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CONTRACTS AND AGREEMENTS - Additional Information (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / Transaction
Dec. 31, 2019
$ / Transaction
Annual Fee Payable For Transfer Agency Services $ 20,000  
Maximum [Member]    
Transaction fees per transaction | $ / Transaction 15  
Commission Per Round Turn $ 8  
Minimum [Member]    
Annual Fee Payable For Transfer Agency Services 75,000  
Transaction fees per transaction | $ / 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] | Maximum [Member]    
Fee percentage 10.00%  
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member] | Minimum [Member]    
Base amount for determining fee percentage $ 3,000,000,000