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Statements of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Balances, at Dec. 31, 2014 $ 41,419,390 $ 0 $ 41,419,390
Addition of partnership shares 123,526,846 0 123,526,846
Redemption of partnership shares (38,808,966) 0 (38,808,966)
Net income (loss) (43,645,160) 0 (43,645,160)
Balances, at Dec. 31, 2015 $ 82,492,110 0 82,492,110
Net asset value, beginning of year at Dec. 31, 2014 $ 22.39    
Net asset value, end 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
Balances, at Dec. 31, 2016 $ 113,023,072 0 113,023,072
Net asset value, end of year at Dec. 31, 2016 $ 15.7    
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
Balances, at Dec. 31, 2017 $ 94,548,873 $ 0 $ 94,548,873
Net asset value, end of year at Dec. 31, 2017 $ 18.18