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Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Capital expenditures and tenant improvements	$ 832,990	$ 332,508
Acquisition of operating properties	4,646,330	2,851,800
Total real estate investments	5,479,320	3,184,308
Office/Industrial Properties [Member]
Capital expenditures and tenant improvements	832,990	289,685
Acquisition of operating properties	4,646,330	2,851,800
Model Home [Member]
Acquisition of operating properties	0	0
Retail Properties [Member]
Capital expenditures and tenant improvements	0	42,823
Acquisition of operating properties	$ 4,646,330	$ 2,851,800

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

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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: