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v3.20.2

Note 4 - Real Estate Assets (Details Textual) | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Number of Real Estate Properties | 128 |
Number of Real Estate Properties Held for Sale | 4 |
Executive Office Park [Member] |  |
Number of Real Estate Properties | 4 |
Number of Real Estate Properties Held for Sale | 1 |
Model Home [Member] |  |
Number of Real Estate Properties | 25 | 18
Number of Real Estate Properties Held for Sale | 1 |

X
- Definition Represents the number of real estate properties held for sale. + References No definition available. + Details
Name: | sqft_NumberOfRealEstatePropertiesHeldForSale
Namespace Prefix: | sqft_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=sqft_ExecutiveOfficeParkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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