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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2015
Percentage Of Management Fee In Average Daily Total Net Assets 0.75%bno_PercentageOfManagementFeeInAverageDailyTotalNetAssets
Estimated Investor Tax Reporting Cost $ 133,000bno_EstimatedInvestorTaxReportingCost
Percentage Of Fees and Other Waivers Expense 0.15%bno_PercentageOfFeesAndOtherWaiversExpense
Expenses Write Off 27,677bno_ExpensesWriteOff
BNO [Member]  
Estimated Directors Fees and Expenses 9,253bno_EstimatedDirectorsFeesAndExpenses
/ invest_InvestmentIdentifierSchemeAxis
= bno_BnoMember
BNO and Related Public Fund [Member]  
Estimated Directors Fees and Expenses $ 560,625bno_EstimatedDirectorsFeesAndExpenses
/ invest_InvestmentIdentifierSchemeAxis
= bno_BnoAndRelatedPublicFundMember