Derivative Instruments - Offsetting of Derivative Liabilities (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Offsetting of Derivative Liabilities
Gross Amount of Recognized Liabilities	$ 1,973,562	$ 3,126,332
Gross Amounts Offset in the Consolidated Statement of Financial Condition	(1,973,562)	(3,126,332)
Futures Contracts
Offsetting of Derivative Liabilities
Gross Amount of Recognized Liabilities	1,657,837	2,578,536
Gross Amounts Offset in the Consolidated Statement of Financial Condition	(1,657,837)	(2,578,536)
Forward Contracts
Offsetting of Derivative Liabilities
Gross Amount of Recognized Liabilities	281,376	547,796
Gross Amounts Offset in the Consolidated Statement of Financial Condition	(281,376)	$ (547,796)
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition	113,599
Swap Contracts
Offsetting of Derivative Liabilities
Gross Amount of Recognized Liabilities	34,349
Gross Amounts Offset in the Consolidated Statement of Financial Condition	$ (34,349)