CONDENSED SCHEDULE OF INVESTMENTS (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Investment Owned
Fixed income securities deposited with futures brokers	$ 22,932,456	$ 33,898,317
Fixed income securities deposited with interbank market makers	133,198,658	212,404,306
Fixed Income Securities [Member]
Investment Owned
Cost	156,354,447	246,385,165
Fixed Income Securities [Member] | Asset Backed Securities [Member]
Investment Owned
Cost	11,532,711	18,620,611
Fixed Income Securities [Member] | Bank Deposits [Member]
Investment Owned
Cost	2,250,068	4,831,757
Fixed Income Securities [Member] | Bank Deposits [Member] | Canada [Member] | Financials [Member]
Investment Owned
Cost		1,259,918
Fixed Income Securities [Member] | Bank Deposits [Member] | United States [Member] | Financials [Member]
Investment Owned
Cost		3,571,839
Fixed Income Securities [Member] | Commercial Paper [Member]
Investment Owned
Cost	49,829,535	89,190,349
Fixed Income Securities [Member] | Commercial Paper [Member] | Japan [Member] | Financials [Member]
Investment Owned
Cost		3,873,247
Fixed Income Securities [Member] | Commercial Paper [Member] | Switzerland [Member] | Financials [Member]
Investment Owned
Cost	1,590,983	1,442,613
Fixed Income Securities [Member] | Commercial Paper [Member] | United States [Member]
Investment Owned
Cost	48,238,552	83,874,489
Fixed Income Securities [Member] | Corporate Bonds [Member]
Investment Owned
Cost	62,077,646	79,697,739
Fixed Income Securities [Member] | Corporate Bonds [Member] | Australia [Member] | Financials [Member]
Investment Owned
Cost	364,957
Fixed Income Securities [Member] | Corporate Bonds [Member] | Canada [Member] | Financials [Member]
Investment Owned
Cost	6,289,499	1,184,446
Fixed Income Securities [Member] | Corporate Bonds [Member] | Japan [Member] | Financials [Member]
Investment Owned
Cost	2,043,076
Fixed Income Securities [Member] | Corporate Bonds [Member] | United Kingdom [Member]
Investment Owned
Cost	4,041,771	3,508,126
Fixed Income Securities [Member] | Corporate Bonds [Member] | United States [Member]
Investment Owned
Cost	49,338,343	75,005,167
Fixed Income Securities [Member] | Government and Agency Obligations [Member]
Investment Owned
Cost	30,664,487	54,044,709
Fixed Income Securities [Member] | Government and Agency Obligations [Member] | United States [Member] | U.S. Treasury Bills [Member]
Investment Owned
Fixed income securities deposited with futures brokers	22,932,456	33,898,317
Fixed income securities deposited with interbank market makers	7,730,616	20,121,686
Fixed Income Securities [Member] | Government and Agency Obligations [Member] | United States [Member] | U.S. Treasury Bills [Member] | U.S. Treasury Bills Due 01/17/2019 [Member]
Investment Owned
Maturity face value	$ 5,560,000
Due date	Jan. 17, 2019
Fixed Income Securities [Member] | Government and Agency Obligations [Member] | United States [Member] | U.S. Treasury Bills [Member] | U.S. Treasury Bills Due 02/21/2019 [Member]
Investment Owned
Maturity face value	$ 14,620,000
Due date	Feb. 21, 2019
Fixed Income Securities [Member] | Government and Agency Obligations [Member] | United States [Member] | U.S. Treasury Bills [Member] | U.S. Treasury Bills Due 03/28/2019 [Member]
Investment Owned
Maturity face value	$ 10,597,500
Due date	Mar. 28, 2019
Fixed Income Securities [Member] | Government and Agency Obligations [Member] | United States [Member] | U.S. Treasury Bills [Member] | U.S. Treasury Bills Due 02/22/2018 [Member]
Investment Owned
Maturity face value		$ 20,192,500
Due date		Feb. 22, 2018
Fixed Income Securities [Member] | Government and Agency Obligations [Member] | United States [Member] | U.S. Treasury Bills [Member] | U.S. Treasury Bills Due 03/29/2018 [Member]
Investment Owned
Maturity face value		$ 26,182,500
Due date		Mar. 29, 2018
Fixed Income Securities [Member] | Government and Agency Obligations [Member] | United States [Member] | U.S. Treasury Bills [Member] | U.S. Treasury Bills Due 04/26/2018 [Member]
Investment Owned
Maturity face value		$ 7,800,000
Due date		Apr. 26, 2018
Short Term Investments [Member]
Investment Owned
Cost	$ 2,208	$ 7,756
Short Term Investments [Member] | Money Market Funds [Member] | United States [Member]
Investment Owned
Cost	$ 2,208	$ 7,756