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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Values of Derivative Instruments      
Asset Derivatives $ 5,682,718 $ 6,975,930 $ 6,127,320
Liability Derivatives $ (3,418,962) $ (3,126,332) (4,581,389)
Agriculturals | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index 3.00% 3.00%  
Energy | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index 5.00% 3.00%  
Interest rates | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index 68.00% 54.00%  
Interest rates | Deutsche Bank Total Return Swap Terminating July 1, 2020      
Fair Values of Derivative Instruments      
Sector exposure index 46.00% 44.00%  
Metals | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index 2.00% 4.00%  
Stock indices | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index 5.00% 16.00%  
Stock indices | Deutsche Bank Total Return Swap Terminating July 1, 2020      
Fair Values of Derivative Instruments      
Sector exposure index 11.00% 14.00%  
Futures Contracts      
Fair Values of Derivative Instruments      
Asset Derivatives $ 3,172,216 $ 5,223,195 5,166,127
Liability Derivatives (2,531,690) (2,578,536) (2,886,203)
Fair Value 640,526 2,644,659 2,279,924
Futures Contracts | Agriculturals      
Fair Values of Derivative Instruments      
Asset Derivatives 74,110 192,152 121,013
Liability Derivatives (84,983) (41,963) (261,721)
Fair Value (10,873) $ 150,189 $ (140,708)
Futures Contracts | Agriculturals | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index   3.00% 3.00%
Futures Contracts | Currencies      
Fair Values of Derivative Instruments      
Asset Derivatives 214,555 $ 607,592 $ 763,565
Liability Derivatives (224,284) (214,009) (345,781)
Fair Value (9,729) 393,583 417,784
Futures Contracts | Energy      
Fair Values of Derivative Instruments      
Asset Derivatives 581,547 1,202,346 562,341
Liability Derivatives (64,603) (156,581) (18,461)
Fair Value 516,944 $ 1,045,765 $ 543,880
Futures Contracts | Energy | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index   3.00% 1.00%
Futures Contracts | Interest rates      
Fair Values of Derivative Instruments      
Asset Derivatives 972,293 $ 480,661 $ 578,244
Liability Derivatives (482,616) (820,436) (326,726)
Fair Value 489,677 $ (339,775) $ 251,518
Futures Contracts | Interest rates | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index   54.00% 53.00%
Futures Contracts | Interest rates | Deutsche Bank Total Return Swap Terminating July 1, 2020      
Fair Values of Derivative Instruments      
Sector exposure index   44.00% 61.00%
Futures Contracts | Meats      
Fair Values of Derivative Instruments      
Asset Derivatives 82,091 $ 37,013 $ 79,821
Liability Derivatives (2,708) (5,967) (10,487)
Fair Value 79,383 31,046 69,334
Futures Contracts | Metals      
Fair Values of Derivative Instruments      
Asset Derivatives 512,038 1,464,763 1,604,965
Liability Derivatives (824,941) (828,583) (1,282,731)
Fair Value (312,903) $ 636,180 $ 322,234
Futures Contracts | Metals | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index   4.00% 3.00%
Futures Contracts | Soft commodities      
Fair Values of Derivative Instruments      
Asset Derivatives 524,236 $ 371,081 $ 344,652
Liability Derivatives (57,668) (161,787) (86,579)
Fair Value 466,568 209,294 258,073
Futures Contracts | Stock indices      
Fair Values of Derivative Instruments      
Asset Derivatives 211,346 867,587 1,111,526
Liability Derivatives (789,887) (349,210) (553,717)
Fair Value (578,541) $ 518,377 $ 557,809
Futures Contracts | Stock indices | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index   16.00% 15.00%
Futures Contracts | Stock indices | Deutsche Bank Total Return Swap Terminating July 1, 2020      
Fair Values of Derivative Instruments      
Sector exposure index   14.00% 10.00%
Forward Contracts      
Fair Values of Derivative Instruments      
Fair Value 149,098 $ 25,627 $ 705
Forward Contracts | Currencies      
Fair Values of Derivative Instruments      
Asset Derivatives 397,363 573,423 556,627
Liability Derivatives (248,265) (547,796) (555,922)
Fair Value $ 149,098 $ 25,627 $ 705
Forward Contracts | Currencies | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index 17.00% 20.00% 25.00%
Forward Contracts | Currencies | Deutsche Bank Total Return Swap Terminating July 1, 2020      
Fair Values of Derivative Instruments      
Sector exposure index 43.00% 42.00% 29.00%
Swap Contracts      
Fair Values of Derivative Instruments      
Asset Derivatives $ 2,113,139 $ 1,179,312 $ 404,566
Liability Derivatives (639,007)   (1,139,264)
Fair Value $ 1,474,132 $ 1,179,312 $ (734,698)
Swap Contracts | Deutsche Bank Total Return Swap Terminating March 29, 2019      
Fair Values of Derivative Instruments      
Sector exposure index 100.00% 100.00% 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% 100.00%