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Note 1 - Organization (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)	May 11, 2022 USD ($)
Number of Limited Liability Companies	2
Number of Limited Partnerships in which Company is Sole General Partner	5
Future Principal Mortgage Notes Payables, Due	$ 4.4
Model Home Properties [Member]
Number of Limited Partnerships in which Company is Sole General Partner	5
Future Principal Mortgage Notes Payables, Due	$ 3.3
Commercial Property [Member]
Number of Real Estate Properties, Fee Simple	12
Commercial Property [Member] | Partially Owned Properties [Member]
Number of Real Estate Properties, Fee Simple	2
Mortgage Note, Due June 11, 2022 [Member] | The 300 N.P [Member]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid		$ 2.2

X

- Definition

The amount of future principal mortgage notes payables due.

+ References

No definition available.

+ Details

Name:	sqft_FuturePrincipalMortgageNotesPayablesDue
Namespace Prefix:	sqft_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the number of limited liability companies.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of limited partnerships in which the Company is the sole general partner.

+ References

No definition available.

+ Details

Name:	sqft_NumberOfLimitedPartnershipsInWhichCompanyIsSoleGeneralPartner
Namespace Prefix:	sqft_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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

X

- Definition

The number of real estate properties owned as of the statement of financial position to which the entity has fee simple title.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstatePropertiesFeeSimple
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sqft_ModelHomePropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=us-gaap_PartiallyOwnedPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=sqft_MortgageNoteDueJune112022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=sqft_The300NPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: