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Statements of Changes in Partners' Capital - USD ($)
General Partner [Member]
Limited Partner [Member]
Total
Beginning Balances at Dec. 31, 2016 $ 0 $ 113,023,072 $ 113,023,072
Net asset value, beginning of year at Dec. 31, 2016     $ 15.70
Addition of partnership shares 0 40,082,469 $ 40,082,469
Redemption of partnership shares 0 (74,007,758) (74,007,758)
Net income (loss) 0 15,451,090 15,451,090
Ending Balances at Dec. 31, 2017 0 94,548,873 $ 94,548,873
Net asset value, end of year at Dec. 31, 2017     $ 18.18
Addition of partnership shares 0 41,996,934 $ 41,996,934
Redemption of partnership shares 0 (47,730,785) (47,730,785)
Net income (loss) 0 (15,190,394) (15,190,394)
Ending Balances at Dec. 31, 2018 0 73,624,628 $ 73,624,628
Net asset value, end of year at Dec. 31, 2018     $ 15.18
Addition of partnership shares 0 17,034,820 $ 17,034,820
Redemption of partnership shares 0 (32,720,529) (32,720,529)
Net income (loss) 0 26,763,267 26,763,267
Ending Balances at Dec. 31, 2019 $ 0 $ 84,702,186 $ 84,702,186
Net asset value, end of year at Dec. 31, 2019     $ 20.91