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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fees paid by the fund and related party transactions      
Percentage of management fee in average daily total net assets 0.75%    
Registration fees and offering expenses $ 157,620 $ 259,150 $ 234,290
Estimated investor tax reporting cost $ 239,277    
Percentage of fees and other waivers expense 0.15%    
Expenses write off $ 0 202,151 660,603
BNO      
Fees paid by the fund and related party transactions      
Estimated directors fees and expenses 82,611    
Directors fees and expenses   74,951 28,104
BNO and other Related Public Funds      
Fees paid by the fund and related party transactions      
Estimated directors fees and expenses $ 1,258,000    
Directors fees and expenses   1,081,963 585,896
USL      
Fees paid by the fund and related party transactions      
Investor reporting costs   $ 399,680 $ 221,582