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QUARTERLY FINANCIAL DATA (Unaudited) (Quarterly Financial Information Presents The Results Of Operations) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Total income (loss)	$ (4,674,704)us-gaap_Revenues	$ (1,333,315)us-gaap_Revenues	$ 59,752us-gaap_Revenues	$ 2,154,963us-gaap_Revenues	$ 2,450,824us-gaap_Revenues	$ (352,278)us-gaap_Revenues	$ (2,870,767)us-gaap_Revenues	$ 5,182,801us-gaap_Revenues	$ (3,793,304)us-gaap_Revenues	$ 4,410,580us-gaap_Revenues	$ (4,462,964)us-gaap_Revenues
Total expenses	50,602us-gaap_OperatingExpenses	75,491us-gaap_OperatingExpenses	85,090us-gaap_OperatingExpenses	96,400us-gaap_OperatingExpenses	104,839us-gaap_OperatingExpenses	94,831us-gaap_OperatingExpenses	100,767us-gaap_OperatingExpenses	121,121us-gaap_OperatingExpenses	307,583us-gaap_OperatingExpenses	421,558us-gaap_OperatingExpenses	434,731us-gaap_OperatingExpenses
Expense waivers	(10,778)unl_ExpenseWaiver	(39,383)unl_ExpenseWaiver	(40,700)unl_ExpenseWaiver	(38,045)unl_ExpenseWaiver	(37,562)unl_ExpenseWaiver	(30,231)unl_ExpenseWaiver	(18,323)unl_ExpenseWaiver	(14,464)unl_ExpenseWaiver	(128,906)unl_ExpenseWaiver	(100,580)unl_ExpenseWaiver	(68,503)unl_ExpenseWaiver
Net expenses	39,824unl_NetOperatingExpenses	36,108unl_NetOperatingExpenses	44,390unl_NetOperatingExpenses	58,355unl_NetOperatingExpenses	67,277unl_NetOperatingExpenses	64,600unl_NetOperatingExpenses	82,444unl_NetOperatingExpenses	106,657unl_NetOperatingExpenses	178,677unl_NetOperatingExpenses	320,978unl_NetOperatingExpenses	366,228unl_NetOperatingExpenses
Net income (loss)	$ (4,714,528)us-gaap_NetIncomeLoss	$ (1,369,423)us-gaap_NetIncomeLoss	$ 15,362us-gaap_NetIncomeLoss	$ 2,096,608us-gaap_NetIncomeLoss	$ 2,383,547us-gaap_NetIncomeLoss	$ (416,878)us-gaap_NetIncomeLoss	$ (2,953,211)us-gaap_NetIncomeLoss	$ 5,076,144us-gaap_NetIncomeLoss	$ (3,971,981)us-gaap_NetIncomeLoss	$ 4,089,602us-gaap_NetIncomeLoss	$ (4,829,192)us-gaap_NetIncomeLoss
Net income (loss) per share	$ (4.35)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (1.52)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (0.07)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 1.31us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 1.41us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (0.30)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (2.07)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 2.05us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (4.63)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 1.09us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (3.98)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax

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