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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Percentage Of Management Fee In Average Daily Total Net Assets 0.75%  
Percentage Of Fees and Other Waivers Expense 0.15%  
Expenses Write Off $ 59,168  
Scenario, Forecast [Member]    
Estimated Investor Tax Reporting Cost   $ 165,000
BNO [Member] | Scenario, Forecast [Member]    
Estimated Directors Fees and Expenses   15,500
BNO and Related Public Fund [Member] | Scenario, Forecast [Member]    
Estimated Directors Fees and Expenses   $ 536,000