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Statements of Operations (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	$ 2,205,950us-gaap_GainLossOnSaleOfInvestments	$ 2,395,300us-gaap_GainLossOnSaleOfInvestments	$ (12,161,650)us-gaap_GainLossOnSaleOfInvestments
Change in unrealized gain (loss) on open positions	(6,009,940)us-gaap_UnrealizedGainLossOnInvestments	1,996,630us-gaap_UnrealizedGainLossOnInvestments	7,676,740us-gaap_UnrealizedGainLossOnInvestments
Dividend income	2,798us-gaap_DividendIncomeOperating	4,719us-gaap_DividendIncomeOperating	4,189us-gaap_DividendIncomeOperating
Interest income	2,288us-gaap_InterestIncomeOperating	4,481us-gaap_InterestIncomeOperating	7,257us-gaap_InterestIncomeOperating
ETF transaction fees	5,600us-gaap_FeesAndCommissions	9,450us-gaap_FeesAndCommissions	10,500us-gaap_FeesAndCommissions
Total income (loss)	(3,793,304)us-gaap_Revenues	4,410,580us-gaap_Revenues	(4,462,964)us-gaap_Revenues
Expenses
General Partner management fees (Note 3)	143,944us-gaap_AssetManagementCosts	250,075us-gaap_AssetManagementCosts	283,719us-gaap_AssetManagementCosts
Professional fees	150,833us-gaap_ProfessionalFees	150,502us-gaap_ProfessionalFees	125,273us-gaap_ProfessionalFees
Brokerage commissions	3,918us-gaap_FloorBrokerageExchangeAndClearanceFees	8,360us-gaap_FloorBrokerageExchangeAndClearanceFees	14,360us-gaap_FloorBrokerageExchangeAndClearanceFees
Directors' fees and insurance	6,009us-gaap_NoninterestExpenseDirectorsFees	7,620us-gaap_NoninterestExpenseDirectorsFees	5,705us-gaap_NoninterestExpenseDirectorsFees
License fees	2,879us-gaap_LicenseCosts	5,001us-gaap_LicenseCosts	5,674us-gaap_LicenseCosts
Total expenses	307,583us-gaap_OperatingExpenses	421,558us-gaap_OperatingExpenses	434,731us-gaap_OperatingExpenses
Expense waiver (Note 3)	(128,906)unl_ExpenseWaiver	(100,580)unl_ExpenseWaiver	(68,503)unl_ExpenseWaiver
Net expenses	178,677unl_NetOperatingExpenses	320,978unl_NetOperatingExpenses	366,228unl_NetOperatingExpenses
Net income (loss)	$ (3,971,981)us-gaap_NetIncomeLoss	$ 4,089,602us-gaap_NetIncomeLoss	$ (4,829,192)us-gaap_NetIncomeLoss
Net income (loss) per limited partnership share	$ (4.63)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 1.09us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (3.98)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Net income (loss) per weighted average limited partnership share	$ (3.85)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	$ 2.19us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	$ (2.26)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted
Weighted average limited partnership shares outstanding	1,031,781us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding	1,866,712us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding	2,132,514us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding

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