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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS - Additional Information (Details) 1 - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fees Paid and Related Party Transactions [Line Items]
Percentage of Management Fee in Average Daily Total Net Assets	0.60%
Licensing fee incurred	$ 26,868	$ 27,019	$ 8,433
Investor tax reporting cost	269,000
Registration fees	151,475	124,835	0
Directors' fees and expenses	46,172	17,435	13,028
USL and the Related Public Funds, other than USCI, USAG, CPER and USMI
Fees Paid and Related Party Transactions [Line Items]
Directors' fees and expenses	$ 46,172	585,896	556,951
On and after October 20, 2011
Fees Paid and Related Party Transactions [Line Items]
Fee percentage	0.015%
USL's
Fees Paid and Related Party Transactions [Line Items]
Directors' fees and expenses	$ 1,081,963	17,435	13,028
Investor Reporting Costs		$ 171,801	$ 131,501

X

- Definition

Amount of registration fee expense for issuance of shares or units.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section 45
-Paragraph 3
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=124433917&loc=SL114874205-224268

+ Details

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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=120399700&loc=SL114874048-224260

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- 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=123367319&loc=SL114868664-224227

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X

- Definition

Base Fee Percentage

+ References

No definition available.

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- Definition

Fees Paid and Related Party Transactions [Line Items]

+ References

No definition available.

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- Definition

Represents investor reporting costs.

+ References

No definition available.

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X

- Definition

It represent the value of license fees and other offering expenses.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of Management Fee In Average Daily Total Net Assets.

+ References

No definition available.

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