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Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Capital expenditures and tenant improvements | $ 2,817,786 | $ 1,939,712
Acquisition of operating properties | 13,715,923 | 8,087,250
Total real estate investments | 16,533,709 | 10,026,962
Office/Industrial Properties [Member] |  |
Capital expenditures and tenant improvements | 2,691,721 | 1,832,806
Acquisition of operating properties | 13,715,923 | 8,087,250
Retail Properties [Member] |  |
Capital expenditures and tenant improvements | 126,065 | 106,906
Model Home [Member] |  |
Acquisition of operating properties | $ 13,715,923 | $ 8,087,250

X
- Definition The amount of real estate acquisitions and improvements. + References No definition available. + Details
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Namespace Prefix: | sqft_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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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: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |