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CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions Merchant Agreements (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CONTRACTS AND AGREEMENTS
Total commissions accrued to brokers	$ 1,689	$ 2,187
Total commissions as annualized percentage of average total net assets	0.04%	0.04%

X

- Definition

The percentage of average daily net assets.

+ References

No definition available.

+ Details

Name:	unl_PercentageOfAverageDailyNetAssets
Namespace Prefix:	unl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees.

+ References

No definition available.

+ Details

Name:	us-gaap_FloorBrokerageExchangeAndClearanceFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration