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Note 13 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($)	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Capital expenditures and tenant improvements	$ 2,178,973	$ 1,939,641
Acquisition of operating properties, model home	9,444,465	9,729,351
Capital expenditures and tenant improvements	2,111,261	1,674,278
Total real estate investments	11,555,726	11,403,629
Office/Industrial Properties [Member] | Operating Segments [Member]
Capital expenditures and tenant improvements	2,111,261	1,462,957
Model Home Properties [Member] | Operating Segments [Member]
Acquisition of operating properties, model home	9,444,465	9,729,351
Retail Properties [Member] | Operating Segments [Member]
Capital expenditures and tenant improvements	$ 0	$ 211,321

X

- Definition

The amount of real estate acquisitions and improvements.

+ References

No definition available.

+ Details

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

X

- Definition

Net 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; for costs that are essential to originating the lease and would not otherwise have been incurred without the lease agreement, including but not limited to, evaluating the lessee's credit condition, guarantees, and collateral and costs incurred in negotiating, processing, and executing the lease agreement; and for any commission(s) incurred.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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

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

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X

- Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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Period Type: