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Note 4 - Real Estate Assets (Details Textual)	Jun. 30, 2020
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: