XML 21 R6.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Statements of Operations (Parenthetical) | Dec. 31, 2017
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ReceivedIn Kind Interest Percentage | 5.00%

X
- Definition The percentage of interest income received in kind of total interest received during the period. + References No definition available. + Details
Name: | unl_ReceivedinKindInterestPercentage
Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant