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Fees Paid By The Fund And Related Party Transactions (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Percentage Of Management Fee In Average Daily Total Net Assets 0.75%    
Estimated Directors Fees and Expenses $ 555,465 $ 540,586 $ 607,582
Estimated Investor Tax Reporting Cost 110,000 75,000 75,000
Percentage Of Fees and Other Waivers Expense 0.15%    
Expenses Write Off 80,563    
BNO [Member]
      
Estimated Directors Fees and Expenses $ 9,012 $ 9,844 $ 4,953