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Offsetting Assets And Liabilities (Tables)
 3 Months Ended
Mar. 31, 2013
Offsetting Assets And Liabilities [Line Items]  
Offsetting Assets
Offsetting of Financial Assets and Derivative Assets as of March 31, 2013 and December 31, 2012
                   
Assets   Gross Amounts of Recognized Assets     Gross Amounts Offset in the Statements of Financial Condition     Net Amounts of Assets Presented in the Statements of Financial Condition  
                   
At March 31, 2013:                  
Futures contracts   $ 4,053,150     $ –     $ 4,053,150  
                         
At December 31, 2012:                        
Futures contracts   $ 1,816,340     $ –     $ 1,816,340  

 
Offsetting Liabilities
Offsetting of Financial Liabilities and Derivative Liabilities as of March 31, 2013 and December 31, 2012
                   
Liabilities   Gross Amounts of Recognized Liabilities     Gross Amounts Offset in the Statements of Financial Condition     Net Amounts of Liabilities Presented in the Statements of Financial Condition  
                   
At March 31, 2013:                  
Futures contracts   $ 183,680     $ –     $ 183,680  
                         
At December 31, 2012:                        
Futures contracts   $ 259,430     $ –     $ 259,430  
Collateral Held By Counterparty [Member]
  
Offsetting Assets And Liabilities [Line Items]  
Offsetting Assets
Financial Assets, Derivative Assets, and Collateral Held by Counterparty as of March 31, 2013 and December 31, 2012
                         
          Gross Amounts Not Offset in the
Statements of Financial Condition		        
    Net Amounts of
Assets Presented
in the
Statements of
Financial
Condition (A)		     Financial
Instruments
Collateral
Received (B)		     Cash Collateral
Received (C)		     Net Amount
(D) = (A) - (B) - (C)		  
                         
At March 31, 2013:                        
UBS Securities   $ 4,053,150     $ –     $ –     $ 4,053,150  
                                 
At December 31, 2012:                                
UBS Securities   $ 1,816,340     $ –     $ –     $ 1,816,340  
Offsetting Liabilities
Financial Liabilities, Derivative Liabilities, and Collateral Pledged by Counterparty as of March 31, 2013 and December 31, 2012
                         
          Gross Amounts Not Offset in the
Statements of Financial Condition		        
    Net Amounts of
Liabilities
Presented in the
Statements of
Financial
Condition (A)		     Financial
Instruments
Collateral
Pledged (B)		     Cash Collateral
Pledged (C)		     Net Amount
(D) = (A) - (B) - (C)		  
                         
At March 31, 2013:                        
UBS Securities   $ 183,680     $ 131,790     $ 51,890     $ –  
                                 
At December 31, 2012:                                
UBS Securities   $ 259,430     $ 148,454     $ 110,976     $ –