, the stated coupon rate for coupon-bearing securities, or the stated interest rate for certificates of deposit.