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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) shares
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Unrecognized tax benefits accrued for interest and penalties	$ 0
Number of units per basket | shares	50,000
Transaction fee	$ 350

X

- Definition

Number of shares per basket.

+ References

No definition available.

+ Details

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Namespace Prefix:	unl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The sum of the amounts of transaction fee paid per order.

+ References

No definition available.

+ Details

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Namespace Prefix:	unl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319

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