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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Percentage Of Management Fee In Average Daily Total Net Assets | 0.75% |  |
Estimated Investor Tax Reporting Cost | $ 90,200 | $ 111,000 | $ 190,000
Percentage Of Fees and Other Waivers Expense | 0.15% |  |
Expenses Write Off | $ 80,032 |  |
BNO [Member] |  |  |
Estimated Directors Fees and Expenses | 19,301 | 15,970 | 13,325
BNO and Related Public Fund [Member] |  |  |
Estimated Directors Fees and Expenses | $ 556,951 | $ 521,689 | $ 536,375

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- Details
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- Details
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