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Note 7 - Mortgage Notes Payable (Details Textual) | 6 Months Ended
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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
World Plaza [Member] |
Debt, Weighted Average Interest Rate | 4.40%
World Plaza [Member] | ABR [Member] |
Debt Instrument, Basis Spread on Variable Rate | 0.75%
World Plaza [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Debt Instrument, Basis Spread on Variable Rate | 2.75%
Model Home Properties [Member] | Minimum [Member] |
Debt Instrument, Interest Rate, Stated Percentage | 2.52%
Model Home Properties [Member] | Maximum [Member] |
Debt Instrument, Interest Rate, Stated Percentage | 5.63%
Waterman Plaza [Member] |
Debt Instrument, Floor Interest Rate | 4.25%
Waterman Plaza [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Debt Instrument, Basis Spread on Variable Rate | 3.00%

X
- Definition The floor interest rate under the debt agreement. + References No definition available. + Details
Name: | sqft_DebtInstrumentFloorInterestRate
Namespace Prefix: | sqft_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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 Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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: |

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

X
- Details
Name: | us-gaap_VariableRateAxis=sqft_AbrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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