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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partner [Member]
Net income (loss) $ 27,633,527    
Net asset value, beginning of period at Dec. 31, 2015 $ 12.22    
Net asset value, end of period at Sep. 30, 2016 $ 14.59    
Balances, at Dec. 31, 2016 $ 113,023,072 $ 0 $ 113,023,072
Addition of 3,150,000 partnership shares 40,082,469 0 40,082,469
Redemption of 4,000,000 partnership shares (54,622,077) 0 (54,622,077)
Net income (loss) (2,018,371) 0 (2,018,371)
Balances, at Sep. 30, 2017 $ 96,465,093 $ 0 $ 96,465,093
Net asset value, beginning of period at Dec. 31, 2016 $ 15.7    
Net asset value, end of period at Sep. 30, 2017 $ 15.19