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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Net income (loss) $ 11,097,621    
Net asset value, beginning of period at Dec. 31, 2017 [1] $ 23.34    
Net asset value, end of period at Mar. 31, 2018 $ 22.54    
Balances at Dec. 31, 2018 $ 248,014,523 $ 0 $ 248,014,523
Addition of partnership shares 271,042,716 0 271,042,716
Redemption of partnership shares (263,511,539) 0 (263,511,539)
Net income (loss) (662,758) 0 (662,758)
Balances at Mar. 31, 2019 $ 254,882,942 $ 0 $ 254,882,942
Net asset value, beginning of period at Dec. 31, 2018 $ 24.35
Net asset value, end of period at Mar. 31, 2019 $ 23.42
[1] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.