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Condensed Statements of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net income (loss)	$ (1,341,500)us-gaap_NetIncomeLoss	$ 2,096,608us-gaap_NetIncomeLoss
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	293,433us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities	640,250us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities
Unrealized (gain) loss on futures contracts	(975,025)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts	(508,810)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
(Increase) decrease in receivable from General Partner	48,431us-gaap_IncreaseDecreaseDueFromOfficersAndStockholders	62,535us-gaap_IncreaseDecreaseDueFromOfficersAndStockholders
(Increase) decrease in dividends receivable	0us-gaap_IncreaseDecreaseInDividendsReceivable	384us-gaap_IncreaseDecreaseInDividendsReceivable
(Increase) decrease in directors' fees and insurance receivable	(1,142)unl_IncreaseDecreaseInDirectorsFeeReceivable	(2,323)unl_IncreaseDecreaseInDirectorsFeeReceivable
(Increase) decrease in ETF transaction fees receivable	350us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables	0us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Increase (decrease) in General Partner management fees payable	55unl_IncreaseDecreaseManagementFeesPayable	(4,921)unl_IncreaseDecreaseManagementFeesPayable
Increase (decrease) in professional fees payable	(29,996)unl_IncreaseDecreaseInProfessionalFeesPayable	(103,522)unl_IncreaseDecreaseInProfessionalFeesPayable
Increase (decrease) in license fees payable	(15)unl_IncreaseDecreaseInLicenseFeesPayable	(150)unl_IncreaseDecreaseInLicenseFeesPayable
Net cash provided by (used in) operating activities	(2,005,409)us-gaap_NetCashProvidedByUsedInOperatingActivities	2,180,051us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Financing Activities:
Addition of partnership shares	4,642,159us-gaap_ProceedsFromPartnershipContribution	0us-gaap_ProceedsFromPartnershipContribution
Redemption of partnership shares	(1,990,063)unl_PaymentsToPartnershipRedemption	(8,969,857)unl_PaymentsToPartnershipRedemption
Net cash provided by (used in) financing activities	2,652,096us-gaap_NetCashProvidedByUsedInFinancingActivities	(8,969,857)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net Increase (Decrease) in Cash and Cash Equivalents	646,687us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(6,789,806)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents, beginning of period	15,113,447us-gaap_CashAndCashEquivalentsAtCarryingValue	25,514,584us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, end of period	$ 15,760,134us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 18,724,778us-gaap_CashAndCashEquivalentsAtCarryingValue

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