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Statements of Financial Condition (USD $)
Dec. 31, 2014
Dec. 31, 2013
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 15,113,447us-gaap_CashAndCashEquivalentsAtCarryingValue $ 25,514,584us-gaap_CashAndCashEquivalentsAtCarryingValue
Equity in trading accounts:    
Cash and cash equivalents 5,525,172us-gaap_Cash 949,087us-gaap_Cash
Unrealized gain (loss) on open commodity futures contracts (4,919,890)unl_UnrealizedGainLossOnOpenCommodityFuturesContracts 1,090,050unl_UnrealizedGainLossOnOpenCommodityFuturesContracts
Receivable for shares sold 733,461us-gaap_AccountsReceivableFromSecuritization 0us-gaap_AccountsReceivableFromSecuritization
Receivable from General Partner (Note 3) 66,266us-gaap_DueFromOfficersOrStockholders 100,580us-gaap_DueFromOfficersOrStockholders
Dividends receivable 247us-gaap_DividendsReceivable 672us-gaap_DividendsReceivable
Directors' fees and insurance receivable 1,112us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock 835us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock
ETF transaction fees receivable 350us-gaap_OtherReceivables 0us-gaap_OtherReceivables
Total assets 16,520,165us-gaap_Assets 27,655,808us-gaap_Assets
Liabilities and Partners' Capital    
General Partner management fees payable (Note 3) 11,069us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent 18,345us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent
Professional fees payable 80,049us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent 150,502us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
Brokerage commissions payable 1,581us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations 2,608us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations
License fees payable 998unl_LicenseFeesPayableCurrentAndNoncurrent 1,370unl_LicenseFeesPayableCurrentAndNoncurrent
Total liabilities 93,697us-gaap_Liabilities 172,825us-gaap_Liabilities
Commitments and Contingencies (Notes 3, 4 and 5)      
Partners' Capital    
General Partner 0us-gaap_GeneralPartnersCapitalAccount 0us-gaap_GeneralPartnersCapitalAccount
Limited Partners 16,426,468us-gaap_LimitedPartnersCapitalAccount 27,482,983us-gaap_LimitedPartnersCapitalAccount
Total Partners' Capital 16,426,468us-gaap_PartnersCapital 27,482,983us-gaap_PartnersCapital
Total liabilities and partners' capital $ 16,520,165us-gaap_LiabilitiesAndStockholdersEquity $ 27,655,808us-gaap_LiabilitiesAndStockholdersEquity
Limited Partners' shares outstanding 1,200,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 1,500,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Net asset value per share $ 13.69unl_NetAssetValuePerUnit $ 18.32unl_NetAssetValuePerUnit
Market value per share $ 13.81unl_MarketValuePerUnit $ 18.35unl_MarketValuePerUnit