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Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Capital expenditures and tenant improvements	$ 1,122,051	$ 2,510,152
Acquisition of operating properties	7,758,066	8,996,248
Total real estate investments	8,880,117	11,506,400
Office/Industrial Properties [Member]
Capital expenditures and tenant improvements	1,054,202	2,501,075
Model Home Properties [Member]
Acquisition of operating properties	2,851,800	8,996,248
Retail Properties [Member]
Capital expenditures and tenant improvements	67,849	9,077
Acquisition of operating properties	$ 4,906,266

X

- Definition

The amount of real estate acquisitions and improvements.

+ References

No definition available.

+ Details

Name:	sqft_RealEstateAcquisitionsAndImprovements
Namespace Prefix:	sqft_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForTenantImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Details

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

X

- Details

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