XML 21 R7.htm IDEA: XBRL DOCUMENT
v3.23.1

Condensed Statements of Operations (Parenthetical) | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Condensed Statements of Operations |  |
Interest income | 5.00% | 5.00%

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

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