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Note 4 - Real Estate Assets (Details Textual)	3 Months Ended	12 Months Ended
	Mar. 31, 2021 ft²	Dec. 31, 2016	Mar. 31, 2020
Number of States Real Estate Property is Located	4
Number of Limited Partnerships in which Company is Sole General Partner		1
Number of Limited Liability Companies	2	4
Number of Real Estate Properties Held for Sale	3
Model Home [Member]
Number of Real Estate Properties	0		10
Number of Real Estate Properties Held for Sale	16
Office/Industrial Properties [Member]
Area of Real Estate Property (Square Foot)	867,744
Office/Industrial Properties [Member] | Industrial Buildings [Member]
Number of Real Estate Properties	1
Office/Industrial Properties [Member] | Office Buildings [Member]
Number of Real Estate Properties	9
Retail Properties [Member]
Number of Real Estate Properties	3
Area of Real Estate Property (Square Foot)	110,552
Model Home [Member]
Number of Real Estate Properties	106
Number of Limited Partnerships in which Company is Sole General Partner	6
Number of Limited Liability Companies	1
NORTH DAKOTA
Number of Real Estate Properties	4
SOUTH DAKOTA
Number of Real Estate Properties	2

X

- Definition

Represents the number of limited liability companies.

+ References

No definition available.

+ Details

Name:	sqft_NumberOfLimitedLiabilityCompanies
Namespace Prefix:	sqft_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of limited partnerships in which the Company is the sole general partner.

+ References

No definition available.

+ Details

Name:	sqft_NumberOfLimitedPartnershipsInWhichCompanyIsSoleGeneralPartner
Namespace Prefix:	sqft_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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

The number of states in which real estate property is located.

+ References

No definition available.

+ Details

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Namespace Prefix:	sqft_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
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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Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sqft_RetailPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sqft_ModelHomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_ND
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_SD
Namespace Prefix:
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