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Statements of Operations (Parenthetical)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statements of Operations
Interest income	5.00%	5.00%	5.00%

X

- Definition

The maximum percentage of paid in kind amount of interest income.

+ References

No definition available.

+ Details

Name:	unl_InterestIncomeMaximumPercentageOfPaidInKind
Namespace Prefix:	unl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration