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Statements of Cash Flows (Parenthetical) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of Cash and Cash Equivalents:      
Cash and Cash Equivalents $ 42,728,472 $ 83,241,625 $ 117,373,323
Equity in Trading Accounts:      
Cash and Cash Equivalents 24,000,253 4,988,459 6,997,275
Total Cash, Cash Equivalents and Equity in Trading Accounts $ 66,728,725 $ 88,230,084 $ 124,370,598