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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Percentage of management fee in average daily total net assets	0.60%
Registration fees	$ 0	$ 0	$ 92,130
Estimated directors' fees and expenses	19,277	36,584	46,961
Licensing fee incurred	9,069	11,497	18,975
Investor tax reporting cost	175,285
USL and the Related Public Funds
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Estimated directors' fees and expenses	$ 916,574	1,210,000	1,258,000
Licensing Fees
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Fee percentage	0.015%
USL's
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Estimated directors' fees and expenses		36,584
Investor reporting costs		$ 66,664	$ 140,802

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Subparagraph (m)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-3

+ Details

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Balance Type:	debit
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
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(14))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

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X

- Definition

Amount of general expenses not normally included in Other Operating Costs and Expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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X

- Definition

Percentage of base fee.

+ 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.

+ Details

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Balance Type:	debit
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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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- Definition

Percentage of Management Fee In Average Daily Total Net Assets.

+ References

No definition available.

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- Details

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X

- Details

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