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Statements of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partner [Member]
Beginning Balances at Dec. 31, 2015 $ 82,492,110 $ 0 $ 82,492,110
Net asset value, beginning of year at Dec. 31, 2015 $ 12.22    
Addition of partnership shares $ 39,802,240 0 39,802,240
Redemption of partnership shares (46,276,406) 0 (46,276,406)
Net income (loss) 37,005,128 0 37,005,128
Ending Balances at Dec. 31, 2016 $ 113,023,072 0 113,023,072
Net asset value, end of year at Dec. 31, 2016 $ 15.70    
Addition of partnership shares $ 40,082,469 0 40,082,469
Redemption of partnership shares (74,007,758) 0 (74,007,758)
Net income (loss) 15,451,090 0 15,451,090
Ending Balances at Dec. 31, 2017 $ 94,548,873 0 94,548,873
Net asset value, end of year at Dec. 31, 2017 $ 18.18    
Addition of partnership shares $ 41,996,934 0 41,996,934
Redemption of partnership shares (47,730,785) 0 (47,730,785)
Net income (loss) (15,190,394) 0 (15,190,394)
Ending Balances at Dec. 31, 2018 $ 73,624,628 $ 0 $ 73,624,628
Net asset value, end of year at Dec. 31, 2018 $ 15.18