XML 18 R27.htm IDEA: XBRL DOCUMENT
v3.20.1

FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Estimated directors fees and expenses |  |  |  |  |  |  |  |  | $ 1,096 | $ 1,447 | $ 1,929
Licensing fee incurred |  |  |  |  |  |  |  |  | 651 | 964 | 1,576
Expense waiver | $ 16,101 | $ 16,088 | $ 21,137 | $ 20,977 | $ 14,866 | $ 11,999 | $ 15,329 | $ 17,762 | $ 74,303 | 59,956 | 61,713
Licensing Agreements [Member] |  |  |  |  |  |  |  |  |  |  |
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Fee percentage |  |  |  |  |  |  |  |  | 0.015% |  |
Future Period - for the year ending December 31, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Estimated investor tax reporting cost |  |  |  |  |  |  |  |  | $ 77,834 | 65,000 | 72,000
Future Period - for the year ending December 31, 2019 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Costs and expenses annual limit for reimbursement |  |  |  |  |  |  |  |  | 0.15% |  |
UNL [Member] |  |  |  |  |  |  |  |  |  |  |
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Percentage of Contractual Obligated to Pay |  |  |  |  |  |  |  |  | 0.75% |  |
Estimated directors fees and expenses |  |  |  |  |  |  |  |  | $ 1,096 | 1,447 | 1,929
UNL [Member] | Related Public Funds [Member] |  |  |  |  |  |  |  |  |  |  |
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Estimated directors fees and expenses |  |  |  |  |  |  |  |  | $ 556,951 | $ 521,689 | $ 536,375

X
- Definition Base Fee Percentage + References No definition available. + Details
Name: | unl_BaseFeePercentage
Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expense Waiver + References No definition available. + Details
Name: | unl_ExpenseWaiver
Namespace Prefix: | unl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fees Paid and Related Party Transactions [Line Items] + References No definition available. + Details
Name: | unl_FeesPaidAndRelatedPartyTransactionsLineItems
Namespace Prefix: | unl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represent the value of license fees and other offering expenses. + References No definition available. + Details
Name: | unl_LicenseFeesAndOtherOfferingExpenses
Namespace Prefix: | unl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of Change in Costs and Expenses + References No definition available. + Details
Name: | unl_PercentageOfChangeInCostsAndExpenses
Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The information pertaining to percentage of contractual obligation pay. + References No definition available. + Details
Name: | unl_PercentageOfContractualObligatedToPay
Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
Name: | us-gaap_NoninterestExpenseDirectorsFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of general expenses not normally included in Other Operating Costs and Expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_OtherGeneralExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=us-gaap_LicensingAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_PeriodAxis=unl_FuturePeriodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_PeriodAxis=unl_UnitedStates12MonthNaturalGasFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=unl_RelatedPublicFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |