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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2022
Fees Paid and Related Party Transactions
Percentage of management fee in average daily total net assets			0.60%
Registration fees	$ 17,015	$ 38,180	$ 92,130	$ 113,295
Estimated directors' fees and expenses	11,478	13,576	35,691	32,906
Licensing fee incurred	$ 4,305	$ 6,124	$ 15,236	$ 21,413
Scenario Forecast
Fees Paid and Related Party Transactions
Estimated directors' fees and expenses					$ 49,000
Investor tax reporting cost					200,000
USL and the other Related Public Funds | Scenario Forecast
Fees Paid and Related Party Transactions
Estimated directors' fees and expenses					$ 1,258,000
On and after October 20, 2011
Fees Paid and Related Party Transactions
Fee percentage			0.015%

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 https://asc.fasb.org/extlink&oid=124433917&loc=SL114874205-224268

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- 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 https://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 https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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- Definition

Percentage of base fee.

+ References

No definition available.

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- Definition

Fees Paid and Related Party Transactions [Line Items]

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- Definition

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

+ References

No definition available.

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- Definition

Percentage of Management Fee In Average Daily Total Net Assets.

+ References

No definition available.

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