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

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
- 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: |