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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS - (Additional Information) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fees Paid and Related Party Transactions [Line Items]
USCF Management Fee			UNL is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.75% per annum of average daily total net assets.
Percentage of average daily net assets	0.75%		0.75%
Licensing fee incurred			$ 2,214	$ 3,955
Expense waiver (Note 3)	39,383	30,231	118,128	63,018
Licensing Agreements [Member] | On and after October 20, 2011 [Member]
Fees Paid and Related Party Transactions [Line Items]
Fee percentage			0.015%
Assets basis for determining fee percentage			on all net assets
Future Period - for the year ending December 31, 2014 [Member]
Fees Paid and Related Party Transactions [Line Items]
Estimated investor tax reporting cost			90,000
Future Period - for the year ending December 31, 2014 [Member] | Maximum [Member]
Fees Paid and Related Party Transactions [Line Items]
Costs and expenses annual limit for reimbursement			0.15%
UNL [Member] | Related Public Funds [Member]
Fees Paid and Related Party Transactions [Line Items]
Estimated directors' fees and expenses			$ 560,625

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Base Amount For Fee Percentage

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Base Fee Percentage

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Expense Waiver

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Percentage of Average Daily Net Assets

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Percentage of Change in Costs and Expenses

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Costs incurred and are directly related to generating license revenue. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(e))

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Description of the nature of payments to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP), including the fee rate, basis of calculation, relevant accounting period, whether the fee is paid to an entity other than the managing member or general partner, or whether the fee is waived.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

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Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

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Amount of general expenses not normally included in Other Operating Costs and Expenses.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Number 210

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