Derivative Instruments - Offsetting of Derivative Liabilities (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Offsetting of Derivative Liabilities
Gross Amount of Recognized Liabilities	$ 2,323,075	$ 3,126,332
Gross Amounts Offset in the Consolidated Statement of Financial Condition	(2,323,075)	(3,126,332)
Futures Contracts
Offsetting of Derivative Liabilities
Gross Amount of Recognized Liabilities	2,033,337	2,578,536
Gross Amounts Offset in the Consolidated Statement of Financial Condition	(2,033,337)	(2,578,536)
Forward Contracts
Offsetting of Derivative Liabilities
Gross Amount of Recognized Liabilities	212,821	547,796
Gross Amounts Offset in the Consolidated Statement of Financial Condition	(212,821)	$ (547,796)
Swap Contracts
Offsetting of Derivative Liabilities
Gross Amount of Recognized Liabilities	76,917
Gross Amounts Offset in the Consolidated Statement of Financial Condition	$ (76,917)