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v3.21.1

Balance Sheets (Parenthetical) - shares | Jan. 31, 2021 | Jan. 31, 2020
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Balance Sheets |  |
Certificate of beneficial interest of Land Trust, units | 13,120,010 | 13,120,010

X
- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
Name: | us-gaap_SharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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