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v3.20.1

SUBSEQUENT EVENTS (Details) - Subsequent Event - COVID-19 - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 22, 2020
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Subsequent Event [Line Items] |  |
Economic injury disaster loan |  | $ 10
Paycheck protection program loan | $ 462 |

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- Definition Proceeds From Debt Instrument To Be Forgiven + References No definition available. + Details
Name: | sqft_ProceedsFromDebtInstrumentToBeForgiven
Namespace Prefix: | sqft_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds From Notes Payable To Be Forgiven + References No definition available. + Details
Name: | sqft_ProceedsFromNotesPayableToBeForgiven
Namespace Prefix: | sqft_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=sqft_COVID19Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |