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Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Capital expenditures and tenant improvements, office | $ 1,032,447 | $ 597,873
Acquisition of operating properties, model home | 2,238,497 | 5,039,455
Total real estate investments | 3,270,944 | 5,637,328
Operating Segments [Member] |  |
Capital expenditures and tenant improvements, office | 1,032,447 | 597,873
Office/Industrial Properties [Member] |  |
Capital expenditures and tenant improvements, office | 884,363 | 597,873
Acquisition of operating properties, model home | 2,238,497 | 5,039,455
Retail Properties [Member] |  |
Capital expenditures and tenant improvements, office | 148,084 | 0
Model Home [Member] |  |
Acquisition of operating properties, model home | $ 2,238,497 | $ 5,039,455

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
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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 -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
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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: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=sqft_RetailPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=sqft_ModelHomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |