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Note 6 - Other Assets (Details Textual) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Number of Publicly Traded REITs in which Common Shares are Owned | 17 |
Number of Publicly Traded REITs in which Options are Owned | 6 |
Marketable Securities, Total | $ 1,600,000 | $ 83,000
Number of Publicly Traded REITs in which Shares and Options are Owned | 2 |

X
- Definition Represents the number of publicly traded REITs in which the reporting entity owns common shares as of the specified date. + References No definition available. + Details
Name: | sqft_NumberOfPubliclyTradedREITSsInWhichCommonSharesAreOwned
Namespace Prefix: | sqft_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of publicly traded REITs in which the reporting entity owns options as of the specified date. + References No definition available. + Details
Name: | sqft_NumberOfPubliclyTradedREITsInWhichOptionsAreOwned
Namespace Prefix: | sqft_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of publicly traded REITs in which the reporting entity owns shares and options as of the specified date. + References No definition available. + Details
Name: | sqft_NumberOfPubliclyTradedREITsInWhichSharesAndOptionsAreOwned
Namespace Prefix: | sqft_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_MarketableSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant