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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partner [Member]
Net income (loss) $ (17,395,702)    
Net asset value, beginning of period at Dec. 31, 2016 $ 15.70    
Net asset value, end of period at Jun. 30, 2017 $ 12.97    
Balances, at December 31, 2017 at Dec. 31, 2017 $ 94,548,873 $ 0 $ 94,548,873
Addition of 600,000 partnership shares 12,284,480 0 12,284,480
Redemption of 1,050,000 partnership shares (20,178,900) 0 (20,178,900)
Net income (loss) 18,857,204 0 18,857,204
Balances, at June 30, 2018 at Jun. 30, 2018 $ 105,511,657 $ 0 $ 105,511,657
Net asset value, beginning of period at Dec. 31, 2017 $ 18.18    
Net asset value, end of period at Jun. 30, 2018 $ 22.21