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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Percentage Of Management Fee In Average Daily Total Net Assets 0.75%  
Estimated Investor Tax Reporting Cost   $ 130,000
Percentage Of Fees and Other Waivers Expense   0.15%
Expenses Write Off   $ 9,395
BNO [Member]    
Estimated Directors Fees and Expenses   543,500
BNO and Related Public Fund [Member]    
Estimated Directors Fees and Expenses   $ 19,000