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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details Textual) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 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 | $ 78,058 |
Scenario, Forecast [Member] |  |
Estimated Investor Tax Reporting Cost |  | $ 175,000
BNO [Member] | Scenario, Forecast [Member] |  |
Estimated Directors Fees and Expenses |  | 16,300
BNO and Related Public Fund [Member] | Scenario, Forecast [Member] |  |
Estimated Directors Fees and Expenses |  | $ 536,200

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