Derivative Instruments - Collateral by Counterparty (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Derivatives Assets and Liabilities Collateral Received by Counterparty
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition	$ 2,754,212	$ 3,619,222
Net Amount	2,754,212	3,619,222
ADM Investor Services, Inc.
Derivatives Assets and Liabilities Collateral Received by Counterparty
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition		104,888
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition	(9,908)
Net Amount		104,888
Net Amount	(9,908)
Deutsche Bank AG
Derivatives Assets and Liabilities Collateral Received by Counterparty
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition	2,693,923	1,933,109
Net Amount	2,693,923	1,933,109
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	70,197	1,625,006
Net Amount	$ 70,197	1,625,006
UBS AG
Derivatives Assets and Liabilities Collateral Received by Counterparty
Net Amount of Unrealized Gain Presented in the Consolidated Statement of Financial Condition		(43,781)
Net Amount		$ (43,781)