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Note 6 - Other Assets (Details Textual)	Dec. 31, 2023 USD ($)
Number of Publicly Traded REITs in which Common Shares are Owned	3
Number of Publicly Traded REITs in which Options are Owned	0
Investments, Fair Value Disclosure	$ 45,149
Marketable Securities, Real Estate Investment Trust [Member] | Covered Call Option Contract [Member]
Derivative, Fair Value, Net	$ 0

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

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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
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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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X

- Details

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X

- Details

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