Statements of Financial Condition (Parenthetical) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Limited Partners, Units (in units)	3,606,094.038	3,861,976.161
General Partner, Units (in units)	41,087.640	43,497.666
U.S. Treasury Bills [Member]
Investments in U.S. Treasury bills, Amortized cost	$ 77,949,255	$ 0