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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2021
Percentage of management fee in average daily total net assets     0.75%    
Registration fees and offering expenses $ 64,610 $ 81,500 $ 128,510 $ 81,500  
Estimated investor tax reporting cost     334,000    
Expenses write off     $ 202,151    
Forecast [Member]          
Percentage of fees and other waivers expense         0.15%
BNO [Member] | Forecast [Member]          
Estimated directors fees and expenses         $ 77,000
BNO and Related Public Fund [Member] | Forecast [Member]          
Estimated directors fees and expenses         $ 1,061,000