Fair Value Measurements (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss) on open contracts	$ 159,905	$ 363,947
Purchased options on futures contracts	515,818	22,525
Fixed income securities held by affiliate	14,704,345	21,870,890
Options written on futures contracts	(569,588)	(1,006)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased options on futures contracts	515,818	22,525
Fixed income securities held by affiliate
Total assets	675,723	235,169
Options written on futures contracts	569,588	1,006
Total fair value	106,135	234,163
Fair Value, Inputs, Level 1 [Member] | Futures Positions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased options on futures contracts	159,905
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed income securities held by affiliate	14,704,345	21,870,890
Total assets	14,704,345	22,022,193
Total fair value	14,704,345	22,022,193
Fair Value, Inputs, Level 2 [Member] | Futures Positions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased options on futures contracts		212,644
Fair Value, Inputs, Level 2 [Member] | Forward Currency Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased options on futures contracts	151,303
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss) on open contracts	19,952,245	21,870,890
Purchased options on futures contracts		22,525
Total assets	19,604,247	22,257,362
Options written on futures contracts	(34,540)	(1,006)
Total fair value	19,569,707	22,256,356
Recurring [Member] | Futures Positions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss) on open contracts	(347,998)	212,644
Recurring [Member] | Forward Currency Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss) on open contracts		151,303
Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased options on futures contracts		22,525
Total assets	(347,998)	235,169
Options written on futures contracts	(34,540)	(1,006)
Total fair value	(382,538)	234,163
Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed income securities held by affiliate	19,952,245	21,870,890
Total assets	19,952,245	22,022,193
Total fair value	$ 19,952,245	$ 22,022,193