Represents the number of limited liability companies.

No definition available.

Name:	sqft_NumberOfLimitedLiabilityCompanies
Namespace Prefix:	sqft_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of limited partnerships in which the Company is the sole general partner.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of states in which real estate property is located.

+ References

No definition available.

+ Details

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Namespace Prefix:	sqft_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the aggregate percentage ownership by the reporting entity in the specified property.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of the property owned.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of tenants-in-common that own the specified real estate properties.

+ References

No definition available.

+ Details

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Namespace Prefix:	sqft_
Data Type:	xbrli:integerItemType
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Period Type:	instant

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
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-Paragraph 1
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-Subparagraph (SX 210.7-03(a)(2))
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The yearly payments due under the lease entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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-SubTopic 10
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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Name:	srt_MajorCustomersAxis=sqft_OneTenantMember
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Balance Type:
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Name:	srt_OwnershipAxis=sqft_NetREITPalmSelfStorageLPMember
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Name:	us-gaap_StatementBusinessSegmentsAxis=sqft_RetailPropertiesMember
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- Details

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Namespace Prefix:
Data Type:	na
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Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=sqft_IndustrialBuildingsMember
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Name:	dei_LegalEntityAxis=sqft_TenantInCommonOneMember
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Balance Type:
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Note 4 - Real Estate Assets (Details Textual)		12 Months Ended
Note 4 - Real Estate Assets (Details Textual)	Dec. 07, 2022 USD ($) a	Dec. 31, 2022 USD ($) a	Dec. 31, 2021 USD ($)
Number of States Real Estate Property is Located		3
Number of Limited Partnerships in which Company is Sole General Partner		5
Number of Limited Liability Companies		2
Restricted Cash, Total \| $		$ 4,400,000	$ 4,700,000
One Tenant [Member] \| Customer Concentration Risk [Member] \| Rental Income [Member]
Concentration Risk, Percentage		8.57%	8.00%
NetREIT Palm Self-Storage LP [Member]
Noncontrolling Interest, Ownership Percentage by Parent		61.30%
Retail Properties [Member]
Area of Real Estate Property (Acre)		65,242
Model Home [Member]
Number of Real Estate Properties		92
Number of Limited Partnerships in which Company is Sole General Partner		5
Number of Limited Liability Companies		1
Industrial Buildings [Member] \| Office/Industrial Properties [Member]
Number of Real Estate Properties		1
Office/Industrial Properties [Member]
Area of Real Estate Property (Acre)		756,265
Genesis Plaza [Member]
Real Estate Property, Number of Tenants-in-common Owning the Property		2
Percentage Beneficial Ownership in Property		76.40%
Genesis Plaza [Member] \| Tenant-in-common One [Member]
Percentage Ownership in Property		57.00%
Genesis Plaza [Member] \| Tenant-in-common Two [Member]
Percentage Ownership in Property		43.00%
Shea Center II [Member]
Area of Real Estate Property (Acre)		45,535
Restricted Cash, Total \| $		$ 1,100,000
Grand Pacific Center [Member]
Area of Real Estate Property (Acre)	33,296
Sale Leaseback Transaction, Annual Rental Payments \| $	$ 532,736
COLOMBIA
Number of Real Estate Properties		5
NORTH DAKOTA
Number of Real Estate Properties		4
SOUTH DAKOTA
Number of Real Estate Properties		1
TEXAS
Number of Real Estate Properties		1
MARYLAND
Number of Real Estate Properties		1