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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 | $ 59,752 us-gaap_Revenues | $ 2,154,963 us-gaap_Revenues | $ 2,450,824 us-gaap_Revenues | $ (352,278)us-gaap_Revenues | $ (2,870,767)us-gaap_Revenues | $ 5,182,801 us-gaap_Revenues | $ (3,793,304)us-gaap_Revenues | $ 4,410,580 us-gaap_Revenues | $ (4,462,964)us-gaap_Revenues
Total expenses | 50,602 us-gaap_OperatingExpenses | 75,491 us-gaap_OperatingExpenses | 85,090 us-gaap_OperatingExpenses | 96,400 us-gaap_OperatingExpenses | 104,839 us-gaap_OperatingExpenses | 94,831 us-gaap_OperatingExpenses | 100,767 us-gaap_OperatingExpenses | 121,121 us-gaap_OperatingExpenses | 307,583 us-gaap_OperatingExpenses | 421,558 us-gaap_OperatingExpenses | 434,731 us-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 | 39,824 unl_NetOperatingExpenses | 36,108 unl_NetOperatingExpenses | 44,390 unl_NetOperatingExpenses | 58,355 unl_NetOperatingExpenses | 67,277 unl_NetOperatingExpenses | 64,600 unl_NetOperatingExpenses | 82,444 unl_NetOperatingExpenses | 106,657 unl_NetOperatingExpenses | 178,677 unl_NetOperatingExpenses | 320,978 unl_NetOperatingExpenses | 366,228 unl_NetOperatingExpenses
Net income (loss) | $ (4,714,528)us-gaap_NetIncomeLoss | $ (1,369,423)us-gaap_NetIncomeLoss | $ 15,362 us-gaap_NetIncomeLoss | $ 2,096,608 us-gaap_NetIncomeLoss | $ 2,383,547 us-gaap_NetIncomeLoss | $ (416,878)us-gaap_NetIncomeLoss | $ (2,953,211)us-gaap_NetIncomeLoss | $ 5,076,144 us-gaap_NetIncomeLoss | $ (3,971,981)us-gaap_NetIncomeLoss | $ 4,089,602 us-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 | $ 1.31 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.41 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ (0.30)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ (2.07)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 2.05 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ (4.63)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.09 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ (3.98)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax

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