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Note 3 - Recent Real Estate Transactions (Details Textual) $ in Millions					3 Months Ended	6 Months Ended
	May 21, 2021 USD ($)	May 20, 2021 USD ($)	Feb. 19, 2021 USD ($)	Jan. 28, 2021 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Discontinued Operations, Disposed of by Sale [Member]
Number of Real Estate Properties						18	32
Proceeds from Sale of Real Estate						$ 10.0	$ 15.1
Gain (Loss) on Sale of Properties						$ 3.0	$ 2.3
Model Home [Member]
Number of Real Estate Properties						8	6
Real Estate Property, Consideration Transferred, Total						$ 4.6	$ 2.9
Payments to Acquire Residential Real Estate						1.4	0.9
Model Home [Member] | Mortgage Notes [Member]
Notes Payable, Total						$ 3.2	$ 2.0
Waterman Plaza [Member] | Discontinued Operations [Member]
Proceeds from Sale of Real Estate					$ 10.0
Gain (Loss) on Sale of Properties					$ (0.3)
Waterman Plaza [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate				$ 3.5
Gain (Loss) on Sale of Properties				$ (0.2)
Garden Gateway [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate			$ 11.2
Gain (Loss) on Sale of Properties			$ (1.4)
Highland Court [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate		$ 10.2
Gain (Loss) on Sale of Properties		$ (1.6)
Executive Office Park [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate	$ 8.1
Gain (Loss) on Sale of Properties	$ 2.5

X

- Definition

Amount of consideration transferred for the purchase of real estate.

+ References

No definition available.

+ Details

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Namespace Prefix:	sqft_
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X

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2443-110228

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X

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: 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))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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Name:	us-gaap_NotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cash outflow from the acquisition of residential property intended to generate income for the owner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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Balance Type:	credit
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X

- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585

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Balance Type:	debit
Period Type:	duration

X

- Details

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- Details

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- Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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