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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | 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 | $ 0 | $ 92,130 | $ 151,475 |
Estimated directors' fees and expenses | 36,584 | 46,961 | 46,172 |
Licensing fee incurred | 11,497 | 18,975 | 26,868 |
USL and other Related Public Funds |  |  |  |
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS |  |  |  |
Estimated directors' fees and expenses | $ 36,584 | 1,258,000 | 1,081,963 |
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 | $ 1,210,000 | 46,961 |  | $ 46,172
Investor tax reporting cost | $ 66,664 |  |  |
Investor reporting costs |  | $ 140,802 | $ 269,372 |

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- 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//1943274/2147483581/946-220-45-3 + Details
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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 -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//1943274/2147483589/942-220-S99-1 + Details
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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 -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 + Details
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- Definition Percentage of base fee. + References No definition available. + Details
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- Definition Fees Paid and Related Party Transactions [Line Items] + References No definition available. + Details
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- 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. + Details
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