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Condensed Statements of Operations (Parenthetical)	Sep. 30, 2017
Maximum [Member]
Received In Kind Interest, Percentage	5.00%

X

- Definition

The percentage of interest income received in kind of total interest received during the period.

+ References

No definition available.

+ Details

Name:	unl_ReceivedInKindInterestPercentage
Namespace Prefix:	unl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: