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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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 $ 0 $ 157,620 $ 259,150
Investor reporting costs 123,795    
BNO      
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS      
Directors fees and expenses 80,249 82,611 74,951
BNO and other Related Public Funds      
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS      
Directors fees and expenses $ 1,210,000 1,258,000 1,081,963
USL      
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS      
Investor reporting costs   $ 239,277 $ 399,680