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Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Capital expenditures and tenant improvements | $ 319,737 | $ 100,765
Acquisition of operating properties | 2,427,890 | (0)
Total real estate investments | 2,747,627 | 100,765
Office/Industrial Properties [Member] |  |
Capital expenditures and tenant improvements | 319,737 | 100,765
Acquisition of operating properties | 2,427,890 | 0
Model Home [Member] |  |
Acquisition of operating properties | 0 | 0
Retail Properties [Member] |  |
Capital expenditures and tenant improvements | 0 | 0
Acquisition of operating properties | $ 2,427,890 | $ 0

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
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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=sqft_OfficeIndustrialPropertiesMember
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: |

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