Minimum fixed charge coverage ratio under the covenant of the debt instrument.

No definition available.

Name:	sqft_DebtInstrumentCovenantMinimumFixedChargeCoverageRatio
Namespace Prefix:	sqft_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of real estate properties held for sale.

+ References

No definition available.

+ Details

Name:	sqft_NumberOfRealEstatePropertiesHeldForSale
Namespace Prefix:	sqft_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Topic 835
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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
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+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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+ Details

Name:	us-gaap_LoansPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=sqft_RefinancedLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sqft_ConstructionLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=sqft_ModelHomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sqft_MortgageNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=sqft_GrandPacificCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 7 - Mortgage Notes Payable (Details Textual) $ in Millions	May 05, 2023 USD ($) ft²	Mar. 31, 2024 USD ($)	Aug. 05, 2023	Dec. 07, 2022 ft²
Refinanced Loan [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.35%
Debt Instrument, Face Amount	$ 3.8
Debt Instrument, Term (Year)	10 years
Construction Loan [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.35%
Debt Instrument, Face Amount	$ 2.7
Debt Instrument, Term (Year)	10 years
Loans Payable		$ 2.5
Model Home [Member]
Number of Real Estate Properties Held for Sale		11
Model Home [Member] \| Mortgage Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage			6.70%
Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio		1.1
Model Home [Member] \| Mortgage Notes [Member] \| Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage		2.68%
Model Home [Member] \| Mortgage Notes [Member] \| Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage		7.12%
Grand Pacific Center [Member]
Area of Real Estate Property (Acre) \| ft²	33,296			33,296