United States Short Oil Fund 10-Q 13 May 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Registrant Name	United States Short Oil Fund, LP
Entity Central Index Key	1439567
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Trading Symbol	DNO
Entity Common Stock, Shares Outstanding	0

Condensed_Statements_of_Financ

Condensed Statements of Financial Condition (USD $)	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents (Notes 2 and 5)	$12,870,727	$8,697,839
Equity in trading accounts:
Cash and cash equivalents	2,109,660	1,111,493
Unrealized gain (loss) on open commodity futures contracts	497,040	1,328,190
Receivable from General Partner (Note 3)	21,816	93,807
Dividends receivable	43	0
Directors' fees and insurance receivable	1,533	1,048
Total assets	15,500,819	11,232,377
Liabilities and Partners' Capital
Professional fees payable	68,546	90,341
General Partner management fees payable (Note 3)	7,698	5,142
License fees payable	551	329
Brokerage commissions payable	1,202	572
Total liabilities	77,997	96,384
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital
General Partner	0	0
Limited Partners	15,422,822	11,135,993
Total Partners' Capital	15,422,822	11,135,993
Total liabilities and partners' capital	$15,500,819	$11,232,377
Limited Partners' shares outstanding	250,000	200,000
Net asset value per share	$61.69	$55.68
Market value per share	$61.89	$55.16

Condensed_Schedule_of_Investme

Condensed Schedule of Investments (USD $)	Mar. 31, 2015
Unrealized Gain (Loss) on Open Commodity Contracts	$497,040
Open Futures Contracts, Short [Member] | United States Contracts [Member] | NYMEX WTI Crude Oil Futures CL May 2015 contracts, expiring April 2015 [Member]
Number of Contracts	324	[1]
Unrealized Gain (Loss) on Open Commodity Contracts	497,040	[1]
% of Partners' Capital	3.22%	[1]
Cash Equivalents [Member]
Market Value	6,999,187
% of Partners' Capital	45.38%
Cash Equivalents [Member] | US Treasury Securities [Member]
Market Value	3,999,187
% of Partners' Capital	25.93%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.10%, 6/25/2015 [Member]
Principal Amount	1,000,000
Market Value	999,776
% of Partners' Capital	6.48%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.08%, 7/23/2015 [Member]
Principal Amount	1,000,000
Market Value	999,765
% of Partners' Capital	6.48%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.08%, 9/03/2015 [Member]
Principal Amount	1,000,000
Market Value	999,677
% of Partners' Capital	6.48%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.05%, 4/23/2015 [Member]
Principal Amount	1,000,000
Market Value	999,969
% of Partners' Capital	6.49%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Fund, Government Portfolio [Member]
Principal Amount	3,000,000
Market Value	$3,000,000
% of Partners' Capital	19.45%
[1]	Collateral amounted to $2,109,660 on open futures contracts.

Condensed_Schedule_of_Investme1

Condensed Schedule of Investments (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015
Collateral Amount On Open Futures Contracts	2,109,660
US Treasury Securities [Member] | Cash Equivalents [Member] | U.S. Treasury Bills 0.10%, 6/25/2015 [Member]
Interest rate	0.10%
Expiration date	6/25/15
US Treasury Securities [Member] | Cash Equivalents [Member] | U.S. Treasury Bills 0.08%, 7/23/2015 [Member]
Interest rate	0.08%
Expiration date	7/23/15
US Treasury Securities [Member] | Cash Equivalents [Member] | U.S. Treasury Bills 0.08%, 9/03/2015 [Member]
Interest rate	0.08%
Expiration date	9/3/15
U.S. Treasury Bills 0.05%, 4/23/2015 [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.05%
Expiration date	4/23/15
United States [Member] | NYMEX WTI Crude Oil Futures CL May 2015 contracts, expiring April 2015 [Member] | Open Futures Contracts, Short [Member]
Expiration date	Apr-15

Condensed_Statements_of_Operat

Condensed Statements of Operations (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	$1,932,100	($477,360)
Change in unrealized gain (loss) on open positions	-831,150	-44,240
Dividend income	43	148
Interest income	1,179	751
ETF transaction fees	1,050	350
Total income (loss)	1,103,222	-520,351
Expenses
General Partner management fees (Note 3)	21,314	16,367
Professional fees	16,407	22,575
Brokerage commissions	9,563	2,485
Directors' fees and insurance	712	803
License fees	533	409
Total expenses	48,529	42,639
Expense waiver (Note 3)	-21,797	-18,490
Net expenses	26,732	24,149
Net income (loss)	$1,076,490	($544,500)
Net income (loss) per limited partnership share	$6.01	($1.64)
Net income (loss) per weighted average limited partnership share	$4.45	($1.67)
Weighted average limited partnership shares outstanding	241,667	326,111

Condensed_Statement_of_Changes

Condensed Statement of Changes in Partners' Capital (USD $)	Total	General Partner [Member]	Limited Partner [Member]
Balances at Dec. 31, 2014	$11,135,993	$0	$11,135,993
Net asset value, beginning of year at Dec. 31, 2014	$55.68
Addition of 100,000 partnership shares	6,132,741	0	6,132,741
Redemption of 50,000 partnership shares	-2,922,402	0	-2,922,402
Net income (loss)	1,076,490	0	1,076,490
Balances at Mar. 31, 2015	$15,422,822	$0	$15,422,822
Net asset value, end of year at Mar. 31, 2015	$61.69

