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Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Capital expenditures and tenant improvements, office	$ 6,663,116	$ 2,107,505
Acquisition of operating properties, model home	21,909,963	15,673,575
Total real estate investments	28,573,079	17,781,080
Operating Segments [Member]
Capital expenditures and tenant improvements, office	6,663,116	2,107,505
Office/Industrial Properties [Member]
Capital expenditures and tenant improvements, office	6,512,594	1,994,371
Acquisition of operating properties, model home	21,909,963	15,673,575
Retail Properties [Member]
Capital expenditures and tenant improvements, office	150,522	113,134
Model Home [Member]
Acquisition of operating properties, model home	$ 21,909,963	$ 15,673,575

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

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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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: