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FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES    
Cash investments in money market funds $ 10,000,000 $ 33,700,000
Deposits in domestic and foreign financial institutions $ 283,672,818 $ 326,091,174