Condensed_Statement_of_Changes1

Condensed Statement of Changes in Partners' Capital (Parenthetical)	3 Months Ended
	Mar. 31, 2015
Addition partnership shares, shares	100,000
Redemption of partnership shares, shares	50,000

Condensed_Statements_of_Cash_F

Condensed Statements of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net income (loss)	$1,076,490	($544,500)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Increase) decrease in commodity futures trading account - cash and cash equivalents	-998,167	-119,154
Unrealized (gain) loss on open futures contracts	831,150	44,240
(Increase) decrease in receivable from General Partner	71,991	60,309
(Increase) decrease in dividends receivable	-43	-1
(Increase) decrease in directors' fees and insurance receivable	-485	-1,717
Increase (decrease) in professional fees payable	-21,795	-87,628
Increase (decrease) in General Partner management fees payable	2,556	105
Increase (decrease) in license fees payable	222	-183
Increase (decrease) in brokerage commissions payable	630	0
Net cash provided by (used in) operating activities	962,549	-648,529
Cash Flows from Financing Activities:
Addition of partnership shares	6,132,741	1,680,789
Redemption of partnership shares	-2,922,402	0
Net cash provided by (used in) financing activities	3,210,339	1,680,789
Net Increase (Decrease) in Cash and Cash Equivalents	4,172,888	1,032,260
Cash and Cash Equivalents, beginning of period	8,697,839	9,739,154
Cash and Cash Equivalents, end of period	$12,870,727	$10,771,414

Organization_and_Business

Organization and Business	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION AND BUSINESS	NOTE 1 — ORGANIZATION AND BUSINESS
	The United States Short Oil Fund, LP (“DNO”) was organized as a limited partnership under the laws of the state of Delaware on June 30, 2008. DNO is a commodity pool that issues limited partnership shares (“shares”) that may be purchased and sold on the NYSE Arca, Inc. (the “NYSE Arca”). DNO will continue in perpetuity, unless terminated sooner upon the occurrence of one or more events as described in its Second Amended and Restated Agreement of Limited Partnership dated as of March 1, 2013 (the “LP Agreement”). The investment objective of DNO is for the daily changes in percentage terms of its shares’ per share net asset value (“NAV”) to inversely reflect the daily changes in percentage terms of the spot price of West Texas Intermediate (“WTI”) light, sweet crude oil delivered to Cushing, Oklahoma, as measured by the daily changes in the price of the futures contract for WTI light, sweet crude oil traded on the New York Mercantile Exchange (the “NYMEX”) that is the near month contract to expire, except when the near month contract is within two weeks of expiration, in which case the futures contract will be the next month contract to expire (the “Benchmark Futures Contract”), less DNO’s expenses. It is not the intent of DNO to be operated in a fashion such that the per share NAV will equal, in dollar terms, the inverse of the spot price of WTI light, sweet crude oil or any particular futures contract based on WTI light, sweet crude oil. It is not the intent of DNO to be operated in a fashion such that its per share NAV will reflect the inverse of the percentage change of the price of any particular futures contract as measured over a time period greater than one day. United States Commodity Funds LLC (“USCF”), the general partner of DNO, believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in short positions in Futures Contracts (as defined below) and Other Crude Oil-Related Investments (as defined below). DNO accomplishes its objective through investments in short positions in futures contracts for WTI light, sweet crude oil and other types of crude oil, diesel-heating oil, gasoline, natural gas and other petroleum-based fuels that are traded on the NYMEX, ICE Futures Exchange (“ICE Futures”) or other U.S. and foreign exchanges (collectively, “Futures Contracts”) and other oil-related investments such as cash-settled options on Futures Contracts, forward contracts for oil, cleared swap contracts and over-the-counter (“OTC”) transactions that are based on the price of crude oil, diesel-heating oil, gasoline, natural gas and other petroleum-based fuels, Futures Contracts and indices based on the foregoing (collectively, “Other Crude Oil-Related Investments”). As of March 31, 2015, DNO held short positions in 324 WTI Crude Oil Futures CL Contracts traded on the NYMEX and did not hold short positions on the ICE Futures.
	DNO commenced investment operations on September 24, 2009 and has a fiscal year ending on December 31. USCF is responsible for the management of DNO. USCF is a member of the National Futures Association (the “NFA”) and became a commodity pool operator registered with the Commodity Futures Trading Commission (the “CFTC”) effective December 1, 2005 and a swaps firm on August 8, 2013. USCF is also the general partner of the United States Oil Fund, LP (“USO”), the United States Natural Gas Fund, LP (“UNG”), the United States 12 Month Oil Fund, LP (“USL”), the United States Gasoline Fund, LP (“UGA”) and the United States Diesel-Heating Oil Fund, LP (“UHN”), which listed their limited partnership shares on the American Stock Exchange (the “AMEX”) under the ticker symbols “USO” on April 10, 2006, “UNG” on April 18, 2007, “USL” on December 6, 2007, “UGA” on February 26, 2008 and “UHN” on April 9, 2008, respectively. As a result of the acquisition of the AMEX by NYSE Euronext, each of USO’s, UNG’s, USL’s, UGA’s and UHN’s shares commenced trading on the NYSE Arca on November 25, 2008. USCF is also the general partner of the United States 12 Month Natural Gas Fund, LP (“UNL”) and the United States Brent Oil Fund, LP (“BNO”), which listed their limited partnership shares on the NYSE Arca under the ticker symbols “UNL” on November 18, 2009 and “BNO” on June 2, 2010, respectively. USCF is also the sponsor of the United States Commodity Index Fund (“USCI”), the United States Copper Index Fund (“CPER”) and the United States Agriculture Index Fund (“USAG”), each a series of the United States Commodity Index Funds Trust. USCI, CPER and USAG listed their shares on the NYSE Arca under the ticker symbol “USCI” on August 10, 2010, “CPER” on November 15, 2011 and “USAG” on April 13, 2012, respectively. All funds listed previously are referred to collectively herein as the “Related Public Funds.”
	DNO issues shares to certain authorized purchasers (“Authorized Participants”) by offering baskets consisting of 50,000 shares (“Creation Baskets”) through ALPS Distributors, Inc., as the marketing agent (the “Marketing Agent”). The purchase price for a Creation Basket is based upon the NAV of a share calculated shortly after the close of the core trading session on the NYSE Arca on the day the order to create the basket is properly received.
	The applicable transaction fee paid by Authorized Participants is $350 to DNO for each order they place to create one or more Creation Baskets or to redeem one or more baskets (“Redemption Baskets”). Shares may be purchased or sold on a nationally recognized securities exchange in smaller increments than a Creation Basket or Redemption Basket. Shares purchased or sold on a nationally recognized securities exchange are not purchased or sold at the per share NAV of DNO but rather at market prices quoted on such exchange.
	In September 2009, DNO initially registered 25,000,000 shares on Form S-1 with the U.S. Securities and Exchange Commission (the “SEC”). On September 24, 2009, DNO listed its shares on the NYSE Arca under the ticker symbol “DNO”. On that day, DNO established its initial per share NAV by setting the price at $50 and issued 200,000 shares in exchange for $10,000,000. DNO also commenced investment operations on September 24, 2009, by taking short positions in Futures Contracts traded on the NYMEX based on WTI light, sweet crude oil. As of March 31, 2015, DNO had registered a total of 25,000,000 shares.
	The accompanying unaudited condensed financial statements have been prepared in accordance with Rule 10-01 of Regulation S-X promulgated by the SEC and, therefore, do not include all information and footnote disclosure required under generally accepted accounting principles (“GAAP”) in the United States of America. The financial information included herein is unaudited; however, such financial information reflects all adjustments, consisting only of normal recurring adjustments, which are, in the opinion of USCF, necessary for the fair presentation of the condensed financial statements for the interim period.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Summary Of Significant Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	NOTE 2 — SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation
	The financial statements have been prepared in conformity with GAAP as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification.  DNO is an investment company and follows the accounting and reporting guidance in FASB Topic 946.
	Revenue Recognition
	Commodity futures contracts, forward contracts, physical commodities and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the condensed statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the condensed financial statements. Changes in the unrealized gains or losses between periods are reflected in the condensed statements of operations. DNO earns interest on its assets denominated in U.S. dollars on deposit with the futures commission merchant (“FCM”) at the 90-day Treasury bill rate. In addition, DNO earns income on funds held at the custodian or FCM at prevailing market rates earned on such investments.
	Brokerage Commissions
	Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.
	Income Taxes
	DNO is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return.
	In accordance with GAAP, DNO is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. DNO files an income tax return in the U.S. federal jurisdiction, and may file income tax returns in various U.S. states. DNO is not subject to income tax return examinations by major taxing authorities for years before 2011. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in DNO recording a tax liability that reduces net assets. However, DNO’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. DNO recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the period ended March 31, 2015.
	Creations and Redemptions
	Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed.
	DNO receives or pays the proceeds from shares sold or redeemed within three business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in DNO’s condensed statements of financial condition as receivable for shares sold, and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed.
	Authorized Participants pay DNO a fee of $350 for each order placed to create one or more Creation Baskets or to redeem one or more Redemption Baskets.
	Partnership Capital and Allocation of Partnership Income and Losses
	Profit or loss shall be allocated among the partners of DNO in proportion to the number of shares each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement.
	Calculation of Per Share Net Asset Value (“NAV”)
	DNO’s per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. DNO uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange.
	Net Income (Loss) Per Share
	Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. There were no shares held by USCF at March 31, 2015.
	Offering Costs
	Offering costs incurred in connection with the registration of additional shares after the initial registration of shares are borne by DNO. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.
	Cash Equivalents
	Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of three months or less.
	Reclassification
	Certain amounts in the accompanying condensed financial statements were reclassified to conform to the current presentation.
	Use of Estimates
	The preparation of condensed financial statements in conformity with GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

Fees_Paid_by_the_Fund_and_Rela

Fees Paid by the Fund and Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Fees Paid and Related Party Transactions Disclosure [Abstract]
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS	NOTE 3 — FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
	USCF Management Fee
	Under the LP Agreement, USCF is responsible for investing the assets of DNO in accordance with the objectives and policies of DNO. In addition, USCF has arranged for one or more third parties to provide administrative, custody, accounting, transfer agency and other necessary services to DNO. For these services, DNO is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets.
	Ongoing Registration Fees and Other Offering Expenses
	DNO pays all costs and expenses associated with the ongoing registration of its shares subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of shares, and all legal, accounting, printing and other expenses associated with such offer and sale. For the three months ended March 31, 2015 and 2014, DNO did not incur any registration fees or other offering expenses.
	Directors’ Fees and Expenses
	DNO is responsible for paying its portion of the directors’ and officers’ liability insurance for DNO and the Related Public Funds and the fees and expenses of the independent directors who also serve as audit committee members of DNO and the Related Public Funds. DNO shares the fees and expenses on a pro rata basis with each Related Public Fund, as described above, based on the relative assets of each Related Public Fund computed on a daily basis. These fees and expenses for the year ending December 31, 2015 are estimated to be a total of $2,545 for DNO and $560,625 for DNO and the Related Public Funds.
	Licensing Fees
	DNO and the Related Public Funds, other than BNO, USCI, CPER and USAG, pay a licensing fee that is equal to 0.015% on all net assets. During the three months ended March 31, 2015 and 2014, DNO incurred $533 and $409, respectively, under this arrangement.
	Investor Tax Reporting Cost
	The fees and expenses associated with DNO’s audit expenses and tax accounting and reporting requirements are paid by DNO. These costs are estimated to be $68,000 for the year ending December 31, 2015.
	Other Expenses and Fees and Expense Waivers
	In addition to the fees described above, DNO pays all brokerage fees and other expenses in connection with the operation of DNO, excluding costs and expenses paid by USCF as outlined in Note 4 – Contracts and Agreements below. USCF has voluntarily agreed to pay certain expenses normally borne by DNO to the extent that such expenses exceed 0.15% (15 basis points) of DNO’s NAV, on an annualized basis, through at least June 30, 2015. USCF has no obligation to continue such payments into subsequent periods. For the three months ended March 31, 2015, USCF waived $21,797 of DNO’s expenses. This voluntary expense waiver is in addition to those amounts USCF is contractually obligated to pay as described in Note 4 – Contracts and Agreements.

Contracts_and_Agreements

Contracts and Agreements	3 Months Ended
	Mar. 31, 2015
Contracts and Agreements [Abstract]
CONTRACTS AND AGREEMENTS	NOTE 4 — CONTRACTS AND AGREEMENTS
	DNO is party to a marketing agent agreement, dated as of June 8, 2009, as amended from time to time, with the Marketing Agent and USCF, whereby the Marketing Agent provides certain marketing services for DNO as outlined in the agreement. The fee of the Marketing Agent, which is borne by USCF, is equal to 0.06% on DNO’s assets up to $3 billion; and 0.04% on DNO’s assets in excess of $3 billion. In no event may the aggregate compensation paid to the Marketing Agent and any affiliate of USCF for distribution related services exceed 10% of the gross proceeds of DNO’s offering.
	The above fee does not include website construction and development, which are borne by USCF.
	DNO is also party to a custodian agreement, dated October 7, 2008, as amended from time to time, with Brown Brothers Harriman & Co. (“BBH&Co.”) and USCF, whereby BBH&Co. holds investments on behalf of DNO. USCF pays the fees of the custodian, which are determined by the parties from time to time. In addition, DNO is party to an administrative agency agreement, dated October 7, 2008, as amended from time to time, with USCF and BBH&Co., whereby BBH&Co. acts as the administrative agent, transfer agent and registrar for DNO. USCF also pays the fees of BBH&Co. for its services under such agreement and such fees are determined by the parties from time to time.
	Currently, USCF pays BBH&Co. for its services, in the foregoing capacities, a minimum amount of $75,000 annually for its custody, fund accounting and fund administration services rendered to DNO and each of the Related Public Funds, as well as a $20,000 annual fee for its transfer agency services. In addition, USCF pays BBH&Co. an asset-based charge of: (a) 0.06% for the first $500 million of the Related Public Funds’ combined net assets, (b) 0.0465% for the Related Public Funds’ combined net assets greater than $500 million but less than $1 billion, and (c) 0.035% the Related Public Funds’ 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.
	On October 8, 2013, DNO entered into a brokerage agreement with RBC Capital Markets, LLC (“RBC Capital” or “RBC”) to serve as DNO’s FCM, effective October 10, 2013.  Prior to October 10, 2013, the FCM was UBS Securities LLC. The agreement with RBC requires it to provide services to DNO in connection with the purchase and sale of Futures Contracts and Other Crude Oil-Related Investments that may be purchased and sold by or through RBC Capital and/or UBS Securities for DNO’s account. In accordance with the agreement, RBC Capital charges DNO commissions of approximately $7 to $15 per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts. Such fees include those incurred when purchasing Futures Contracts and options on Futures Contracts when DNO issues shares as a result of a Creation Basket, as well as fees incurred when selling Futures Contracts and options on Futures Contracts when DNO redeems shares as a result of a Redemption Basket. Such fees are also incurred when Futures Contracts and options on Futures Contracts are purchased or redeemed for the purpose of rebalancing the portfolio. DNO also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Crude Oil-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”).
		For the three months ended			For the three months ended
		March 31, 2015			March 31, 2014
	Total commissions accrued to brokers	$	9,563		$	2,485
	Total commissions as an annualized percentage of average net assets		0.28	%		0.09	%
	Commissions accrued as a result of rebalancing	$	9,228		$	2,431
	Percentage of commissions accrued as a result of rebalancing		96.5	%		97.83	%
	Commissions accrued as a result of creation and redemption activity	$	335		$	54
	Percentage of commissions accrued as a result of creation and redemption activity		3.5	%		2.17	%
	The increase in the total commissions accrued to brokers for the three months ended March 31, 2015, as compared to the three months ended March 31, 2014, was a result of increased brokerage fees due to a higher number of futures contracts being held and traded as a result of DNO’s greater size as measured by total net assets.
	DNO and the NYMEX entered into a licensing agreement on May 22, 2009, as amended on October 20, 2011, whereby DNO was granted a non-exclusive license to use certain of the NYMEX’s settlement prices and service marks. Under the licensing agreement, DNO and the Related Public Funds, other than BNO, USCI, CPER and USAG, pay the NYMEX an asset-based fee for the license, the terms of which are described in Note 3. DNO expressly disclaims any association with the NYMEX or endorsement of DNO by the NYMEX and acknowledges that “NYMEX” and “New York Mercantile Exchange” are registered trademarks of the NYMEX.

Financial_Instruments_OffBalan

Financial Instruments, Off-Balance Sheet Risks and Contingencies	3 Months Ended
	Mar. 31, 2015
Disclosure Of Fair Value Off Balance Sheet Risks [Abstract]
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES	NOTE 5 — FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES
	DNO engages in the trading of futures contracts and options on futures contracts and may engage in cleared swaps (collectively, “derivatives”). DNO is exposed to both market risk, which is the risk arising from changes in the market value of the contracts, and credit risk, which is the risk of failure by another party to perform according to the terms of a contract.
	DNO may enter into futures contracts, options on futures contracts and cleared swaps to gain exposure to changes in the value of an underlying commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of a commodity at a specified time and place. Some futures contracts may call for physical delivery of the asset, while others are settled in cash. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery. Cleared swaps are OTC agreements that are eligible to be cleared by a clearinghouse, e.g., ICE Clear Europe, but which are not traded on an exchange. A cleared swap is created when the parties to an off-exchange OTC swap transaction agree to extinguish their OTC contract and replace it with a cleared swap. Cleared swaps are intended to provide the efficiencies and benefits that centralized clearing on an exchange offers to traders of futures contracts, including credit risk intermediation and the ability to offset positions initiated with different counterparties.
	The purchase and sale of futures contracts, options on futures contracts and cleared swaps require margin deposits with a FCM. Additional deposits may be necessary for any loss on contract value. The Commodity Exchange Act requires a FCM to segregate all customer transactions and assets from the FCM’s proprietary activities.
	Futures contracts, options on futures contracts and cleared swaps involve, to varying degrees, elements of market risk (specifically commodity price risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure DNO has in the particular classes of instruments. Additional risks associated with the use of futures contracts are an imperfect correlation between movements in the price of the futures contracts and the market value of the underlying securities and the possibility of an illiquid market for a futures contract. Buying and selling options on futures contracts exposes investors to the risks of purchasing or selling futures contracts.
	All of the futures contracts held by DNO were exchange-traded through March 31, 2015. The risks associated with exchange-traded contracts are generally perceived to be less than those associated with OTC transactions since, in OTC transactions, a party must rely solely on the credit of its respective individual counterparties. However, in the future, if DNO were to enter into non-exchange traded contracts, it would be subject to the credit risk associated with counterparty non-performance. The credit risk from counterparty non-performance associated with such instruments is the net unrealized gain, if any, on the transaction. DNO has credit risk under its futures contracts since the sole counterparty to all domestic and foreign futures contracts is the clearinghouse for the exchange on which the relevant contracts are traded. In addition, DNO bears the risk of financial failure by the clearing broker.
	DNO’s cash and other property, such as Treasuries, deposited with a FCM are considered commingled with all other customer funds, subject to the FCM’s segregation requirements. In the event of a FCM’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The insolvency of a FCM could result in the complete loss of DNO’s assets posted with that FCM; however, the majority of DNO’s assets are held in Treasuries, cash and/or cash equivalents with DNO’s custodian and would not be impacted by the insolvency of a FCM. The failure or insolvency of DNO’s custodian, however, could result in a substantial loss of DNO’s assets.
	USCF invests a portion of DNO’s cash in money market funds that seek to maintain a stable per share NAV. DNO is exposed to any risk of loss associated with an investment in such money market funds. As of March 31, 2015, DNO held investments in money market funds in the amount of $3,000,000. By comparison, as of December 31, 2014 DNO did not hold investments in money market funds. DNO also holds cash deposits with its custodian. Pursuant to a written agreement with BBH&Co., uninvested overnight cash balances are swept to offshore branches of U.S. regulated and domiciled banks located in Toronto, Canada; London, United Kingdom; Grand Cayman, Cayman Islands; and Nassau, Bahamas; which are subject to U.S. regulation and regulatory oversight. As of March 31, 2015 and December 31, 2014, DNO held cash deposits and investments in Treasuries in the amounts of $11,980,387 and $9,809,332, respectively, with the custodian and FCM. Some or all of these amounts may be subject to loss should DNO’s custodian and/or FCM cease operations.
	For derivatives, risks arise from changes in the market value of the contracts. Theoretically, DNO is exposed to market risk equal to the value of futures contracts purchased and unlimited liability on such contracts sold short. As both a buyer and a seller of options, DNO pays or receives a premium at the outset and then bears the risk of unfavorable changes in the price of the contract underlying the option.
	DNO’s policy is to continuously monitor its exposure to market and counterparty risk through the use of a variety of financial, position and credit exposure reporting controls and procedures. In addition, DNO has a policy of requiring review of the credit standing of each broker or counterparty with which it conducts business.
	The financial instruments held by DNO are reported in its condensed statements of financial condition at market or fair value, or at carrying amounts that approximate fair value, because of their highly liquid nature and short-term maturity.

