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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Percentage of management fee in average daily total net assets	0.60%
Registration fees	$ 92,130	$ 151,475	$ 124,835
Estimated directors' fees and expenses	46,961	46,172	17,435
Licensing fee incurred	18,975	26,868	27,019
USL and the other Related Public Funds
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Estimated directors' fees and expenses	$ 46,961	1,081,963	585,896
On and after October 20, 2011
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	$ 1,258,000	46,172	17,435
Investor tax reporting cost	$ 140,802
Investor reporting costs		$ 269,327	$ 172,801

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

+ 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
-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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X

- 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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X

- Definition

Percentage of base fee.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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X

- Definition

Fees Paid and Related Party Transactions [Line Items]

+ References

No definition available.

+ Details

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- Definition

Represents investor reporting costs.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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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Balance Type:	debit
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- Definition

Percentage of Management Fee In Average Daily Total Net Assets.

+ References

No definition available.

+ Details

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- Details

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- Details

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