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Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Capital expenditures and tenant improvements	$ 2,817,786	$ 1,939,712
Acquisition of operating properties	13,715,923	8,087,250
Total real estate investments	16,533,709	10,026,962
Office/Industrial Properties [Member]
Capital expenditures and tenant improvements	2,691,721	1,832,806
Acquisition of operating properties	13,715,923	8,087,250
Retail Properties [Member]
Capital expenditures and tenant improvements	126,065	106,906
Model Home [Member]
Acquisition of operating properties	$ 13,715,923	$ 8,087,250

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
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

+ 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:
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Balance Type:
Period Type:

X

- Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: