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FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES - Additional Information (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES    
Cash investments in money market funds $ 235,579,699 $ 13,000,000
Deposits in domestic and foreign financial institutions $ 11,048,528 $ 38,606,975