Financial_Highlights

Financial Highlights	3 Months Ended
	Mar. 31, 2015
Supplemental Financial In Formation Disclosure [Abstract]
FINANCIAL HIGHLIGHTS	NOTE 6 — FINANCIAL HIGHLIGHTS
	The following table presents per share performance data and other supplemental financial data for the three months ended March 31, 2015 and 2014 for the shareholders. This information has been derived from information presented in the condensed financial statements.
		For the three			For the three
		months ended			months ended
		March 31, 2015			March 31, 2014
		(Unaudited)			(Unaudited)
	Per Share Operating Performance:
	Net asset value, beginning of period	$	55.68		$	34.23
	Total income (loss)		6.12			-1.57
	Net expenses		-0.11			-0.07
	Net increase (decrease) in net asset value		6.01			-1.64
	Net asset value, end of period	$	61.69		$	32.59
	Total Return		10.79	%		-4.79	%
	Ratios to Average Net Assets
	Total income (loss)		7.66	%		-4.7	%
	Management fees*		0.6	%		0.6	%
	Total expenses excluding management fees*		0.77	%		0.96	%
	Expenses waived*		-0.62	%		-0.68	%
	Net expenses excluding management fees*		0.15	%		0.28	%
	Net income (loss)		7.47	%		-4.92	%
	*  Annualized
	Total returns are calculated based on the change in value during the period. An individual shareholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from DNO.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2015

Fair Value Of Financial Instruments [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

NOTE 7 — FAIR VALUE OF FINANCIAL INSTRUMENTS

DNO values its investments in accordance with Accounting Standards Codification 820 – Fair Value Measurements and Disclosures (“ASC 820”). ASC 820 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurement. The changes to past practice resulting from the application of ASC 820 relate to the definition of fair value, the methods used to measure fair value, and the expanded disclosures about fair value measurement. ASC 820 establishes a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of DNO (observable inputs) and (2) DNO’s own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the ASC 820 hierarchy are as follows:

Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs).

Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available.

In some instances, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls shall be determined based on the lowest input level that is significant to the fair value measurement in its entirety.

The following table summarizes the valuation of DNO’s securities at March 31, 2015 using the fair value hierarchy:

At March 31, 2015

Total

Level I

Level II

Level III

Short-Term Investments

$

6,999,187

$

6,999,187

$

—

$

—

Exchange-Traded Futures Contracts

United States Contracts

497,040

497,040

—

—

During the three months ended March 31, 2015, there were no transfers between Level I and Level II.

The following table summarizes the valuation of DNO’s securities at December 31, 2014 using the fair value hierarchy:

At December 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

$

2,999,297

$

2,999,297

$

—

$

—

Exchange-Traded Futures Contracts

United States Contracts

1,328,190

1,328,190

—

—

During the year ended December 31, 2014, there were no transfers between Level I and Level II.

Effective January 1, 2009, DNO adopted the provisions of Accounting Standards Codification 815 – Derivatives and Hedging, which require presentation of qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts and gains and losses on derivatives.

Fair Value of Derivative Instruments

Derivatives not

Accounted for as

Condensed

Hedging

Statements of Financial

Fair Value

Fair Value

Instruments

Condition Location

At March 31, 2015

At December 31, 2014

Futures – Commodity Contracts

Assets

$

497,040

$

1,328,190

The Effect of Derivative Instruments on the Condensed Statements of Operations

For the three months ended

For the three months ended

March 31, 2015

March 31, 2014

Change in

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain (Loss)

Gain (Loss)

Gain (Loss)

Gain (Loss)

Gain (Loss)

Accounted for as

on Derivatives

on Derivatives

on Derivatives

on Derivatives

on Derivatives

Hedging

Recognized in

Recognized in

Recognized in

Recognized in

Recognized in

Instruments

Income

Income

Income

Income

Income

Futures – Commodity Contracts

Realized gain (loss) on closed contracts

$

1,932,100

$

-477,360

Change in unrealized gain (loss) on open contracts

$

-831,150

$

-44,420

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	NOTE 8 — SUBSEQUENT EVENTS
	DNO has performed an evaluation of subsequent events through the date the condensed financial statements were issued. This evaluation did not result in any subsequent events that necessitated disclosures and/or adjustments, other than as noted below:
	Mr. Howard Mah, Management Director, Chief Financial Officer (Principal Accounting Officer), Secretary and Treasurer of USCF, general partner of United States Short Oil Fund, LP, tendered his resignation effective May 15, 2015. It is anticipated that Mr. Stuart Crumbaugh, who was hired by USCF on April 6, 2015, will be appointed the Chief Financial Officer (Principal Accounting Officer), Secretary and Treasurer effective May 15, 2015 (concurrently with the Board of Directors’ accepting Mr. Mah’s resignation).

