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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2021
Fees Paid and Related Party Transactions [Line Items] |  |  |  |  |
Percentage of management fee in average daily total net assets |  |  | 0.60% |  |
Registration fees | $ 37,765 | $ 39,650 | $ 75,115 | $ 39,650 |
Estimated directors' fees and expenses | 13,800 | 4,780 | 19,330 | 7,902 |
Licensing fee incurred | $ 7,444 | $ 8,544 | $ 15,289 | $ 10,251 |
Scenario Forecast |  |  |  |  |
Fees Paid and Related Party Transactions [Line Items] |  |  |  |  |
Estimated directors' fees and expenses |  |  |  |  | $ 48,000
Investor tax reporting cost |  |  |  |  | 244,000
USL and the Related Public Funds, other than USCI, USAG, CPER and USMI | Scenario Forecast |  |  |  |  |
Fees Paid and Related Party Transactions [Line Items] |  |  |  |  |
Estimated directors' fees and expenses |  |  |  |  | $ 1,061,000
On and after October 20, 2011 |  |  |  |  |
Fees Paid and Related Party Transactions [Line Items] |  |  |  |  |
Fee percentage |  |  | 0.015% |  |

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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 http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + 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 -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=120395209&loc=SL114868664-224227 + Details
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- Definition Base Fee Percentage + 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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