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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Values of Derivative Instruments    
Asset Derivatives $ 5,103,822 $ 5,623,607
Liability Derivatives (1,733,649) (2,004,385)
Futures Contracts    
Fair Values of Derivative Instruments    
Asset Derivatives 1,385,860 2,952,613
Liability Derivatives (984,053) (1,225,072)
Fair Value 401,807 1,727,541
Futures Contracts | Agriculturals    
Fair Values of Derivative Instruments    
Asset Derivatives 201,399 137,471
Liability Derivatives (45,915) (21,434)
Fair Value $ 155,484 $ 116,037
Futures Contracts | Agriculturals | Deutsche Bank Total Return Swap Terminating April 30, 2024    
Fair Values of Derivative Instruments    
Sector exposure index 3.00%  
Futures Contracts | Agriculturals | Deutsche Bank Total Return Swap Terminating March 29, 2019    
Fair Values of Derivative Instruments    
Sector exposure index   4.00%
Futures Contracts | Currencies    
Fair Values of Derivative Instruments    
Asset Derivatives $ 77,837 $ 319,952
Liability Derivatives (71,524) (279,232)
Fair Value 6,313 40,720
Futures Contracts | Energy    
Fair Values of Derivative Instruments    
Asset Derivatives 399,221 213,143
Liability Derivatives (314,480) (29,596)
Fair Value $ 84,741 $ 183,547
Futures Contracts | Energy | Deutsche Bank Total Return Swap Terminating April 30, 2024    
Fair Values of Derivative Instruments    
Sector exposure index 3.00%  
Futures Contracts | Energy | Deutsche Bank Total Return Swap Terminating March 29, 2019    
Fair Values of Derivative Instruments    
Sector exposure index   2.00%
Futures Contracts | Interest rates    
Fair Values of Derivative Instruments    
Asset Derivatives $ 47,095 $ 1,472,305
Liability Derivatives (324,965) (230,289)
Fair Value $ (277,870) $ 1,242,016
Futures Contracts | Interest rates | Deutsche Bank Total Return Swap Terminating April 30, 2024    
Fair Values of Derivative Instruments    
Sector exposure index 46.00%  
Futures Contracts | Interest rates | Deutsche Bank Total Return Swap Terminating March 29, 2019    
Fair Values of Derivative Instruments    
Sector exposure index   58.00%
Futures Contracts | Interest rates | Deutsche Bank Total Return Swap Terminating July 1, 2020    
Fair Values of Derivative Instruments    
Sector exposure index 39.00% 52.00%
Futures Contracts | Meats    
Fair Values of Derivative Instruments    
Asset Derivatives $ 1,715 $ 34,138
Liability Derivatives (5,030) (20,908)
Fair Value (3,315) 13,230
Futures Contracts | Metals    
Fair Values of Derivative Instruments    
Asset Derivatives 277,156 489,925
Liability Derivatives (152,572) (224,143)
Fair Value $ 124,584 $ 265,782
Futures Contracts | Metals | Deutsche Bank Total Return Swap Terminating April 30, 2024    
Fair Values of Derivative Instruments    
Sector exposure index 5.00%  
Futures Contracts | Metals | Deutsche Bank Total Return Swap Terminating March 29, 2019    
Fair Values of Derivative Instruments    
Sector exposure index   1.00%
Futures Contracts | Soft commodities    
Fair Values of Derivative Instruments    
Asset Derivatives $ 56,283 $ 149,703
Liability Derivatives (3,922) (25,803)
Fair Value 52,361 123,900
Futures Contracts | Stock indices    
Fair Values of Derivative Instruments    
Asset Derivatives 325,154 135,976
Liability Derivatives (65,645) (393,667)
Fair Value $ 259,509 $ (257,691)
Futures Contracts | Stock indices | Deutsche Bank Total Return Swap Terminating April 30, 2024    
Fair Values of Derivative Instruments    
Sector exposure index 12.00%  
Futures Contracts | Stock indices | Deutsche Bank Total Return Swap Terminating March 29, 2019    
Fair Values of Derivative Instruments    
Sector exposure index   4.00%
Futures Contracts | Stock indices | Deutsche Bank Total Return Swap Terminating July 1, 2020    
Fair Values of Derivative Instruments    
Sector exposure index 22.00% 15.00%
Forward Contracts    
Fair Values of Derivative Instruments    
Fair Value $ (69,073) $ (41,428)
Forward Contracts | Currencies    
Fair Values of Derivative Instruments    
Asset Derivatives 67,730 142,015
Liability Derivatives (136,803) (183,443)
Fair Value $ (69,073) $ (41,428)
Forward Contracts | Currencies | Deutsche Bank Total Return Swap Terminating April 30, 2024    
Fair Values of Derivative Instruments    
Sector exposure index 31.00%  
Forward Contracts | Currencies | Deutsche Bank Total Return Swap Terminating March 29, 2019    
Fair Values of Derivative Instruments    
Sector exposure index   31.00%
Forward Contracts | Currencies | Deutsche Bank Total Return Swap Terminating July 1, 2020    
Fair Values of Derivative Instruments    
Sector exposure index 39.00% 33.00%
Swap Contracts    
Fair Values of Derivative Instruments    
Asset Derivatives $ 3,650,232 $ 2,528,979
Liability Derivatives (612,793) (595,870)
Fair Value $ 3,037,439 $ 1,933,109
Swap Contracts | Deutsche Bank Total Return Swap Terminating April 30, 2024    
Fair Values of Derivative Instruments    
Sector exposure index 100.00%  
Swap Contracts | Deutsche Bank Total Return Swap Terminating March 29, 2019    
Fair Values of Derivative Instruments    
Sector exposure index   100.00%
Swap Contracts | Deutsche Bank Total Return Swap Terminating July 1, 2020    
Fair Values of Derivative Instruments    
Sector exposure index 100.00% 100.00%