FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details Textual) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Percentage Of Management Fee In Average Daily Total Net Assets | 0.75% | ||
| Estimated Investor Tax Reporting Cost | $ 174,000 | $ 140,000 | $ 133,000 |
| Percentage Of Fees and Other Waivers Expense | 0.15% | ||
| Expenses Write Off | $ 190,095 | ||
| BNO [Member] | |||
| Estimated Directors Fees and Expenses | 11,565 | 10,575 | 9,150 |
| BNO and Related Public Fund [Member] | |||
| Estimated Directors Fees and Expenses | $ 582,050 | $ 569,303 | $ 567,863 |