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v3.25.1

Consolidated Statements of Equity and Temporary Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statement of Stockholders' Equity [Abstract] |  |  |
Distributions | $ 2.4 | $ 2.4 | $ 2.4

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- Definition Distributions Per Share + References No definition available. + Details
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Namespace Prefix: | stsff_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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