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Note 3 - Recent Real Estate Transactions (Details Textual)					6 Months Ended		12 Months Ended
	Jul. 31, 2019 USD ($)	Jul. 01, 2019 USD ($)	May 08, 2019 USD ($)	Jan. 15, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Number of Real Estate Properties					132
Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total							$ 25,100,000
Gain (Loss) on Sale of Properties							$ 6,300,000
Morena Office Center [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total				$ 5,600,000
Gain (Loss) on Sale of Properties				$ 700,000
Number of Real Estate Properties				15
Nightingale Land [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total			$ 875,000
Gain (Loss) on Sale of Properties			$ (93,000)
Genesis Plaza [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total		$ 2,900,000
Sale of Percentage Interest in Real Estate Property		43.00%
Sale of Real Estate Property		$ 5,600,000
The Presidio [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total	$ 12,300,000
Gain (Loss) on Sale of Properties	$ 4,500,000
Model Home [Member]
Number of Real Estate Properties					17	18	33
Real Estate Property, Consideration Transferred, Total					$ 6,300,000	$ 6,100,000	$ 13,000,000
Model Home [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total					8,000,000	9,400,000	14,600,000	$ 12,600,000
Gain (Loss) on Sale of Properties					$ 557,000	$ 783,000	$ 1,200,000	$ 988,000
Number of Real Estate Properties					21	26	41	33
Port of San Diego Complex [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total								$ 24,800,000
Gain (Loss) on Sale of Properties								10,000,000
Yucca Valley Retail Center [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total								7,800,000
Gain (Loss) on Sale of Properties								1,400,000
Pacific Oaks Plaza [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total								3,900,000
Gain (Loss) on Sale of Properties								$ (232,000)

X

- Definition

Amount of consideration transferred for the purchase of real estate.

+ References

No definition available.

+ Details

Name:	sqft_RealEstatePropertyConsiderationTransferredTotal
Namespace Prefix:	sqft_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The percentage of interest in real estate property sold during the period.

+ References

No definition available.

+ Details

Name:	sqft_SaleOfPercentageInterestInRealEstateProperty
Namespace Prefix:	sqft_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of real estate property sold.

+ References

No definition available.

+ Details

Name:	sqft_SaleOfRealEstateProperty
Namespace Prefix:	sqft_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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 http://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 http://asc.fasb.org/extlink&oid=121586364&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 http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

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 http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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- Details

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- Details

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- Details

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- Details

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- Details

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