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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

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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

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

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- Details

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- Details

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