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Summary Of Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	The financial statements have been prepared in conformity with GAAP as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification.  DNO is an investment company and follows the accounting and reporting guidance in FASB Topic 946.
Revenue Recognition	Revenue Recognition
	Commodity futures contracts, forward contracts, physical commodities and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the condensed statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the condensed financial statements. Changes in the unrealized gains or losses between periods are reflected in the condensed statements of operations. DNO earns interest on its assets denominated in U.S. dollars on deposit with the futures commission merchant (“FCM”) at the 90-day Treasury bill rate. In addition, DNO earns income on funds held at the custodian or FCM at prevailing market rates earned on such investments.
Brokerage Commissions	Brokerage Commissions
	Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.
Income Taxes	Income Taxes
	DNO is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return.
	In accordance with GAAP, DNO is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. DNO files an income tax return in the U.S. federal jurisdiction, and may file income tax returns in various U.S. states. DNO is not subject to income tax return examinations by major taxing authorities for years before 2011. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in DNO recording a tax liability that reduces net assets. However, DNO’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. DNO recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the period ended March 31, 2015.
Creations and Redemptions	Creations and Redemptions
	Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed.
	DNO receives or pays the proceeds from shares sold or redeemed within three business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in DNO’s condensed statements of financial condition as receivable for shares sold, and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed.
	Authorized Participants pay DNO a fee of $350 for each order placed to create one or more Creation Baskets or to redeem one or more Redemption Baskets.
Partnership Capital and Allocation of Partnership Income and Losses	Partnership Capital and Allocation of Partnership Income and Losses
	Profit or loss shall be allocated among the partners of DNO in proportion to the number of shares each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement.
Calculation of Per Share Net Asset Value	Calculation of Per Share Net Asset Value (“NAV”)
	DNO’s per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. DNO uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange.
Net Income (Loss) Per Share	Net Income (Loss) Per Share
	Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. There were no shares held by USCF at March 31, 2015.
Offering Costs	Offering Costs
	Offering costs incurred in connection with the registration of additional shares after the initial registration of shares are borne by DNO. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.
Cash Equivalents	Cash Equivalents
	Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of three months or less.
Reclassification	Reclassification
	Certain amounts in the accompanying condensed financial statements were reclassified to conform to the current presentation.
Use of Estimates	Use of Estimates
	The preparation of condensed financial statements in conformity with GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

Contracts_and_Agreements_Table

Contracts and Agreements (Tables)	3 Months Ended
	Mar. 31, 2015
Contracts and Agreements [Abstract]
Brokerage Commissions	DNO also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Crude Oil-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”).
		For the three months ended			For the three months ended
		March 31, 2015			March 31, 2014
	Total commissions accrued to brokers	$	9,563		$	2,485
	Total commissions as an annualized percentage of average net assets		0.28	%		0.09	%
	Commissions accrued as a result of rebalancing	$	9,228		$	2,431
	Percentage of commissions accrued as a result of rebalancing		96.5	%		97.83	%
	Commissions accrued as a result of creation and redemption activity	$	335		$	54
	Percentage of commissions accrued as a result of creation and redemption activity		3.5	%		2.17	%

Financial_Highlights_Tables

Financial Highlights (Tables)	3 Months Ended
	Mar. 31, 2015
Supplemental Financial In Formation Disclosure [Abstract]
Per Unit Performance Data and Other Supplemental Financial Data	The following table presents per share performance data and other supplemental financial data for the three months ended March 31, 2015 and 2014 for the shareholders. This information has been derived from information presented in the condensed financial statements.
		For the three			For the three
		months ended			months ended
		March 31, 2015			March 31, 2014
		(Unaudited)			(Unaudited)
	Per Share Operating Performance:
	Net asset value, beginning of period	$	55.68		$	34.23
	Total income (loss)		6.12			-1.57
	Net expenses		-0.11			-0.07
	Net increase (decrease) in net asset value		6.01			-1.64
	Net asset value, end of period	$	61.69		$	32.59
	Total Return		10.79	%		-4.79	%
	Ratios to Average Net Assets
	Total income (loss)		7.66	%		-4.7	%
	Management fees*		0.6	%		0.6	%
	Total expenses excluding management fees*		0.77	%		0.96	%
	Expenses waived*		-0.62	%		-0.68	%
	Net expenses excluding management fees*		0.15	%		0.28	%
	Net income (loss)		7.47	%		-4.92	%
	*  Annualized

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Of Financial Instruments [Abstract]

Valuation of Securities Using Fair Value Hierarchy

The following table summarizes the valuation of DNO’s securities at March 31, 2015 using the fair value hierarchy:

At March 31, 2015

Total

Level I

Level II

Level III

Short-Term Investments

$

6,999,187

$

6,999,187

$

—

$

—

Exchange-Traded Futures Contracts

United States Contracts

497,040

497,040

—

—

During the three months ended March 31, 2015, there were no transfers between Level I and Level II.

The following table summarizes the valuation of DNO’s securities at December 31, 2014 using the fair value hierarchy:

At December 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

$

2,999,297

$

2,999,297

$

—

$

—

Exchange-Traded Futures Contracts

United States Contracts

1,328,190

1,328,190

—

—

Fair Value of Derivative Instruments

Fair Value of Derivative Instruments

Derivatives not

Accounted for as

Condensed

Hedging

Statements of Financial

Fair Value

Fair Value

Instruments

Condition Location

At March 31, 2015

At December 31, 2014

Futures – Commodity Contracts

Assets

$

497,040

$

1,328,190

Effect of Derivative Instruments on the Condensed Statements of Operations

The Effect of Derivative Instruments on the Condensed Statements of Operations

For the three months ended

For the three months ended

March 31, 2015

March 31, 2014

Change in

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain (Loss)

Gain (Loss)

Gain (Loss)

Gain (Loss)

Gain (Loss)

