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FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES    
Cash investments in money market funds $ 500,000 $ 1,600,000
Deposits in domestic and foreign financial institutions $ 4,127,798 $ 4,163,922