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CONTRACTS AND AGREEMENTS (Details Textual) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Annual Fee Payable For Transfer Agency Services | $ 20,000 |
Brokerage commissions | 8,402 | 9,947
Rebalancing Cost | 2,163 | 7,967
Creation and Redemption Activity Costs | 6,238 | 1,904
Percentage Of Average Daily Assets Net Total | 0.08% | 0.07%
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 |
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 |
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 |
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 |
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 |
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 |

X
- Definition The annual fee payable for transfer agency services reported during the period. + References No definition available. + Details
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- Definition The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 61 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 60 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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