XML 47 R30.htm IDEA: XBRL DOCUMENT v3.20.1
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES - Additional Information (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES    
Cash investments in money market funds $ 13,000,000  
Deposits in domestic and foreign financial institutions $ 38,606,975 $ 66,728,725