XML 47 R32.htm IDEA: XBRL DOCUMENT
v3.22.0.1

FINANCIAL HIGHLIGHTS (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Per Share Operating Performance: |  |  |
Net asset value, beginning of year | $ 7.74 | $ 8.43 | $ 10.26
Total income (loss) | 4.01 | (0.62) | (1.74)
Total expenses | (0.10) | (0.07) | (0.09)
Net increase (decrease) in net asset value | 3.91 | (0.69) | (1.83)
Net asset value, end of year | $ 11.65 | $ 7.74 | $ 8.43
Total Return | 50.52% | (8.19%) | (17.84%)
Ratios to Average Net Assets |  |  |
Total income (loss) | 28.53% | (3.59%) | (17.87%)
Management fees | 0.75% | 0.75% | 0.75%
Total expenses excluding management fees | 1.28% | 1.41% | 1.86%
Expense waived | (1.13%) | (1.26%) | (1.71%)
Net expense excluding management fees | 0.15% | 0.15% | 0.15%
Net income (loss) | 27.63% | (4.49%) | (18.77%)

X
- Definition Average Net Assets [Abstract] + References No definition available. + Details
Name: | unl_AverageNetAssetsAbstract
Namespace Prefix: | unl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expense Excluding Management Fee Percentage Net + References No definition available. + Details
Name: | unl_ExpenseExcludingManagementFeePercentageNet
Namespace Prefix: | unl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expenses, Excluding Management Fee Percentage + References No definition available. + Details
Name: | unl_ExpensesExcludingManagementFeePercentage
Namespace Prefix: | unl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase (Decrease) In Net Asset Value Per Unit + References No definition available. + Details
Name: | unl_IncreaseDecreaseInNetAssetValuePerUnit
Namespace Prefix: | unl_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Management Incentive Fee Percentage + References No definition available. + Details
Name: | unl_ManagementIncentiveFeePercentage
Namespace Prefix: | unl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net asset value per unit. + References No definition available. + Details
Name: | unl_NetAssetValuePerUnit
Namespace Prefix: | unl_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of Consolidated Net Income + References No definition available. + Details
Name: | unl_PercentageOfConsolidatedNetIncome
Namespace Prefix: | unl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Total Revenue + References No definition available. + Details
Name: | unl_PercentageOfTotalRevenue
Namespace Prefix: | unl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Waiver Expense + References No definition available. + Details
Name: | unl_PercentageWaiverExpense
Namespace Prefix: | unl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate Of Return On Average Asset + References No definition available. + Details
Name: | unl_RateOfReturnOnAverageAsset
Namespace Prefix: | unl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total Expenses, Per Unit + References No definition available. + Details
Name: | unl_TotalExpensesPerUnit
Namespace Prefix: | unl_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total Income (Loss), Per Unit + References No definition available. + Details
Name: | unl_TotalIncomeLossPerUnit
Namespace Prefix: | unl_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInPartnersCapitalRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration