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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partner [Member]
Net income (loss) $ (2,018,371)    
Net asset value, beginning of period at Dec. 31, 2016 $ 15.70    
Net asset value, end of period at Sep. 30, 2017 $ 15.19    
Balances, at December 31, 2017 at Dec. 31, 2017 $ 94,548,873 $ 0 $ 94,548,873
Addition of 1,150,000 partnership shares 23,719,011 0 23,719,011
Redemption of 1,750,000 partnership shares (34,753,669) 0 (34,753,669)
Net income (loss) 23,563,473 0 23,563,473
Balances, at September 30, 2018 at Sep. 30, 2018 $ 107,077,688 $ 0 $ 107,077,688
Net asset value, beginning of period at Dec. 31, 2017 $ 18.18    
Net asset value, end of period at Sep. 30, 2018 $ 23.28