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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Percentage Of Management Fee In Average Daily Total Net Assets 0.75%  
Estimated Investor Tax Reporting Cost   $ 120,000
Percentage Of Fees and Other Waivers Expense   0.15%
Expenses Write Off   $ 6,004
BNO [Member]    
Estimated Directors Fees and Expenses   545,250
BNO and Related Public Fund [Member]    
Estimated Directors Fees and Expenses   $ 21,700