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Statements of Changes in Partners' Capital - USD ($)
Total
General Partner
Limited Partners
Net Asset Value Per Share:      
Net asset value per share $ 17.00    
Beginning Balances at Dec. 31, 2015 $ 70,533,597 $ 0 $ 70,533,597
Addition of partnership shares 56,075,976 0 56,075,976
Redemption of partnership shares (29,595,130) 0 (29,595,130)
Net income (loss) 29,373,365 0 29,373,365
Ending Balances at Dec. 31, 2016 $ 126,387,808 0 126,387,808
Net Asset Value Per Share:      
Net asset value per share $ 20.39    
Addition of partnership shares $ 22,440,164 0 22,440,164
Redemption of partnership shares (58,996,025) 0 (58,996,025)
Net income (loss) 1,721,955 0 1,721,955
Ending Balances at Dec. 31, 2017 $ 91,553,902 0 91,553,902
Net Asset Value Per Share:      
Net asset value per share $ 21.05    
Redemption of partnership shares $ (35,247,245) 0 (35,247,245)
Net income (loss) (5,508,027) 0 (5,508,027)
Ending Balances at Dec. 31, 2018 $ 50,798,630 $ 0 $ 50,798,630
Net Asset Value Per Share:      
Net asset value per share $ 17.82