Derivative Instruments - Collateral by Counterparty (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Derivatives Assets and Liabilities Collateral Received by Counterparty
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition		$ 1,545,931
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition	$ (354,585)
Net Amount		1,545,931
Net Amount	(354,585)
Deutsche Bank AG
Derivatives Assets and Liabilities Collateral Received by Counterparty
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition	(137,441)	(734,698)
Net Amount	(137,441)	(734,698)
SG Americas Securities, LLC
Derivatives Assets and Liabilities Collateral Received by Counterparty
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition	32,628	1,582,067
Net Amount	32,628	1,582,067
UBS AG
Derivatives Assets and Liabilities Collateral Received by Counterparty
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition	(510,029)	(40,113)
Net Amount	(510,029)	(40,113)
Wells Fargo Securities LLC
Derivatives Assets and Liabilities Collateral Received by Counterparty
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition	260,257	738,675
Net Amount	$ 260,257	$ 738,675