Accounted for as

on Derivatives

on Derivatives

on Derivatives

on Derivatives

on Derivatives

Hedging

Recognized in

Recognized in

Recognized in

Recognized in

Recognized in

Instruments

Income

Income

Income

Income

Income

Futures – Commodity Contracts

Realized gain (loss) on closed contracts

$

1,932,100

$

-477,360

Change in unrealized gain (loss) on open contracts

$

-831,150

$

-44,420

Organization_and_Business_Addi

Organization and Business (Additional Information) (Detail) (USD $)	1 Months Ended
	Sep. 24, 2009	Sep. 30, 2009	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission		25,000,000
Net asset value per unit	$50		$61.69	$55.68	$32.59	$34.23
Number of units issued	200,000
Value of units issued	$10,000,000
Commenced investment operations date	24-Sep-09
Number of registered units			25,000,000
Creation Baskets [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of Shares per basket			50,000
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets			350

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Additional Information) (Detail)	3 Months Ended
	Mar. 31, 2015
Maximum [Member]
Significant Accounting Policies [Line Items]
Cash equivalents maturity period	3 months
Creation Baskets [Member]
Significant Accounting Policies [Line Items]
Number of Shares per basket	50,000
Fee Paid Per Order	350

Fees_Paid_by_the_Fund_and_Rela1

Fees Paid by the Fund and Related Party Transactions (Additional Information) (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2015
Fees Paid and Related Party Transactions [Line Items]
USCF Management Fee	DNO is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets.
Estimated directors fees and expenses	$712	$803
Licensing fee incurred	533	409
Costs and expenses annual limit for reimbursement	0.15%
Expense Waivers	21,797
Subsequent Event [Member]
Fees Paid and Related Party Transactions [Line Items]
Estimated investor tax reporting cost	68,000
DNO and the Related Public Funds [Member] | Subsequent Event [Member]
Fees Paid and Related Party Transactions [Line Items]
Estimated directors fees and expenses			560,625
Licensing Agreements [Member] | On and after October 20, 2011 [Member]
Fees Paid and Related Party Transactions [Line Items]
Fee percentage	0.02%
Assets basis for determining fee percentage	on all net assets
DNO [Member] | Subsequent Event [Member]
Fees Paid and Related Party Transactions [Line Items]
Estimated directors fees and expenses			$2,545

Contracts_and_Agreements_Broke

Contracts and Agreements (Brokerage Commissions) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]
Brokerage commissions	$9,563	$2,485
Percentage of average daily net assets	0.28%	0.09%
Rebalancing Investments Transaction [Member]
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]
Brokerage commissions	9,228	2,431
Percentage of average daily net assets	96.50%	97.83%
Trades Necessitated By Creation And Redemption Activity [Member]
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]
Brokerage commissions	$335	$54
Percentage of average daily net assets	3.50%	2.17%

Contracts_and_Agreements_Addit

Contracts and Agreements (Additional Information) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$1,000,000,000
Annual Fee for transfer agency services	20,000
Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	75,000
Transaction fees per transaction	15
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts	15
Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual Fee for custody, fund accounting and fund administration services	75,000
Transaction fees per transaction	7
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts	7
First $500 million of USSO's, USOF's, USNG's, US12OF's, UGA's, USHO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
Base amount for determining fee percentage	500,000,000
DNO's, USOF's, USNG's, US12OF's, UGA's, USHO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than 500 million but less than 1 billion[Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.05%
Base amount for determining fee percentage	500,000,000
DNO's, USOF's, USNG's, US12OF's, UGA's, USHO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets exceed 1 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.04%
Base amount for determining fee percentage	1,000,000,000
Marketing Agreement [Member] | USSO's assets up to $3 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
Marketing Agreement [Member] | USSO's assets in excess of $3 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.04%
Base amount for determining fee percentage	3,000,000,000
Marketing Agreement [Member] | DNO's assets in excess of 3 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$3,000,000,000

Financial_Instruments_OffBalan1

Financial Instruments, Off-Balance Sheet Risks and Contingencies (Additional Information) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]
Cash investments in money market funds	$3,000,000
Deposits in domestic and foreign financial institutions	$11,980,387	$9,809,332

Financial_Highlights_Per_Unit_

Financial Highlights (Per Unit Performance Data and Other Supplemental Financial Data) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Sep. 24, 2009
Per Share Operating Performance:
Net asset value, beginning of year	$55.68		$34.23		$50
Total income (loss)	$6.12		($1.57)
Net expenses	($0.11)		($0.07)
Net increase (decrease) in net asset value	$6.01		($1.64)
Net asset value, end of year	$61.69		$32.59		$50
Total Return	10.79%		-4.79%
Ratios to Average Net Assets
Total income (loss)	7.66%		-4.70%
Management fees	0.60%	[1]	0.60%	[1]
Total expenses excluding management fees	0.77%	[1]	0.96%	[1]
Expenses waived	-0.62%	[1]	-0.68%	[1]
Net expenses excluding management fees	0.15%	[1]	0.28%	[1]
Net income (loss)	7.47%		-4.92%
[1]	Annualized

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Valuation of Securities Using Fair Value Hierarchy) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$6,999,187	$2,999,297
Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	497,040	1,328,190
Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	6,999,187	2,999,297
Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	497,040	1,328,190
Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$0	$0

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments (Fair Value of Derivative Instruments) (Detail) (Commodity Contracts [Member], Futures [Member], Assets [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
Commodity Contracts [Member] | Futures [Member] | Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives not accounted for as hedging instruments	$497,040	$1,328,190

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments (Effect of Derivative Instruments on Condensed Statements of Operations) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	$1,932,100	($477,360)
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	-831,150	-44,240
Commodity Contracts [Member] | Futures [Member] | Realized loss on closed positions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	1,932,100	-477,360
Commodity Contracts [Member] | Futures [Member] | Change in unrealized loss on open positions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	($831,150)	($44,420)