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Note 13 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Capital expenditures and tenant improvements	$ 2,834,373	$ 6,393,711
Acquisition of operating properties	10,161,613	13,037,562
Total real estate investments	12,995,986	19,431,273
Office/Industrial Properties [Member]
Capital expenditures and tenant improvements	2,825,168	6,373,464
Model Home Properties [Member]
Acquisition of operating properties	10,161,613	13,037,562
Retail Properties [Member]
Capital expenditures and tenant improvements	$ 9,205	$ 20,247

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

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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 http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

+ Details

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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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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: