XML 57 R41.htm IDEA: XBRL DOCUMENT
v3.21.1

Note 7 - Mortgage Notes Payable (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 02, 2020 | Dec. 31, 2019
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |
Number of Real Estate Properties |  | 46 | 4 | 41
Executive Office Park [Member] |  |  |  |
Number of Real Estate Properties |  | 4 |  |
Executive Office Park [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |
Number of Real Estate Properties |  | 1 | 1 |
Executive Office Park [Member] | Mortgage Notes [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | [1],[2] | 4.83% |  |
World Plaza [Member] | Mortgage Notes [Member] |  |  |  |
Debt, Weighted Average Interest Rate |  | 3.37% |  |
World Plaza [Member] | ABR [Member] | Mortgage Notes [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |
World Plaza [Member] | London Interbank Offered Rate (LIBOR) [Member] | Mortgage Notes [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.75% |  |
Waterman Plaza [Member] | Mortgage Notes [Member] |  |  |  |
Debt Instrument, Floor Interest Rate |  | 4.25% |  |
Waterman Plaza [Member] | London Interbank Offered Rate (LIBOR) [Member] | Mortgage Notes [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.00% |  |
Model Home [Member] |  |  |  |
Number of Real Estate Properties |  | 28 |  | 33
Model Home [Member] | Mortgage Notes [Member] | Minimum [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.50% |  |
Model Home [Member] | Mortgage Notes [Member] | Maximum [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.60% |  |
[1] | Interest rates as of December 31, 2020.
[2] | Properties held for sale as of December 31, 2020. Seven model homes were included as held for sale.

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 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
- 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: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfBySaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=sqft_MortgageNotesMember
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_WatermanPlazaMember
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_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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