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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partner [Member]
Net asset value, beginning of year at Dec. 31, 2017 $ 18.18    
Net income (loss) $ 4,562,389    
Net asset value, end of year at Mar. 31, 2018 $ 19.13    
Beginning Balances at Dec. 31, 2018 $ 73,624,628 $ 0 $ 73,624,628
Net asset value, beginning of year at Dec. 31, 2018 $ 15.18    
Addition of partnership shares $ 7,937,858 0 7,937,858
Redemption of partnership shares (7,298,509) 0 (7,298,509)
Net income (loss) 19,896,460 0 19,896,460
Ending Balances at Mar. 31, 2019 $ 94,160,437 $ 0 $ 94,160,437
Net asset value, end of year at Mar. 31, 2019 $ 19.22