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CONTRACTS AND AGREEMENTS (Details Textual) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Annual Fee Payable For Transfer Agency Services     $ 20,000  
Brokerage commissions 6,739 8,739 23,029 25,880
Rebalancing Cost     19,736 17,220
Creation and Redemption Activity Costs     3,293 8,660
Percentage Of Average Daily Assets Net Total     0.07% 0.06%
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 USBO's, USOF's, USNG's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USCI's, CPER's, USAG's and USMI's combined net asset [Member]
        
Fee percentage     0.06%  
First $500 million of USBO's, USOF's, USNG's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USCI's, CPER's, USAG's and USMI's combined net asset [Member] | Maximum [Member]
        
Base amount for determining fee percentage 500,000,000   500,000,000  
USBO's, USOF's, USNG's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USCI's, CPER's USAG's and USMI's combined net assets greater than $500 million but less than $1 billion [Member]
        
Fee percentage     0.0465%  
USBO's, USOF's, USNG's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USCI's, CPER's USAG's and USMI's 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   1,000,000,000  
USBO's, USOF's, USNG's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USCI's, CPER's USAG's and USMI's combined net assets greater than $500 million but less than $1 billion [Member] | Minimum [Member]
        
Base amount for determining fee percentage 500,000,000   500,000,000  
USBO's, USOF's, USNG's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion [Member]
        
Fee percentage     0.035%  
USBO's, USOF's, USNG's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion [Member] | Minimum [Member]
        
Base amount for determining fee percentage 1,000,000,000   1,000,000,000  
Marketing Agreement [Member] | US12NG's assets up to $3 billion [Member]
        
Fee percentage     0.06%  
Base amount for determining fee percentage 3,000,000,000   3,000,000,000  
Marketing Agreement [Member] | US12NG's assets in excess of $3 billion [Member]
        
Fee percentage     0.04%  
Base amount for determining fee percentage $ 3,000,000,000   $ 3,000,000,000