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Note 12 - Segments - Capital Expenditures by Reportable Segment (Details) - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Capital expenditures and tenant improvements | $ 1,001,836 | $ 832,990
Acquisition of operating properties | 12,932,128 | 4,646,330
Total real estate investments | 13,933,964 | 5,479,320
Office/Industrial Properties [Member] |  |
Capital expenditures and tenant improvements | 905,132 | 832,990
Acquisition of operating properties | 12,932,128 | 4,646,330
Model Home [Member] |  |
Acquisition of operating properties | 0 | 0
Retail Properties [Member] |  |
Capital expenditures and tenant improvements | 96,704 | 0
Acquisition of operating properties | $ 12,932,128 | $ 4,646,330

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: |
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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: |