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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Percentage Of Management Fee In Average Daily Total Net Assets 0.75%  
Expenses Write Off $ 56,591  
Forecast [Member]    
Estimated Investor Tax Reporting Cost   $ 160,000
Percentage Of Fees and Other Waivers Expense   0.15%
BNO [Member] | Forecast [Member]    
Estimated Directors Fees and Expenses   $ 30,000
BNO and Related Public Fund [Member] | Forecast [Member]    
Estimated Directors Fees and Expenses   $ 574,000