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CONTRACTS AND AGREEMENTS (Details Textual) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Description Of Marketing Agent Fee The fee of the Marketing Agent, which is borne by USCF, is equal to 0.06% on USBO''s assets up to $3 billion and 0.04% on USBO''s assets in excess of $3 billion.  
Minimum Amount Of Custody,Fund Accounting and Fund Administration Services Payable $ 75,000  
Annual Fee Payable For Transfer Agency Services 20,000  
Description Of Comibined Net Asset Based Charges (a) 0.06% for the 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 assets, (b) 0.0465% for 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, and (c) 0.035% once 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. The annual minimum amount will not apply if the asset-based charge for all accounts in the aggregate exceeds $75,000. USCF also pays transaction fees ranging from $7 to $15 per transaction.  
Minimum Transaction Fees Payable 7  
Maximum Transaction Fees Payable 15  
Commission Per Round Turn $ 7 $ 15