Trading Activities - Offsetting of Derivative Assets and Liabilities (Detail) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Gross Amounts Recognized, Assets	$ 2,435,196	$ 1,683,026
Gross Amounts Offset in the Statements of Financial Condition, Assets	(950,030)	(1,032,826)
Amounts Presented in the Statements of Financial Condition, Assets	1,485,166	650,200
Net Amount, Assets	1,485,166	650,200
Gross Amounts Recognized, Liabilities	(950,030)	(1,294,215)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	950,030	1,032,826
Amounts Presented in the Statements of Financial Condition, Liabilities		(261,389)
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received/ Pledged, Liabilities		261,389
Net fair value	1,485,166	650,200
Futures Contracts [Member]
Derivative [Line Items]
Gross Amounts Recognized, Assets	1,095,148	1,455,308
Gross Amounts Offset in the Statements of Financial Condition, Assets	(240,506)	(805,108)
Amounts Presented in the Statements of Financial Condition, Assets	854,642	650,200
Net Amount, Assets	854,642	650,200
Gross Amounts Recognized, Liabilities	(240,506)	(805,108)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	240,506	805,108
Amounts Presented in the Statements of Financial Condition, Liabilities		0
Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts Recognized, Assets	1,340,048	227,718
Gross Amounts Offset in the Statements of Financial Condition, Assets	(709,524)	(227,718)
Amounts Presented in the Statements of Financial Condition, Assets	630,524	0
Net Amount, Assets	630,524
Gross Amounts Recognized, Liabilities	(709,524)	(489,107)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	$ 709,524	227,718
Amounts Presented in the Statements of Financial Condition, Liabilities		(261,389)
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received/ Pledged, Liabilities		$ 261,389