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Contracts And Agreements (Details Textual) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Annual Fee Payable For Transfer Agency Services $ 20,000  
Percentage Of Average Daily Assets Net Total 0.06% 0.07%
Maximum [Member]
    
Transaction fees per transaction 15  
Commission Per Round Turn 15  
Minimum [Member]
    
Annual Fee Payable For Transfer Agency Services 75,000  
Transaction fees per transaction 7  
Commission Per Round Turn 7  
First $500 Million Of The Related Public Funds' Combined Net Assets [Member]
    
Fee percentage 0.06%  
First $500 Million Of The Related Public Funds' Combined Net Assets [Member] | Maximum [Member]
    
Base amount for determining fee percentage 500,000,000  
Related Public Funds' Combined Net Assets Greater Than $500 Million But Less Than $1 Billion [Member]
    
Fee percentage 0.0465%  
Related Public Funds' Combined Net Assets Greater Than $500 Million But Less Than $1 Billion [Member] | Maximum [Member]
    
Base amount for determining fee percentage 1,000,000,000  
Related Public Funds' Combined Net Assets Greater Than $500 Million But Less Than $1 Billion [Member] | Minimum [Member]
    
Base amount for determining fee percentage 500,000,000  
Related Public Funds' Combined Net Assets Exceed $1 Billion [Member]
    
Fee percentage 0.035%  
Related Public Funds' Combined Net Assets Exceed $1 Billion [Member] | Minimum [Member]
    
Base amount for determining fee percentage 1,000,000,000  
Marketing Agreement [Member] | BNO's assets up to $3 billion [Member]
    
Fee percentage 0.06%  
Marketing Agreement [Member] | BNO's assets up to $3 billion [Member] | Maximum [Member]
    
Base amount for determining fee percentage 3,000,000,000  
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member]
    
Fee percentage 0.04%  
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member] | Minimum [Member]
    
Base amount for determining fee percentage $ 3,000,000,000