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Statements of Financial Condition (Parenthetical) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statements of Financial Condition      
Cash and Cash Equivalents $ 1,026,973,397 $ 1,223,159,803 $ 1,846,630,713
Equity in trading accounts:      
Cash and Cash Equivalents $ 149,272,014 $ 433,776,173 $ 144,626,242