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v3.22.4

Statements of Operations (Parenthetical) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Statements of Operations |  |  |
Interest income | 5.00% | 5.00% | 5.00%

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- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum percentage of paid in kind amount of interest income. + References No definition available. + Details
Name: | usl_InterestIncomeMaximumPercentageOfPaidInKind
Namespace Prefix: | usl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration