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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner
Limited Partners
Net income (loss) $ (21,042,667)    
Net asset value, beginning of period at Dec. 31, 2016 $ 20.39    
Net asset value, end of period at Jun. 30, 2017 $ 16.79    
Beginning Balances at Dec. 31, 2017 $ 91,553,902 $ 0 $ 91,553,902
Redemption of 950,000 partnership shares (21,338,077) 0 (21,338,077)
Net income (loss) 16,027,645 0 16,027,645
Ending Balances at Jun. 30, 2018 $ 86,243,470 $ 0 $ 86,243,470
Net asset value, beginning of period at Dec. 31, 2017 $ 21.05    
Net asset value, end of period at Jun. 30, 2018 $ 25.37