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Condensed Statement of Changes in Partners' Capital - USD ($)
General Partner [Member]
Limited Partner [Member]
Total
Net asset value, beginning of year at Dec. 31, 2017     $ 18.18
Net income (loss)     $ 23,563,473
Net asset value, end of year at Sep. 30, 2018     $ 23.28
Beginning Balances at Dec. 31, 2018 $ 0 $ 73,624,628 $ 73,624,628
Net asset value, beginning of year at Dec. 31, 2018     $ 15.18
Addition of partnership shares 0 17,034,820 $ 17,034,820
Redemption of partnership shares 0 (28,827,507) (28,827,507)
Net income (loss) 0 15,071,039 15,071,039
Ending Balances at Sep. 30, 2019 $ 0 $ 76,902,980 $ 76,902,980
Net asset value, end of year at Sep. 30, 2019     $ 18.09