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Note 6 - Other Assets (Details Textual)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
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