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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner
Limited Partners
Net income (loss) $ 18,181,911    
Net asset value, beginning of year at Dec. 31, 2015 $ 17.00    
Net asset value, end of year at Sep. 30, 2016 $ 18.75    
Beginning Balances at Dec. 31, 2016 $ 126,387,808 $ 0 $ 126,387,808
Addition of 1,300,000 partnership shares 22,440,164 0 22,440,164
Redemption of 1,650,000 partnership shares (30,491,652) 0 (30,491,652)
Net income (loss) (11,209,791) 0 (11,209,791)
Ending Balances at Sep. 30, 2017 $ 107,126,529 $ 0 $ 107,126,529
Net asset value, beginning of year at Dec. 31, 2016 $ 20.39    
Net asset value, end of year at Sep. 30, 2017 $ 18.31