XML 43 R26.htm IDEA: XBRL DOCUMENT v3.3.1.900
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Percentage Of Management Fee In Average Daily Total Net Assets 0.75%    
Estimated Directors Fees and Expenses   $ 567,863 $ 555,465
Estimated Investor Tax Reporting Cost $ 140,000 133,000 110,000
Percentage Of Fees and Other Waivers Expense 0.15%    
Expenses Write Off $ 135,317    
BNO [Member]      
Estimated Directors Fees and Expenses 10,575 $ 9,150 $ 9,012
BNO and Related Public Fund [Member]      
Estimated Directors Fees and Expenses $ 569,303