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Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Capital expenditures and tenant improvements	$ 319,737	$ 100,765
Acquisition of operating properties	2,427,890	(0)
Total real estate investments	2,747,627	100,765
Office/Industrial Properties [Member]
Capital expenditures and tenant improvements	319,737	100,765
Acquisition of operating properties	2,427,890	0
Model Home [Member]
Acquisition of operating properties	0	0
Retail Properties [Member]
Capital expenditures and tenant improvements	0	0
Acquisition of operating properties	$ 2,427,890	$ 0

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 https://asc.fasb.org/extlink&oid=126954810&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_ModelHomeMember
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: