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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partner [Member]
Net income (loss) $ 29,316,357    
Net asset value, beginning of period at Dec. 31, 2015 $ 12.22    
Net asset value, end of period at Jun. 30, 2016 $ 14.86    
Balances, at December 31, 2016 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 1,450,000 partnership shares (20,305,297) 0 (20,305,297)
Net income (loss) (17,395,702) 0 (17,395,702)
Balances, at June 30, 2017 at Jun. 30, 2017 $ 115,404,542 $ 0 $ 115,404,542
Net asset value, beginning of period at Dec. 31, 2016 $ 15.7    
Net asset value, end of period at Jun. 30, 2017 $ 12.97