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v2.4.1.9

Condensed Statements of Operations (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Gain (loss) on trading of commodity futures contracts: |  |
Realized gain (loss) on closed positions | $ (2,280,826)us-gaap_GainLossOnSaleOfInvestments | $ 1,641,740 us-gaap_GainLossOnSaleOfInvestments
Change in unrealized gain (loss) on open positions | 975,025 us-gaap_UnrealizedGainLossOnInvestments | 508,810 us-gaap_UnrealizedGainLossOnInvestments
Dividend income | 716 us-gaap_DividendIncomeOperating | 550 us-gaap_DividendIncomeOperating
Interest income | 635 us-gaap_InterestIncomeOperating | 713 us-gaap_InterestIncomeOperating
ETF transaction fees | 2,100 us-gaap_FeesAndCommissions | 3,150 us-gaap_FeesAndCommissions
Total income (loss) | (1,302,350)us-gaap_Revenues | 2,154,963 us-gaap_Revenues
Expenses |  |
General Partner management fees (Note 3) | 32,443 us-gaap_AssetManagementCosts | 44,676 us-gaap_AssetManagementCosts
Professional fees | 21,266 us-gaap_ProfessionalFees | 46,980 us-gaap_ProfessionalFees
Brokerage commissions | 1,595 us-gaap_FloorBrokerageExchangeAndClearanceFees | 2,070 us-gaap_FloorBrokerageExchangeAndClearanceFees
Directors' and insurance fees | 1,032 us-gaap_NoninterestExpenseDirectorsFees | 1,780 us-gaap_NoninterestExpenseDirectorsFees
License fees | 649 us-gaap_LicenseCosts | 894 us-gaap_LicenseCosts
Total expenses | 56,985 us-gaap_OperatingExpenses | 96,400 us-gaap_OperatingExpenses
Expense waiver (Note 3) | (17,835)unl_ExpenseWaiver | (38,045)unl_ExpenseWaiver
Net expenses | 39,150 unl_NetOperatingExpenses | 58,355 unl_NetOperatingExpenses
Net income (loss) | $ (1,341,500)us-gaap_NetIncomeLoss | $ 2,096,608 us-gaap_NetIncomeLoss
Net income (loss) per limited partnership share | $ (1.09)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.31 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Net income (loss) per weighted average limited partnership share | $ (1.02)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 1.69 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted
Weighted average limited partnership shares outstanding | 1,317,778 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding | 1,238,333 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding

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