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Condensed Statements of Financial Condition (USD $)
Mar. 31, 2015
Dec. 31, 2014
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 15,760,134us-gaap_CashAndCashEquivalentsAtCarryingValue $ 15,113,447us-gaap_CashAndCashEquivalentsAtCarryingValue
Equity in trading accounts:    
Cash and cash equivalents 5,231,739us-gaap_Cash 5,525,172us-gaap_Cash
Unrealized gain (loss) on open commodity futures contracts (3,944,865)unl_UnrealizedGainLossOnOpenCommodityFuturesContracts (4,919,890)unl_UnrealizedGainLossOnOpenCommodityFuturesContracts
Receivable for shares sold 0us-gaap_AccountsReceivableFromSecuritization 733,461us-gaap_AccountsReceivableFromSecuritization
Receivable from General Partner (Note 3) 17,835us-gaap_DueFromOfficersOrStockholders 66,266us-gaap_DueFromOfficersOrStockholders
Dividends receivable 247us-gaap_DividendsReceivable 247us-gaap_DividendsReceivable
Directors' fees and insurance receivable 2,254us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock 1,112us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock
ETF transaction fees receivable 0us-gaap_OtherReceivables 350us-gaap_OtherReceivables
Total assets 17,067,344us-gaap_Assets 16,520,165us-gaap_Assets
Liabilities and Partners' Capital    
General Partner management fees payable (Note 3) 11,124us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent 11,069us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent
Professional fees payable 50,053us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent 80,049us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
License fees payable 983unl_LicenseFeesPayableCurrentAndNoncurrent 998unl_LicenseFeesPayableCurrentAndNoncurrent
Brokerage commissions payable 1,581us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations 1,581us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations
Total liabilities 63,741us-gaap_Liabilities 93,697us-gaap_Liabilities
Commitments and Contingencies (Notes 3, 4 and 5)      
Partners' Capital    
General Partner 0us-gaap_GeneralPartnersCapitalAccount 0us-gaap_GeneralPartnersCapitalAccount
Limited Partners 17,003,603us-gaap_LimitedPartnersCapitalAccount 16,426,468us-gaap_LimitedPartnersCapitalAccount
Total Partners' Capital 17,003,603us-gaap_PartnersCapital 16,426,468us-gaap_PartnersCapital
Total liabilities and partners' capital $ 17,067,344us-gaap_LiabilitiesAndStockholdersEquity $ 16,520,165us-gaap_LiabilitiesAndStockholdersEquity
Limited Partners' shares outstanding 1,350,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 1,200,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Net asset value per share $ 12.60unl_NetAssetValuePerUnit $ 13.69unl_NetAssetValuePerUnit
Market value per share $ 12.61unl_MarketValuePerUnit $ 13.81unl_MarketValuePerUnit